the sev rtk is expressed in more cell types than just r7 precursor cells, and it appears to be important in determining the phenotypes of these other cells. explain how one receptor can induce different phenotypes in different cell types.
Answers
A Receptor Tyrosine Kinase (RTK) called Sevenless (Sev) is necessary for the Drosophila photoreceptor to be specified.
Another RTK, the Drosophila EGF Receptor, acts to specify additional Drosophila photoreceptors (DER). It has been unknown for a long time why Sev is necessary only in the R7 precursor and what precise function it serves in determining the fate of the cell. One of the many functions of Notch (N) signalling in R7 specification is to stop DER activity from deciding the fate of the photoreceptor. According to our current understanding of Sev function, in order to get around the N-imposed restriction on photoreceptor specificity, Sev hyperactivates the RTK pathway in the R7 precursor. This viewpoint assumes that DER and Sev both activate the same transduction system, with the main distinction between them being the degree of pathway activation they cause. We created a Sev/DER chimaera to test this model.
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Related Questions
the mixture of food and gastric juice that enters the duodenum is called: group of answer choices mucosa chyme gastrin bolus
Answers
: chyme
- why? chyme, a thick semifluid mass of partially digested food and digestive secretions that is formed in the stomach and intestine during digestion.
True or false: autosomes are sex chromosomes
Answers
Answer:
True is your answer
Explanation:
An autosome is any of the numbered chromosomes, as opposed to the sex chromosomes. Humans have 22 pairs of autosomes and one pair of sex chromosomes (the X and Y). ... That is, Chromosome 1 has approximately 2,800 genes, while chromosome 22 has approximately 750 genes
Answer:
Its true!
Explaination:
What symbol is used to designate an absolute cell reference?.
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Hello there
which of the following statements are true for human erythrocytes? 1. oxygen diffuses through the phospholipid bilayer. 2. sodium ions diffuse through the phospholipid bilayer. 3. water passes in and out of these cells by osmosis. a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2 and 3
Answers
The cell membrane's phospholipid bilayer allows oxygen molecules to move through it. This is because oxygen is a little, nonpolar particle. The correct answer is (A).
Red blood cells, or RBCs, are the erythrocytes. RBCs that are mature and in circulation do not have a nucleus.
The blood transports nearly 70% of carbon dioxide as bicarbonate, 20-25% as bound RBCs, and approximately 7% as dissolved plasma. However, RBCs (as bound to hemoglobin) transport nearly 97% of oxygen, while plasma transports the remaining 3% in a dissolved state.
Biconcave, anucleate, and bright red, erythrocytes lack a nucleus. They are adept at maneuvering the circulatory system due to their concave, smooth, and pliable nature. Hemoglobin is a protein found in red blood cells. Each of the four subunits that make up hemoglobin contains a heme group.
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which marine zone would have the lowest rates of primary productivity (photosynthesis)?
Answers
The marine zone that would have the lowest rates of primary productivity (photosynthesis) would be the aphotic zone.
The aphotic zone, also known as the midnight zone or the dark zone, is the part of the ocean that receives little to no sunlight. It is typically found at depths of 1,000 meters (3,300 feet) or more. Because there is no sunlight in this zone, there is no photosynthesis occurring and therefore no primary productivity. This means that there are no plants or algae producing oxygen and organic compounds, which are essential for the survival of other organisms. As a result, the aphotic zone is home to a limited number of species, most of which are adapted to survive in low-light conditions.
In contrast, the photic zone, which is the uppermost layer of the ocean that receives sunlight, has the highest rates of primary productivity. This is because photosynthesis can occur in this zone, allowing for the production of oxygen and organic compounds. The photic zone is home to a wide variety of marine plants and animals, including phytoplankton, seaweed, and coral reefs. In conclusion, the aphotic zone has the lowest rates of primary productivity due to its lack of sunlight, while the photic zone has the highest rates of primary productivity because it receives an abundance of sunlight.
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Which of the following would be considered biologically important free radicals? Select all that apply
O2
NO2
NO
Answers
The biologically important free radicals are: NO (Nitric oxide). So the correct option is C.
NO (nitric oxide) is considered a biologically important free radical. It is a highly reactive molecule that acts as a signaling molecule in many physiological processes in the body, including regulation of blood vessel dilation, immune response, and neurotransmission. It is involved in various cellular signaling pathways and plays a role in regulating numerous physiological and pathological processes in the body.
O2 (oxygen) and NO2 (nitrogen dioxide) are not considered biologically important free radicals. Oxygen (O2) is a stable molecule that is essential for respiration and energy production in cells, while nitrogen dioxide (NO2) is a toxic air pollutant that can be harmful to human health when present in high concentrations. Free radicals are highly reactive molecules that have an unpaired electron, and they can damage cellular structures and biomolecules if not properly regulated by antioxidant systems in the body.
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the evolution of jointed appendages has made __________ very successful.
Answers
The evolution of jointed appendages has made arthropods very successful. Arthropods are the most species-rich and abundant animal phylum, accounting for more than 80 percent of the world's species.
Arthropods have segmented bodies with jointed limbs and a tough exoskeleton made of chitin, which offers structural support and protection against predators. This adaptation has given them significant advantages in the ecosystem, and they have evolved into numerous specialized forms to occupy diverse habitats and ecological niches.
The development of jointed appendages has provided arthropods with several advantages, including enhanced mobility and agility, more precise movement, and an increased capacity to interact with their surroundings. The appendages have allowed arthropods to exploit a wide range of habitats and niches, from burrowing in soil to swimming in water, to flying in the air.
Insects, for example, are capable of hovering, rapid changes in direction, and even complete turns, enabling them to navigate complex environments and avoid obstacles. Arthropod success can also be attributed to their ability to molt, allowing them to grow and regenerate damaged or lost appendages, as well as their adaptable physiology and behavior.
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which is an example of a changing biotic factor in an ecosystem?group of answer choicesan increase in the usual amount of winter snowfallan increase in sunlight during the summerseasonal migration of monarch butterfliesseasonal changes in temperature
Answers
An increase in sunlight during the summer is an example of a changing biotic factor in an ecosystem.
An ecosystem is made up of all the species and their physical surroundings. The nutrition cycles and energy flows connect these biotic and abiotic elements. Photosynthesis is how energy enters the system and is absorbed by plant tissue. Animals play a significant part in the transfer of materials and energy through the system by eating plants and one another.
They also have an impact on the biomass levels of the microbial and plant communities. In addition to facilitating nutrient cycling by transforming nutrients held in dead biomass back into a form that can be easily utilized by plants and microorganisms, decomposers also release carbon into the atmosphere through the breakdown of dead organic matter.
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In both prokaryotes and eukaryotes, how many copies of the chromosome are left after replication?.
Answers
Only two copies of chromosomes are left in both prokaryotes and eukaryotes after replicatio
when i went to the park i saw a lot of trash on the ground. i don't think it's good for animals to have so much pollution in their?
A. biology
B. genetic variation
C. organism
D. population
E. species
F. environment
G. offspring
H. overproduction
i. reproduction
D.
Answers
Answer: F. Environment
Explanation:
The environment that the animals live in is special and once destroyed, it cannot be promised to be fully and potentially restored. The environment they live in is obviously polluted and should be cleaned.
How is cross-pollination carried out in nature?
A. Cross-pollination occurs when pollen is transferred to the stigma
of the same flower.
B. Cross-pollination occurs with the help of pollinators, like bees or
birds.
C. Cross-pollination does not occur in nature.
Answers
Answer:
B. Cross-pollination occurs with the help of pollinators, like bees or
birds.
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Which of the following statements correctly supports the conclusion that eukaryotic cells are more complex than prokaryotic cells?
A. only eukaryotic cells contain ribosomes
B. Only eukaryotic cells can be seen using a microscope
C. Only eukaryotic cells contain membrane bound organelles
D. Only eukaryotic cells contain DNA and RNA
Answers
60 minutes remaining
Question 13 The most abundant photoreceptors that detect dim light are Cones.
A True
B False
Question 14 Muscular tissue that adjusts the shape of the pupil to regulate how much light enters the eye is IRIS.
A True
B False Question
15 Opsins are visual pigments derived from Vitamin D.
A True
B False
Answers
Answer:
Question 13:
B. False
The most abundant photoreceptors that detect dim light are Rods, not Cones. Rods are highly sensitive to low light conditions and are responsible for vision in dim light and peripheral vision. Cones, on the other hand, are responsible for color vision and high visual acuity but are less sensitive to low light conditions.
Question 14:
A. True
The iris is the muscular tissue in the eye that adjusts the size of the pupil, controlling the amount of light entering the eye. It contracts or expands to regulate the size of the pupil in response to changing light conditions.
Question 15:
B. False
Opsins are visual pigments found in photoreceptor cells, specifically in the retina of the eye. They are responsible for capturing light and initiating the process of vision. Opsins are not derived from Vitamin D. Vitamin D is a separate compound involved in various physiological processes in the body, including calcium absorption and bone health.
Explanation:
26. Evolutionary relationships can be used to answer what kinds of questions?
Answers
Answer:
To build phylogenetic trees, scientists must collect character information that allows them to make evolutionary connections between organisms. Using morphologic and molecular data, scientists work to identify homologous characteristics and genes.
Explanation:
What alternative energy resource could be harmful to the environment
which we live in?
Answers
Answer:
Fossil fuels—coal, oil, and natural gas—do substantially more harm than renewable energy sources by most measures, including air and water pollution, damage to public health, wildlife and habitat loss, water use, land use, and global warming emissions.
Explanation:
the steps of the action potential when potassium channels open and potassium rushes out of the cell, is called: g
Answers
When potassium channels open and potassium rushes out of the cell, it triggers a hyperpolarization phase in the action potential.
When potassium channels open and potassium rushes out of the cell, it triggers a hyperpolarization phase in the action potential. This occurs after the depolarization phase, where sodium channels open and sodium rushes into the cell. During the hyperpolarization phase, the membrane potential becomes more negative than the resting potential, making it less likely for the neuron to fire again. This is due to the high concentration of potassium ions outside the cell and the low concentration inside, creating an electrochemical gradient that drives potassium out of the cell. The steps of this process involve the opening of potassium channels, the movement of potassium ions down their concentration gradient, and the restoration of the resting membrane potential.
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What factors differentiate Earth's atmospheric layers?
A. Pressure and Rate of condensation
B. Radiation deflection and Rate of condensation
C. Temperature and Pressure
D. Temperature and Radiation deflection
Plz help
Answers
Answer:
What factors differentiate Earth's atmospheric layers?
A. Pressure and Rate of condensation
B. Radiation deflection and Rate of condensation
C. Temperature and Pressure
D. Temperature and Radiation deflectionWhat do mitochondria make?
Answers
Answer:
It produces energy for the cell. That energy is called ATP or adenosine triphosphate
Explanation:
Answer:
Mitochondria are membrane bound cell organelles mitochondrion singular that generate most of the chemical energy needed to power the cell's biochemical reactions Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate ATP
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One form of the disease adrenoleukodystrophy (ALD) is caused by the substitution of serine for asparagine in the ALD protein. List the possible single-nucleotide alterations in the DNA of the ALD gene that could cause this genetic disease.
The codons for ________ are AAU and AAC and mutation of the 2nd residue in these codons to a __________ yields codons for serine.
Please fill in the blanks!
Answers
The codons for Asparagine are AAU and AAC and mutation of the 2nd residue in these codons to a cytosine (C) yields codons for serine. One form of the disease adrenoleukodystrophy (ALD) is caused by the substitution of serine for asparagine in the ALD protein.
The single-nucleotide alterations in the DNA of the ALD gene that could cause this genetic disease are: AAC (Asn) to AGC (Ser)AAC (Asn) to AGU (Ser)AAU (Asn) to ACU (Ser)AAU (Asn) to AGU (Ser)The genetic disease adrenoleukodystrophy (ALD) is X-linked and it is characterized by damage to the myelin sheath of nerve cells in the brain and nervous system. The substitution of serine for asparagine in the ALD protein is caused by a point mutation, in which a single nucleotide base is altered.
This results in a codon that codes for serine instead of asparagine. The mutations listed above result in the same substitution of serine for asparagine and cause ALD.
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3.) What is the difference
between chemical and
physical properties?
Answers
Explanation:
Chemical properties are when the ability of a substance undergoes a specific chemical change. Examples include burning, rotting, exploding, and decomposing.
Physical properties are when a substance can be observed or measured without changing the identity of the substance. Examples include color, density, and melting points.
In the year 2500, five male space colonists and five female space colonists (all unrelated to each other) settle on an uninhabited Earthlike planet in the Andromeda galaxy. The colonists and their offspring randomly mate for generations. All ten of the original colonists had free earlobes, and two were heterozygous for that trait. The allele for free earlobes is dominant to the allele for attached earlobes. If one assumes that Hardy-Weinberg equilibrium applies to the population of colonists on this planet, about how many people will have attached earlobes when the planet's population reaches 10,000
Answers
Answer:
100 individuals will have attached earlobes out of a population of 10000
Explanation:
From the Hardy-Weinberg equilibrium; p² + 2pq + q². Also, p + q = 1
p² = population of individuals breeding true for free earlobes
2pq = population of individuals heterozygous for free earlobes
q² = population of individuals breeding true for attached earlobes
p = frequency of dominant allele
q = frequency of recessive allele
The dominant trait is free earlobes while the recessive trait is attached earlobes.
Eight out of ten are breed-true for free earlobes, whereas, two were heterozygous for that trait.
p² = 8/10 = 0.8
p = 0.89 or approximately 0.9
q = 1 - p
q = 1 - 0.9
q = 0.1
q² = (0.1)²
q² = 0.01
For a population of 10000 persons, number of people with attached earlobes will be:
0.01 * 10000 = 100 persons
Therefore, 100 individuals will have attached earlobes out of a population of 10000
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Traits can be_________ which means they can be seen and are capable of masking a different trait.
Traits can also be __________ which means they can be masked.
Answers
Recessive
Basic biology! Good luck
Answer:
✔ one allele
✔ each parent
✔ dominant
✔ recessive
✔ gene
Explanation:
Mendelian inheritance states that traits are determined when offspring receive
✔ one allele
for each trait from
✔ each parent
.
Traits can be
✔ dominant
, which means they can be seen and are capable of masking a different trait.
Traits can also be
✔ recessive
, which means they can be masked.
Alleles are different versions of the same
✔ gene
in an organism.
which patient finding indicates effective treatment of atrial fibrillation with dabigatran
Answers
Atrial fibrillation and Dabigratan are two medical terminologies that are related to the cardiovascular system.
Atrial fibrillation is the most prevalent cardiac arrhythmia and is caused by the chaotic electrical activity of the atrial tissue. On the other hand, Dabigratan is an oral anticoagulant that is used to reduce the risk of stroke and blood clots in people with atrial fibrillation.
Now, let us proceed to the patient finding that indicates effective treatment of atrial fibrillation with Dabigratan. A patient's international normalized ratio (INR) is a measure of the degree of anticoagulation achieved by oral anticoagulant therapy such as warfarin. For patients receiving dabigatran, an INR value does not need to be checked or monitored, because dabigatran does not have the same impact on clotting factors that warfarin does.
Therefore, a patient's INR level is a finding that indicates the effectiveness of the treatment of atrial fibrillation with dabigatran.
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snake,grass hopper,grab,spider from the above organisms formulate a dichotomous key
Answers
Does it have legs? (Yes/No)
Yes: Go to 2
No: Go to 3
Does it have more than 4 legs? (Yes/No)
Yes: Grasshopper
No: Snake
Does it have eight legs? (Yes/No)
Yes: Spider
No: Grab
To formulate a dichotomous key using the given organisms (snake, grasshopper, crab, spider), we can follow this structure:
Does the organism have legs?
Yes: Go to question 2.
No: It's a snake.
Does the organism have more than four legs?
Yes: Go to question 3.
No: It's a grasshopper.
Does the organism have a hard exoskeleton?
Yes: It's a crab.
No: It's a spider.
This dichotomous key helps differentiate between the organisms based on their characteristics. By answering the questions sequentially, one can identify the correct organism.
It starts by determining if the organism has legs or not, leading to the snake if it lacks legs. If the organism has legs, the key proceeds to assess the number of legs, identifying the grasshopper if it has four or fewer legs.
Finally, the presence or absence of a hard exoskeleton distinguishes between the crab and spider, with a hard exoskeleton indicating a crab and its absence indicating a spider.
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Exchange cast fossils with another group. Make inferences about the items used to make their cost fossils, and explain your reasoning.
Answers
Answer:
(I’m gonna edit this just wait 2 hours and I’ll be done)
Explanation:
the part of the stomach that is furthest from the outlet to the duodenum is called the:
Answers
The part of the stomach that is furthest from the outlet to the duodenum is called the fundus.
The fundus is a dome-shaped structure located above the cardiac notch and the body of the stomach. It is the most expanded part of the stomach, and its size can vary depending on the amount of food and liquid it contains. The fundus plays an important role in the digestive process, as it is responsible for storing and releasing the food that enters the stomach. When food enters the stomach, the fundus expands to accommodate it, and then gradually releases the food into the rest of the stomach for further digestion. The fundus also produces certain hormones and enzymes that aid in the digestive process, including gastrin, pepsinogen, and gastric lipase.
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Hybridomas, which produce monoclonal antibodies, are made by fusing cells of the immune system with.
Answers
Monoclonal antibodies are made by the fusion of cells of the immune system with B lymphocytes and myeloma cells.
What is Hybridoma technology?It is one of the best technologies that is used to produce the monoclonal antibody.In this hybridoma technology the B lymphocytes that are antibody producing are isolated from a source after the immunization with a specific antigen and then are fused with myeloma cell line to form hybrid cells that are also called as hybridoma cell lines.The hybridoma cell lines are then cultured in the laboratory with specific antigen and then the monoclonal antibodies are produced.This can be done in in-vivo or in-vitro condition.This method is preferred over all because the production of antibodies by this method is good as the antibodies produced are of high purity and highly sensitive and specific.These cell lines can also be preserved for a long time.Hybridoma technology has resulted in production of different varieties of monoclonal antibodies with specificity with specific antigens as the monoclonal antibodies are produced by single parental B cells.To know more about Antibodies visit:
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What type of scientist would be the best qualified to perform genetic engineering to pro- duce seed that are more productive in agriculture? A. biochemist B. geologist C. molecular biologist D. paleontologist
Answers
The type of scientist best qualified to perform genetic engineering to produce more productive seeds in agriculture would be a molecular biologist, the correct option is C.
Molecular biologists specialize in studying the structure, function, and interactions of molecules within biological systems, including DNA and genes. Genetic engineering involves manipulating the genetic material of organisms, which requires a deep understanding of molecular biology principles.
Molecular biologists have the expertise to identify and isolate specific genes responsible for desired traits in crop plants, such as increased productivity or resistance to pests or diseases. They can then modify or introduce these genes into target plants to achieve the desired outcomes, the correct option is C.
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Classify A large bar of solid gold is melted into liquid. The liquid is then poured into molds to make a number of gold coins. Was this a chemical or physical change?
Answers
Answer:
It is still identified as the same substance. In this case, since melting the gold bar is a change that takes place when the solid turns into a liquid, it undergoes a physical change.
Explanation:
This is a physical change. When solid gold melts into a liquid and is poured it will be a physical change.
What is a physical change?There are two types of changes such as physical change and chemical change. In a physical change, there is no change in molecular composition.
In chemical changes, the molecular composition of a substance will change. When gold is turned into a liquid it will melt. This is called a physical change.
In a physical change, the chemical composition of a substance remains the same. The atoms rearrange themselves in physical change.
Therefore, This is a physical change. When solid gold melts into a liquid and is poured it will be a physical change.
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Give 3 examples of convection currents in nature
Mechanism of Energy Transfer Requires direct contact? Requires a medium?
Conduction yes
Convection
Radiation
IMA GIVE BRAINLIEST!
Answers
Answer:
1.Radiator
2.Steaming cup of hot tea
3.Ice melting
Explanation:
1.Puts warm air out at the top and draws in cooler air at the bottom.
2.The steam is showing heat being transfered into the air.
3.Heat moves to the ice from the air. This causes the melting from a solid to liquid.
Explanation: