The fluid-mosaic model of cell membranes refers to the discovery that membranes are composed
of a bilayer of phospholipids with proteins embedded; both phospholipids and proteins can easily
flip from inside to out (or vice versa), but cannot move laterally in the membrane.
O True
O False
Answers
Answer:
False
Explanation:
The fluid mosaic model describes the cell membrane as a tapestry of several types of molecules (phospholipids, cholesterols, and proteins) that are constantly moving.Membrane proteins and phospholipids are unable to move back and forth between the inner and outer leaflets of the membrane at an appreciable rate. However, because they are inserted into a fluid lipid bilayer,both are able to diffuse laterally through the membrane.
Individual phospholipids and proteins can rotate and move laterally within a bilayer.
Hope this helps!
Related Questions
can someone help with the question below would mean alot
Answers
Answer:
b hope this helps just took text edge
Explanation:
"Pitcher plants are carnivorous." Is it true or false?
Answers
Yes, it is true that pitcher plants are carnivorous. Pitcher plants are a type of carnivorous plant that have evolved to obtain essential nutrients from insects and other small organisms.
The answer in True.
These plants typically grow in nutrient-poor soil conditions and have adapted to capture and digest insects as a way to supplement their nutrient intake.
The main feature of pitcher plants is their modified leaves, which form a pitcher-like structure. This structure is filled with a liquid that contains enzymes and other substances that can break down the captured prey. The rim of the pitcher, called the peristome, is slippery, causing insects to fall into the trap. Once trapped, the insects are digested, and the nutrients are absorbed by the plant.
There are several types of pitcher plants, including the North American Sarracenia, the tropical Nepenthes, and the Cephalotus from Australia. Each species has unique adaptations and trapping mechanisms that help them capture different types of prey.
In summary, pitcher plants are indeed carnivorous, as they have adapted to obtain essential nutrients from insects and other small organisms. They do so through their unique pitcher-like structures, which are designed to trap and digest prey. This adaptation allows them to thrive in nutrient-poor soil conditions.
The answer in True.
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Adenosine Triphosphate is producer by which of the Organelles? A.Ribosomes B.Mitochondria C. lysosomes C. Gimmiesomes
Answers
Answer: mitochondria
Explanation:
Mitochondria is the power house of the cell which produces energy (Admeosine triphosphatealso called ATP) for the cell
Select the correct answer.
A family has a Y-linked disease that affects the father. What is the chance of a male offspring inheriting the same disease?
O A. 100%
B. 50%
OC. 25%
O D. 0%
Reset
Next
Answers
Answer:
A. 100%
Explanation:
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Which is a biotic factor?
Answers
Answer:
a living organism that shapes its environment
Explanation:
hope this helps
What is an autograph?
Answers
The definition of an autograph is the signature of a person written with his own hand, especially one written by someone well-known.
Answer: a signature, especially that of a celebrity written as a memento for an admirer
Explanation:
Question 33
Final exammm help plz
Answers
Answer:
B. decreasing the carbon dioxide level in the atmosphere
Explanation:
what are 2 examples of how ordinary citizins created significant social change
Answers
Civil Rights Movement and Women's Suffrage Movement are 2 examples of how ordinary citizens created significant social change.
Civil Rights Movement in the United States: The Civil Rights Movement of the 1950s and 1960s saw ordinary citizens, such as Rosa Parks, Martin Luther King Jr., and countless others, playing crucial roles in challenging racial segregation and discrimination. Through peaceful protests, civil disobedience, and grassroots activism, they brought attention to the injustices faced by African Americans and fought for equal rights, leading to significant changes in legislation and societal attitudes.
Women's Suffrage Movement: The women's suffrage movement fought for women's right to vote and brought about significant social change. Ordinary citizens, including suffragettes like Susan B. Anthony and Elizabeth Cady Stanton, organized rallies, protests, and campaigns to advocate for women's suffrage. Their persistent efforts, spanning several decades, eventually led to the passage of the 19th Amendment in 1920, granting women the right to vote in the United States.
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What are the stages of bee development (eggs,larvae,pupae)
Answers
The stages of bee development are egg, larva, pupa, and adult. Eggs hatch into larvae, which then transform into pupae. Finally, adult bees emerge and undergo further maturation.
The stages of bee development are:
1. Egg: The bee life cycle begins when the queen bee lays an egg in a honeycomb cell.
2. Larva: The egg hatches into a larva, which is a legless, grub-like creature. The larva is fed a special diet called royal jelly, which stimulates its growth.
3. Pupa: The larva undergoes metamorphosis and transforms into a pupa. Inside the sealed cell, the pupa undergoes various changes, developing into an adult bee.
4. Adult Bee: After completing the pupal stage, the fully developed adult bee emerges from the cell. The bee then undergoes further maturation, such as its exoskeleton hardening, wings expanding, and adult coloration appearing.
It's important to note that there are three castes of bees: queen, worker, and drone. The development process for each caste is similar, but the diet and size of the cells they are raised in differ, leading to their distinct roles within the colony.
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In recent years the elephant population in certain African ecosystems have seen a decreased. The decrease is most likely due tl
Answers
Answer:
mostly poaching
Explanation:
i dont know if this was the answer you wanted but...
nvm I had my head on the wrong question
Explain what traits you would give a pathogen if you wanted to make it hard for a vaccine to be used. List at least 4 things help please
Answers
Answer:
Here are four traits that would make it hard for a vaccine to be used:
1. Rapid mutation rate. If a pathogen mutates rapidly, it will be able to evade the immune system's defenses, including the antibodies produced by a vaccine. This is a particular problem with viruses, which can mutate very quickly.
2. Ability to evade the immune system. Some pathogens are able to evade the immune system by hiding inside cells or by changing their surface proteins so that they are no longer recognized by the immune system. This makes it difficult for the immune system to mount an effective response to the infection.
3. Ability to spread easily. If a pathogen is easily spread from person to person, it will be more difficult to prevent infection through vaccination. This is a particular problem with respiratory viruses, which can be spread through coughing and sneezing.
4. Lack of animal reservoirs. If a pathogen does not have animal reservoirs, it will be more difficult to develop a vaccine against it. This is because vaccines are typically developed using weakened or killed versions of the pathogen. If there are no animal reservoirs, there will be no source of the pathogen to use for vaccine development.
It is important to note that these are just a few of the traits that can make it difficult to develop a vaccine against a pathogen. There are many other factors that can contribute to the difficulty of vaccine development, such as the cost of vaccine development, the availability of funding, and the political will to support vaccine development.
1) What were the main lessons you learned about living things?
2) What were the main lessons you learned about nonliving things?
3) Is there any interrelationship between living and nonliving things?
4) What is the name given to the science that is concerned with the study a
living things?
Answers
StMary's a good day for me and you are the kids going ❤️❤️ a good time☺️☺️
Answer:
Im not sure
Explanation:
Im not sure because there could be many different answers
Which was Charles Darwin’s contribution to the study of biology?
He was the first person to recognize that organisms change over time.
He believed that organisms adapted through the inheritance of acquired traits.
He explained how traits are passed from parents to offspring.
He proposed that natural selection is the primary mechanism of evolution.
Answers
Answer:
d
Explanation:
Charles Darwin proposed that natural selection is the primary mechanism of evolution. The correct option is D.
What is natural selection?Natural selection is the method by which living organism populations adapt and change.
Individuals in a population are innately variable, which means they diverge in the some ways. This variation indicates that some people have traits that are better adapted to their surroundings than others.
Natural selection, Darwin proposed, is a mechanism for evolution in which heritable traits that help support life reproduce and survive are becoming more prevalent in a population over time.
Natural selection occurs when genes that confer a survival or reproductive advantage are handed down and persist in a population, whereas genes that result in lower survival or fewer offspring are becoming less common.
Thus, the correct option is A.
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Base your answers to questions 1 through 3 on the diagram below and on your knowledge
of Earth science. The diagram represents the expansion of a portion of the universe from its
origin until the present. The timeline represents billions of years. Letter X indicates two
celestial objects.
Timeline (billion years ago)
Present T
5-
10-
Origin of
Universe
15-
1. Two pieces of evidence that support the theory that the universe is expanding are the
A) red shift of light from distant stars and the existence of nuclear fusion
B) red shift of light from distant stars and the existence of cosmic background
radiation
C) blue shift of light from distant stars and the existence of nuclear fusion
D) blue shift of light from distant stars and the existence of cosmic background
radiation
polestial objects labeled X are
Answers
The two pieces of evidence that support the theory of the expanding universe are the red shift of light from distant stars and the existence of cosmic background radiation.
The correct answer is option B.
1. Red shift of light from distant stars: The observation of redshift in the light coming from distant galaxies provides evidence for the expansion of the universe. Redshift occurs when the light waves from an object moving away from an observer are stretched, causing a shift towards longer wavelengths. This phenomenon is consistent with the Doppler effect, where the wavelength of light appears to stretch as the source moves away. The redshift of light from distant stars indicates that galaxies are moving away from us and from each other, supporting the idea that the universe is expanding.
2. Existence of cosmic background radiation: The discovery of cosmic background radiation further supports the theory of the expanding universe. Cosmic background radiation is a faint, uniform microwave radiation that permeates the entire universe. It is believed to be residual radiation from the Big Bang, the initial event that is thought to have initiated the expansion of the universe. The presence of cosmic background radiation provides strong evidence for the hot, dense early stages of the universe and its subsequent expansion.
Based on the information provided in the diagram, it is not possible to determine the identity or nature of the celestial objects labeled X. The diagram only represents the expansion of the universe over time and does not provide specific details about individual celestial objects.
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Explain why it’s important for the cell membrane to be fluid
Answers
Answer:
Cell membrane is fluid because individual phospholipid molecules and proteins can diffuse within their monolayer and thus move around.
Explanation:
Riya went to Lulu and found the display of fruits grown locally and also fruits imported from Austria. Which of these do you think is healthier for Riya? justify
Answers
Answer:
The fruit grown locally
chambers A and B are placed next to each other but are separated by a film permeable to both glucose and fructose. chambers A contain 80% glucose and 60%fructose and chamber B contains 20% glucose and 40^ fructose .which of the following will occur 1. glucose and fructose will move into the chamber B at the same rate 2.glucose move into chamber B faster than fructose 3.glucose will fructose move faster into chamber A at the same rate 4. fructose will move move into chamber B faster than glucose 5. active transport of glucose from the blood to the dialysis solution
Answers
Answer:
2.glucose move into chamber B faster than fructose
Explanation:
Facilitated diffusion: refers to the transport of hydrophilic molecules that are not able to freely cross the membrane. Channel protein and many carrier proteins are in charge of this passive transport. If uncharged molecules need to be carried this process depends on concentration gradients and molecules are transported from a higher concentration side to a lower concentration side. If ions need to be transported this process depends on an electrochemical gradient. The glucose is an example of a hydrophilic protein that gets into the cell by facilitated diffusion. Facilitated diffusion is a passive transport process because the cell does not need any energy to make it happen.The exposed scenario is an example of facilitated diffusion, a process that occurs in favor of the concentration gradient, and which rate depends on the concentration of molecules in each side of the membrane, in this case, glucose and fructose, among other factors that might also influence the diffusion rate. So, as the concentration of glucose is higher in chamber A (80%), and lower in chamber B (20%), in comparison with fructose, the first one will diffuse faster than fructose. The difference in concentration between both chambers is sharper in glucose, so its transport is faster than the fructose transport, which will also diffuse but at a lower rate.
which theory states that living things change slowly over time in response to their environment
Answers
Under conditions when a cell only needs to use the nonoxidative portion of the Pentose Phosphate Pathway to synthesize ribose-5-phosphate, the elevated levels of NADPH in the cell will inhibit which of the following enyzymes?
A) Glucose 6-phosphate dehydrogenase
B) Transaldolase
C) Transketolase
D) Glucose 6-phosphatase
E) Alpha ketogluterate dehydrogenase
Answers
Answer:
A) Glucose 6-phosphate dehydrogenase is inhibited by elevated levels of NADPH in the cell when a cell only needs to use the nonoxidative portion of the Pentose Phosphate Pathway to synthesize ribose-5-phosphate.
Fill in the blanks
Nebulae are____ where____ can form.
Dust and gas
Stars
Light
Gravity
Plants
SOMEONE HELP!
Answers
Nebulae are Dust and gas where Stars can form, hence option A, B.
How is nebula formed?Although there are less than ten atoms per cubic meter in intergalactic space, it is not completely vacuum. Nature, after all, detests emptiness! When a few atoms are close enough to one another to clump together, a nebula starts to form. Naturally, the gravitational influence of atoms increases with the number of clumps they form. Eventually, a sizable gaseous cloud forms in space as a result of them being able to drag even more particles toward them.
A nebula is primarily a cloud of gas and dust in space; when there are several, they are collectively referred to as nebulae. Some of the most beautiful celestial phenomena are nebulae, and many of them have been given names that refer to things we are familiar with, like the land.
Therefore, option A, B are correct.
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2 Itching and other skin problems are signs that a cat or dog may have fl eas. Fleas are parasites known for their biting and blood-sucking abilities. When they bite, fl ea saliva enters the pet’s circulatory system, sometimes causing an allergic response commonly seen as a “hot spot” on the pet’s neck or the base of its tail
Answers
Itching and other skin problems are signs that a cat or dog may have flea. Fleas are parasites known for their biting and blood-sucking abilities. When they bite, flea saliva enters the pet’s circulatory system, sometimes causing an allergic response commonly seen as a “hot spot” on the pet’s neck or the base of its tail.
Fleas are tiny parasitic insects that infest the fur of dogs and cats. They feed on blood and cause skin irritation that results in itching. If the problem is severe, it can lead to more significant health issues. Pet owners should watch for signs of fleas and treat their pets promptly to avoid complications. Fleas lay eggs on the skin of dogs and cats, which hatch and develop into larvae.
The larvae feed on the skin, shedding as they mature. Adult fleas emerge from the larvae, biting the host to feed on blood. The process repeats itself, with adult fleas continuing to lay eggs on the skin of the pet.The most common sign of fleas in dogs and cats is itching. Pets will often scratch themselves, bite their skin, or lick excessively to relieve the irritation.
Other signs of fleas include red or inflamed skin, hair loss, and the appearance of small, raised bumps on the skin. These bumps are often referred to as "flea dirt" and are the waste products of the fleas. In severe cases, anemia, an allergic reaction, or the transmission of other parasites or diseases can occur.
Flea infestations can be treated with a variety of products, including topical treatments, shampoos, and collars. It is essential to follow the instructions on the product label and treat the pet and the surrounding environment to eliminate the fleas. Prevention is key to avoiding flea infestations, so pet owners should maintain a regular grooming and flea prevention schedule.
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question on picture for biology
Answers
Answer:
because doctors can determine your family's risk from your ariments
Explanation:
hope this helps
Answer:
First one I think
effect of late night eating
Answers
Answer: Eating late at night can lead to several health hazards like increase in blood sugar levels, heart diseases, obesity and acidity. Basically, the later you eat, the less your body is prepared to sleep, which can also have adverse effects on your memory and efficiency for the next day
Discuss how crossing over leads to greater variability of phenotypes. Give an example to help explain your answer.
Answers
Answer:
During meiosis, the process of cell division that occurs in the production of gametes (eggs and sperm cells), there is a process called crossing over that occurs. This process involves the exchange of genetic material between homologous chromosomes.
Crossing over leads to greater variability of phenotypes because it allows for the mixing and shuffling of genetic material between chromosomes, resulting in the production of gametes with new combinations of genetic information. These new combinations of genetic information can result in the expression of different traits and characteristics, leading to greater variability among offspring.
For example, consider a plant with red flowers and a plant with white flowers that are both homozygous for their respective flower color. If these plants produce gametes through meiosis and crossing over occurs between the chromosomes responsible for flower color, the offspring of these plants may have a variety of different flower colors, such as pink or coral, due to the mixing and shuffling of genetic material that occurred during crossing over. This increased variability in flower color is a result of crossing over leading to the production of gametes with new combinations of genetic information.
Explanation:
Which of the following was most likely responsible for the fact that organic molecules no longer spontaneously form on Earth?
The amount of UV radiation increased.
The amount of oxygen in the atmosphere increased.
Water accumulated in the oceans.
Earth's surface temperature warmed.
Answers
Answer: The amount of oxygen in the atmosphere increased.
Which statement describes the law of segregation?
A. When two alleles are inherited but only one is expressed, the
expressed allele is dominant.
B. The two alleles of a gene separate dyring gamete formation.
C. A specific combination of the versions of a gene determines
which allele is expressed.
D. The alleles from different genes are sorted separately.
Answers
Answer:
C. A specific combination of the versions of a gene determines
Answer:
B.
Explanation:
The two alleles of a gene seperate during gamete formation
characteristics of contaminated water
Answers
Contaminated water is a type of water that is harmful to human beings due to the presence of harmful substances, pollutants, or impurities that make the water unsafe for drinking or other household uses. The characteristics of contaminated water can be identified through various indicators, which can either be physical, biological or chemical.
Physical indicators are visible and may include color, taste, and odor, while biological indicators are not visible and may include bacteria, viruses, and protozoa. Chemical indicators may include heavy metals, pesticides, and organic compounds, among others.
Physical Characteristics: Physical characteristics of contaminated water include cloudy or turbid appearance, unusual taste or odor, or discoloration of the water. The color may range from yellow to brown, blue to green, or even black.
Biological Characteristics: Biological characteristics of contaminated water include the presence of bacteria, viruses, or protozoa. These microorganisms can cause diseases such as diarrhea, typhoid, cholera, and dysentery.
Chemical Characteristics: Chemical characteristics of contaminated water include the presence of heavy metals such as lead, arsenic, or cadmium. Pesticides and fertilizers can also contaminate water and affect human health. Organic compounds like benzene and toluene can also be present in contaminated water, which can lead to health problems such as cancer and nerve damage.
Therefore, it is important to test water sources regularly to identify and monitor any contaminants that may be present. This can help prevent health problems associated with the use of contaminated water.
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what is occurring during the mitosis phase
Answers
Answer:
During mitosis, a eukaryotic cell undergoes a carefully coordinated nuclear division that results in the formation of two genetically identical daughter cells. ... Then, at a critical point during interphase (called the S phase), the cell duplicates its chromosomes and ensures its systems are ready for cell division.
Explanation:
1 What does the codon sequence on the mRNA strand determine?
A The gene sequence of the DNA
B The amino acid sequence of the polypeptide
C The codon that is signaled
D The signaling sequence
2 What portion of the DNA is also known as a gene?
A The coding sections
B The non-coding sections
C The mRNA strand
D The polypeptide sequence
Answers
1. The correct answer is B.
2. The correct answer is A.
The codon sequence on the mRNA strand determines the amino acid sequence of the polypeptide.
The coding section is the portion of the DNA that is also known as a gene. Genes are the functional units of DNA that provide the instructions for making proteins. They are composed of coding cells, also known as exons, that contain the information needed to build the polypeptide, and non-coding sections, also known as introns, that do not.
The codon sequence on the mRNA strand is translated by the ribosome during protein synthesis. Each codon, which is a sequence of three nucleotides, corresponds to a specific amino acid. The ribosome reads the codon sequence on the mRNA strand and adds the corresponding amino acids to the growing polypeptide chain. This process is called translation.
In DNA, genetic information is encoded in the sequence of nucleotides, which are the building blocks of DNA. Genes are specific segments of DNA that contain the instructions for making a specific protein. These instructions are encoded in the sequence of nucleotides within the coding sections of the DNA, also known as exons. The non-coding sections, also known as introns, do not contain instructions for making proteins, but they play important roles in the regulation of gene expression.
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Name one geographic region that has few or no fossil primates and explain why.
Answers
Answer:
Australia
Explanation:
Fossils are preserved remains (or mouldings) of ancient living things which are preserved in sedimentary rocks. Primate fossils are generally found along with other fossils, usually in ancient soils that contain information on the conditions under which they were formed. Primate fossils are generally found in tropical and subtropical regions (which represent the natural habitat in which these species live). Primates never lived in Australia, and therefore no fossil primates from this geographic area have been found.