the placement of the operator sequence between the promotor and the structural genes is critical to the proper function of the lac operon. view available hint(s)for part c the placement of the operator sequence between the promotor and the structural genes is critical to the proper function of the lac operon. true false
Answers
True - The structural genes cannot be translated by RNA polymerase when the repressor binds to the operator.
Several repressors permit RNA polymerase to attach to the promoter simultaneously, but they obstruct the succeeding steps of the initiation process, ultimately preventing transcription start.
The operator gene attaches to the repressor, which stops it from starting the synthesis of the protein required by the operon. The operon is either turned on or off depending on the presence or absence of specific repressor molecules.
High tryptophan levels allow the trp repressor to transform into its active (DNA-binding) form by binding to it. In order to prevent RNA polymerase from attaching to the promoter and stopping transcription of the operon, the tryptophan-bound trp repressor connects to the operator.
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Related Questions
Please can you guys help I’ve been stuck on this for 10 mins
Answers
Answer:
Hi,
Red blood cells free in blood / not supported by other cells so cholesterol helps to maintain shape.
Hope this helps
What is the species number of protista?
Answers
I’m am small scale.
And I have scales.
I am an unusual reptile.
..That is, I have winged limbs.
What am I?
Answers
Answer:
I think it is the Draco lizard, buy I am not 100% sure
Explanation:
in chickens, the dominant allele cr produces the creeper phenotype (having extremely short legs). however, the creeper allele is lethal in the homozygous condition. the homozygous recessive genotype results in a normal individual. if two creepers are mated, what will be the phenotypic ratio among the living offspring? 1 normal : 1 creeper 3 creepers : 1 normal 3 normal : 1 creeper 2 creepers : 1 normal 2 normal : 1 creeper
Answers
If two creepers are mated, the phenotypic ratio among the living offspring will be 2 normal : 1 creeper. This is because both creepers are homozygous dominant for the cr allele, so all of their offspring will inherit one copy of the cr allele.
However, as the creeper allele is lethal in the homozygous condition, any offspring that inherit two copies of the cr allele will not survive. Therefore, the only surviving offspring will be those that inherit one copy of the cr allele and one copy of the normal allele from their parents. These offspring will have the creeper phenotype, but will not be homozygous for the lethal creeper allele, allowing them to survive. The ratio of normal to creeper offspring will be 2:1 because there is a 1 in 4 chance of each offspring inheriting two copies of the normal allele, which will result in a normal phenotype. The other 3 in 4 chance will result in offspring with one copy of the normal allele and one copy of the cr allele, giving them the creeper phenotype. Therefore, the phenotypic ratio among the living offspring of two creepers will be 2 normal : 1 creeper.
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Layer
Question
Epidermis
(outer layer)
General function?
Why is it water resistant?
Function of the stratum layers?
Role of Melanocytes and melanin?
Function of Merkel cells?
Dermis Layer
(middle layer)
What is it composed of?
How does the dermis help with thermoregulation?
How do sweat glands help with thermoregulation?
Role of blood vessels in the dermis?
Role of nerves in the dermis layer?
Hypodermis
(inner layer)
What is it composed of?
What are its primary functions?
Answers
Answer: It protects your body from harm, keeps your body hydrated, produces new skin cells, and contains melanin, which determines the color of your skin.
The stratum corneum is the outermost layer of the epidermis and is composed of dead scale-like cells that become progressively flattened and joined together. In addition, the outer skin, or epidermis contains a strong protein called keratin. Keratin is insoluble in water, making this layer waterproof. The outermost layer of the epidermis (stratum corneum) holds in water and keeps your skin hydrated and healthy. Melanocyte is a highly differentiated cell that produces pigment melanin inside melanosomes. This cell is dark and dendritic in shape. Melanin production is the basic function of melanocytes. With the process of differentiation, this cell loses proliferative potential. A special type of cell is found right below the epidermis (top layer of skin). These cells are very close to the nerve endings that receive the sensation of touch and may be involved in touch. The cells also contain substances that may act as hormones.
The dermis is divided into two layers: the papillary dermis and the reticular dermis. It consists of collagen fibers, fibroblast cells, fat cells, blood vessels (capillary loops), nerve fibers, touch receptors (Meissner corpuscles), and cells that fight bacteria (phagocytes). The blood vessels of the dermis provide nutrients to the skin and help regulate body temperature. Heat makes the blood vessels enlarge (dilate), allowing large amounts of blood to circulate near the skin surface, where the heat can be released. Cold makes the blood vessels narrow (constrict), retaining the body's heat. The eccrine sweat gland, which is controlled by the sympathetic nervous system, regulates body temperature. When the internal temperature rises, the eccrine glands secrete water to the skin surface, where heat is removed by evaporation. The blood vessels in the dermis are crucial for the maintenance of the epidermis and epidermal appendages. Nutrients via blood support the epidermis, hair follicles, and sweat glands. Feeling different sensations: Nerve endings in your dermis allow you to feel different sensations, like pressure, pain, heat, cold, and itchiness. Producing sweat: Your dermis contains sweat glands, which produce sweat when you're hot or experience stress. Sweat helps control your body temperature (thermoregulation). The hypodermis layer includes Adipose tissue: Adipose tissue is a fatty tissue that consists mostly of adipocytes. Blood vessels: Blood vessels include arteries, capillaries, and veins. They circulate blood throughout your body, help deliver oxygen to vital organs, and remove waste products. The hypodermis is the bottom layer of skin in your body. It has many important functions, including storing energy, connecting the dermis layer of your skin to your muscles and bones, insulating your body, and protecting your body from harm.
Due to the action of tears, potential pathogens of the eyes and its membranes usually end up where?
Answers
Potential pathogens of the eyes and its membranes typically end up in the stomach as a result of the action of tears.
Through a network of ducts and canals, tears (and the pathogen they collect) enter the nose where they mix with nasal mucus before entering the pharynx where they are swallowed and eventually end up in the stomach. The pathogens end up in the stomach and there they are acted upon by the enzymes of the stomach as well as the acidic environment of stomach. The bacterial cell wall is broken by the enzymes of the stomach and the acidic environment and lysozyme also help in destroying the bacteria.
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How has technology such as telescopes, satellites, computers, and GPS units affect the scope of scientific discovery?
Answers
Answer:ghhjhjhkjhkjkjhkhExplanatio
How does this connect to the horizontal collisions we performed? Be specific.
Answers
The concept of momentum conservation connects to the horizontal collisions we performed. The same principle applies to all types of collisions, including vertical collisions or collisions on an incline. In all cases, the total momentum of the objects involved in the collision is conserved.
During our horizontal collisions experiment, we observed that when two objects collided, their momentum was conserved. This means that the total momentum of the objects before the collision was equal to the total momentum of the objects after the collision. This principle is known as the law of conservation of momentum. This is an important concept in physics, as it helps us to understand the behavior of objects in motion and to make predictions about their future movements.
In horizontal collisions, objects collide with each other along a straight, horizontal plane. During these collisions, the total momentum of the objects is conserved, meaning that the total momentum before the collision is equal to the total momentum after the collision. The conservation of momentum and energy transfer during horizontal collisions can be better understood by examining the specific details of the collision, such as the masses of the objects, their velocities before and after the collision, and the types of collision (elastic or inelastic). By analyzing these factors, you can determine how momentum and energy are transferred between objects and how this connects to the horizontal collisions you performed.
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What is the function of the endoplasmic reticulum in a cell?
A.converting energy from food into a form the cell can use
B.assembling lipids, proteins, and other materials for export out of the cell
C.providing a barrier between the cell and its surroundings
D.packaging proteins and other materials from the endoplasmic reticulum for storage in the cell or transport out of the cell
Answers
Answer:
B its main function is to make proteins and lipids
As you may have realized, carbon-14 cannot be used to date our oldest fossils, because it has all decayed by the time we find them. To date our oldest fossils, we need to use both absolute and relative dating. We look for layers of volcanic ash that contain the radioactive isotope Potassium-40. This element has a half life of 1.25 billion years! Let’s say you’re a geologist, and in your sample you determine there to be 3.125% Potassium-40 left. What would the approximate age of that ask layer be?
Answers
The approximate age of the volcanic ash layer is approximately 6.25 billion years.
The approximate age of the volcanic ash layer containing Potassium-40 can use the concept of half-life and the percentage of Potassium-40 remaining.
Given that Potassium-40 has a half-life of 1.25 billion years, it means that after every 1.25 billion years half of the original amount of Potassium-40 decays.
Let's calculate the number of half-lives that have occurred based on the remaining percentage of Potassium-40:
Remaining percentage = 3.125%
Let's assume the initial amount of Potassium-40 was 100%.
After one half-life, the remaining percentage would be 50%.
After two half-lives, the remaining percentage would be 25%.
After three half-lives, the remaining percentage would be 12.5%.
After four half-lives, the remaining percentage would be 6.25%.
After five half-lives, the remaining percentage would be 3.125%.
Since the remaining percentage matches the given value of 3.125% can conclude that approximately five half-lives have occurred.
Since each half-life of Potassium-40 is 1.25 billion years, the approximate age of the volcanic ash layer can be calculated by multiplying the half-life by the number of half-lives:
Approximate age = 1.25 billion years/half-life × 5 half-lives
= 6.25 billion years
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What are the functions of guard cells?
Answers
Guard cells control the opening and closing of the stomata in plant cells.
WHAT ARE GUARD CELLS:Guard cells are structures that surrounds the stomata of plant cells and regulates the opening and closing of the stomata. The stomata, which are located on the leaves of plants opens in order for the plant to perform gaseous exchange i.e. intake of CO2 and release of O2.Therefore, Guard cells function to control the opening and closing of the stomata in plant cells.
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b. nuclear______occurs in star's
core that combines elements to make
BIGGER elements.
Answers
Answer:
nuclear fussion occurs in star's core that combines elements to make BIGGER elements.
Explanation:
Hope this helps :)
describe some conditions in which the body has a deficiency or excess of water or an improper distribution of water among the fluid compartments.
Answers
Dehydration is a common condition where the body experiences a water deficiency.
Dehydration can result from various factors, such as excessive sweating, vomiting, diarrhea, & inadequate fluid intake. Symptoms of dehydration include thirst, dry mouth, fatigue, headache, & dizziness. In severe cases, dehydration can lead to shock, kidney failure, & even death.
On the other side, a condition known as water intoxication or hyponatremia can result from an abundance of water in the body. It happens when the body absorbs more water than it can eliminate, causing sodium and other electrolytes to dilute in the blood.
For best health, the body's water balance must be properly maintained. Imbalances including dehydration, water intoxication, and edoema can cause a variety of health problems, from minor discomfort to potentially fatal circumstances.
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Susan has been assigned to build a model of a plant cell. She has many materials to help her build her model: plastic wrap, a plastic sandwich
bag, aluminum foil, different kinds of dry pasta, stiff cardboard, and pipe cleaners.
She selects the stiff cardboard to represent which outside supporting part of the plant cell?
O A. cell membrane
O B. mitochondria
O c. cell wall
D. nucleus
E. vacuole
HELP!
Answers
i believe the answer is c, cell wall^^
Cell wall supporting part of the plant cell. So, the correct option is C.
What is Cell wall?A cell wall is defined as the structural layer surrounding certain types of cells present outside the cell membrane which can be rigid, flexible and sometimes rigid. The cell wall provides both structural support and protection to the cell which serves as a filtering mechanism.
Cell wall present only in plants and some fungi, bacteria and algae. The plant cell wall is arranged in 3 layers which are composed of carbohydrates, such as pectin, cellulose, hemicellulose and other small amounts of minerals, which form a network with structural proteins to form the cell wall.
Thus, Cell wall supporting part of the plant cell. So, the correct option is C.
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90% of energy is lost as what?
Answers
Answer:
Notice that at each level of the food chain, about 90% of the energy is lost in the form of heat. The total energy passed from one level to the next is only about one-tenth of the energy received from the previous organism.
Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level. A food chain can usually sustain no more than six energy transfers before all the energy is used up.
This mutant dna sequence is the result of a blank (transition or transversion?) mutation. the effect of this base substitution on the amino acid sequence results in a blank mutation.
Answers
Base substitutions in amino acids lead to point mutations.
What are point mutations?
When the alteration of a single base pair of DNA leads to a change in the gene, it is called a point mutation.
They are commonly seen and are a result of mistakes that occurred in DNA structure during its replication. Point mutations can be induced by physical agents like radiations. Examples of two of the commonly known radiations that induce point mutations are X-rays and Ultraviolet rays.
Point mutations are either transitional or transversional.
When a pyrimidine switches for a pyrimidine or when a purine switches for purine, it's called a transitional mutation. When a purine switch for pyrimidine and vice versa, it's called a transversional mutation.Therefore, base substitutions in amino acids lead to point mutations.
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What type of growth is shown in the graph?
A) Exponential growth
B) logistic growth
C) carrying capacity
D) growth rate
Answers
Answer:
A
Explanation:
Cause I know the soul never dies
I make the chrome-chrome fly
I'm a wave, Roll Tide
Bullets at your face, bow tie
My persona done got her tongue tied
I was taught that a legend never dies
When it's time gotta let the lead fly
'Cause I'm a war-war-war baby
Post-traumatic stress I know the war changed me
Had to bend back but they could never break me
Had to slide
We was hoppin' out in broad day
Serving fiends in the hallway
Promethazine 'til the morningggg
what effect does the sun have on the skin to cause cancer
Answers
Answer:
Too much UV radiation from the sun or sunbeds can damage the genetic material (the DNA) in your skin cells. If enough DNA damage builds up over time, it can cause cells to start growing out of control, which can lead to skin cancer. Melanin protects skin from the sun's ultraviolet rays, which can burn the skin, and over time, could reduce its elasticity and cause a person to age prematurely. Suntanning occurs because exposure to sunlight causes the skin to produce more melanin and to darken.May
Explanation:
(Brainliest plz?)
Well the effect that the sun has on the skin to cause cancer is UV radiation,and in that process the sun damages genetic matter in your skin cells (DNA).And with that happening your cells (DNA) begin to (overgrow) in size and causes skin cancer.
why does sexual reproduction result in more genetic variation in a species
a) it mixes the chromosome of the two parents
b) it increases the chromosome number
c) it increases the number of genes in each organism
d) it produces haploid organisms
Answers
It mixes the chromosomes of the two parents. Therefore, option (A) is correct.
Sexual reproduction involves the fusion of genetic material from two parent organisms, typically through the combination of their gametes (sperm and egg). Each parent contributes a unique set of chromosomes to the offspring, resulting in a mixing or recombination of genetic material.
This process introduces new combinations of alleles (variations of genes) that were present in the parents, leading to increased genetic diversity in the offspring. By shuffling and recombining genetic information, sexual reproduction allows for the creation of novel gene combinations, increasing the potential for variation within a species.
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any body looking for a freind
Answers
Answer:
meee lol I need friends <3
Me. =.= .................................
Why might waterfront realtors be concerned with the health of riparian zones?
Answers
Answer:
Health riparian zones are important to waterfront realtors developers because these zones help to increase property values,they cause a reduction in property loss which can be as a result of erosion, they reduce the amount of water pollution by improving the quality of healthy water and they enhance habitats for wildlife.
Explanation:
Waterfront realtors are real estate agents or developers that develop or build land properties on river or water.
The riparian zone is the interface between land and water. Waterfront realtors are concerned about the riparian zones because it reduces loss of property which can be cause of erosion, increase property values and so on.
Answer:
Waterfront realtors are real estate agents or developers that develop or build land properties on river or water.
The riparian zone is the interface between land and water. Waterfront realtors are concerned about the riparian zones because it reduces loss of property which can be cause of erosion, increase property values and so on.
Explanation:
The type of fibers specialized to continue contracting for extended periods of time, as would be required in running a marathon, for example, are _____ fibers.
Answers
The type of fibers specialized to continue contracting for extended periods of time, as would be required in running a marathon, for example, are slow fibers.
Slow fibers have numerous mitochondria that allow you to obtain large amounts of energy aerobically.
Its contraction speed is slow, providing it with high resistance to fatigue, thus maintaining exercise for hours, typical of endurance sports (marathon).They are able to retain a longer duration of exercise at a more constant pace. These fibers are important for endurance triathletes, those who compete in medium and long distance.Therefore, we can conclude that the type of fibers specialized to continue contracting for extended periods of time, as would be required in running a marathon, for example, are slow fibers.
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multimodal texts examples,definition,sentence,types
Answers
Multimodal texts are a type of communication that includes more than one method of expression. It could be visual, audio, or written in the text. This could mean a lot of things, including text with pictures, videos, or even a combination of all three.
Multimodal texts could be the best option for people who don't like to read traditional books, or for those who want to learn in a more dynamic and interactive way. Multimodal texts encourage engagement, and it can help with cognitive processing, which makes them an excellent educational tool for schools. A few examples of multimodal texts include video games, memes, infographics, and slideshows.
Multimodal texts can help enhance literacy, engagement, and accessibility. Multimodal texts can be used in all sorts of contexts, from teaching children to helping adults learn a new language. They are an excellent resource for anyone who wants to learn something new, no matter what their learning style may be.
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QUESTIONS.
What is your opinion about the origin of life?
What theories do you know about it?
How much do you know about the Big Bang theory?
Answers
Answer:
Answer down below!
Explanation:
What is your opinion about the origin of life? As a Christian, I think that all humans started with Adam and Eve!
What theories do you know about it? The Bible is a great place to start!
How much do you know about the Big Bang theory? Uhm...nothing ;v;
Answer:
I'm a Christian so I believe it came from GOD making Adam and eve than they had children and so on. I don't really know any theories. The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now (and it could still be stretching).
highest form in the Hierarchy of Life
Answers
Explanation:
The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.Aug 14, 2020
A boy picks up an earthworm and place it on a white tile. He observed that the earthworm has difficulty in moving forward.
Explain why.
Answers
Answer:
A number of tiny hair like bristlez are present on the lower surface pf an earthworm's body. These bristles help it to get a good grip on the surface of q ground.However these bristles donot provide good grip on plain glass tiles.
Earthworms have microscopic hairs or bristles all over their body which provide the necessary traction while movement. These bristles or setae are present on each segment of their body and it imparts the necessary grip or anchorage for forward and backward movement.
Tile is smooth in nature so earthworms cannot move as the setae will not get sufficient surface support to move the body.
Answer From Gauth Math
D. dependent variable: Bean plants idai indragobe
If you drink caffeine, will you be more tired than if you did not drink caffeine?
A. control group:
B. experimental group:
C. independent variable:
D. dependent variable:
hot of or
τ.-...….
class size on student achievement?
Answers
If you drink caffeine, will you be more tired than if you did not drink caffeine is an example of dependent variable.
What is a variable in science?A variable is a factor that can be manipulated, changed or controlled while performing scientific experiments.Variables are of 3 types: independent, dependent and controlled variables.A dependent variable is the one that changes as a result of manipulating independent variable in experiments.Independent variable consists of conditions that can be manipulated in experiments and thus affect the dependent variables.A control group is the one which is used as a standard while performing the experiments. This group contains the normal data to which no manipulations are made.An experimental group is the one to which we perform experiments. This group receives the treatment and is used to test a hypothesis.Learn more about variables here:
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When a certain bacterium encounters the antibiotic tetracycline, the antibiotic molecule enters the cell and attaches to a repressor protein. This keeps the repressor from binding to the bacterial chromosome and allowing a set of genes to be transcribed. These genes code for enzymes that break down the antibiotic. This set of genes is best described as __________.
Answers
When a certain bacterium encounters the antibiotic tetracycline, the set of genes that is described as an operon helps to break down the antibiotic.
This operon is known as an inducible operon because the presence of tetracycline triggers the transcription of the operon genes. These genes encode enzymes that can break down tetracycline molecules. The inducible operon is composed of the repressor gene, the operator gene, and the structural genes.
The repressor protein of the inducible operon attaches to the operator gene to prevent the transcription of the structural genes. When tetracycline enters the cell, the antibiotic molecule binds to the repressor protein, which alters its shape and prevents it from binding to the operator.
The operator region is free to interact with RNA polymerase, which initiates the transcription of the structural genes that code for the enzymes required to break down tetracycline. Thus, the inducible operon plays an important role in regulating the expression of genes that respond to the presence of specific molecules.
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8) a general rule relating the capacity of a specific animal's digestive system to provide adequate access to substrates for biosynthesis of cellular components, as well as fuel molecules needed for atp production, is that the animal should have access to
Answers
A general rule relating to the capacity of a specific animal's digestive system to provide adequate access to substrates for the biosynthesis of cellular components is that D) the diet matches the "food pyramid" for the species.
In the field of biology, a food pyramid determines the optimal levels of a particular serving that an organism needs to eat in order to fulfill the required nutrition level.
It is only when the diet matches the food pyramid that an animal's digestive system will be able to provide substrates that are required for the biosynthesis of cellular components. These substrates are derived from the energy of the food.
When the diet matched the food pyramid, then there will be the required nutrition available needed for the production of ATP molecules.
Although a part of your question is missing, you might be referring to this question:
A general rule relating the capacity of a specific animal's digestive system to provide adequate access to substrates for biosynthesis of cellular components, as well as fuel molecules needed for ATP production, is that the animal should have access to
A) a high-protein, low-carbohydrate diet.
B) a diet low in lipids and high in protein.
C) a low-calorie diet with a large intake of fluids, especially water.
D) a diet that matches the "food pyramid" for the species.
E) a diet that maximizes vitamins and minerals.
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Which plant hormone(s) increases leaf size
Answers
Answer:
Gibberellin
Explanation:
I've studied that gibberellin is a plant hormone that promotes cell elongation and division, causing the cells in the leaves to elongate and divide more, this leads to an increase in leaf size.
Hope it helps! :)
The plant hormone that helps in increasing the leaf size is the phytohormone Auxin .
Plants create signalling molecules called plant hormones, which are found in low concentration. All plant's growth and progression are regulated by plant hormones.
There are basically five types of plant hormones that are considered to be essential for plant growth . They are Auxin , Cytokinin , Gibberellin , ABA , Ethylene .
The Cytokinin and Auxin work together to enhance the development of leaf as both of the phytohormones are responsible to modulate the growth of leaf as well as controlling the cell cycle . These hormones are considered essential for plant growth and it occur naturally at various concentrations within plants throughout the duration .
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