Which of the following are functions related to the expression of MHC molecules?
a. To display self-peptides to test developing T cells for autoreactivity
b. To display self-peptides to demonstrate cell health
c. To display self-peptides to maintain self-tolerances
d. To display foreign peptides
e. All of the answers are correct.
Answer:
e. All of the answers are correct.
Explanation:
The major histocompatibility complex (MHC) is a locus that contains several polymorphic genes. These genes are known to encode different components of the immune system, especially cell-surface proteins which present antigens to the T cell receptors during adaptive immune responses. The MHC genes are classified into Class I, Class II and Class III:
1- MHC class I genes encode cell surface molecules that present peptides (antigens) to cytotoxic T lymphocytes (i.e., killer T cells)
2- MHC class II genes encode cell surface molecules that present antigens to CD4+ T cells
3- MHC class III genes encode proteins that are not involved in antigen presentation (i.e., components of the complement cascade, cytokines, etc)
Identify the parts of the DNA molecule below
Explanation:
where is question or diagram
What compound do plants get from their roots for photosynthesis?
options:✨✨✨
Carbon Dioxide
Oxygen
Glucose
Water
How are coral reefs similar to tropical rainforests?
Ó Both are home to just a few types of rare animals.
Both can easily be restored if they are destroyed.
Both support a huge quantity and variety of organisms.
O Both are found in all types of climates around the world.
Answer:
Both support a huge quantity and variety of organisms.
Explanation:
What is detritivores
Answer:
An animal which feeds on dead organic material, especially plant detritus.
Explanation:
Detritivores, are heterotrophs that obtain nutrients by consuming detritus. There are many kinds of invertebrates, vertebrates and plants that carry out coprophagy. By doing so, all these detritivores contribute to decomposition and the nutrient cycles.
URGENT PLEASE HURRY
Answer:
starting point 3 traveling at a velocity of 15 I think
Explanation:
sorry if you get it wrong
Which statement correctly distinguishes the functions of proteins from other types of biomolecules?
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, the four major biomolecules have the following different functions
1) Nucleic acid (as in DNA and RNA): They are a sequence of nucleotides that store organism's genetic code. This nucleotide sequence in turn determines an organism's protein sequence.
2) Carbohydrates: They are important structural components of various "compositions" in an organism (such as the cellulose in cell wall and ribose in nucleotide). They also serve as energy sources for the body.
3) Lipids: They also serve as energy sources and are part of membrane composition (as in the case of the phospholipid cell membrane).
4) Proteins: They are major structural elements of cells. They serve as enzymes in many biological activity (such as hexokinase in glycolysis and DNA polymerase in DNA replication). They also form hormones (such as insulin) and antibodies (such as the Immunoglobulins).
What are the 3 elements that cause seasons?
which is a characteristic of pseudoscience
resistance to change
continually changing
involves a step-by-step method
updated by new technology
Answer:
a
Explanation:
i took the test
A cold front often brings intense weather changes such as thunderstorms while a warm front often brings light rain or drizzle. Why is this the case?
Answer:
The front term is associated with an area where two air masses met and as it is usually the condition with heavy rain, fierce wind, snow and other violent weather like a war situation. The front could be warm, cold, occluded or stationary depends on the type of weather.
The cold front is associated with lots of thunderstorms and other intense weather while the warm front changes with drizzly rain and warmer weather due to the fact that in a cold front, replacement of warm air by the cold air is faster while in a warm front, the replacement of cold air by warm air is gradual
Help please idk the answer
Answer:
whats the rest of the question?
Explanation:
Starting with the basic building blocks, which is the correct order of levels of organization of complex organisms?
A. organ systems --> cells --> tissues --> organs
B. cells --> tissues --> organs --> organ systems
C. tissues --> organs --> organ systems --> cells
D. organs --> organ systems --> cells --> tissues
Answer:
A
Explanation:
How can larger carbon-based molecules and amino acids be a result of chemical reactions between sugar molecules and other atoms?
report about Reduce, Reuse, Recycle and example
Answer:
reduce is reducing the amount of plastic we use reuse is reusing a plastic item for something else recycle is convert into a new material hope this helps!
Explanation:
i need help on this please ASAP
Answer:
What's the question? Its not written here
Answer:
Where is the question?
Explanation:
Which of these statements about the world's food supply is most accurate? A. Overnutrition is greater world problem than undernutrition. B. Food is more expensive than in the pre-1970 world. C. Some food is diverted for use as fuel. D. Less food per person is produced today than in the past.
Answer:
C. some food is diverted for use of fuel
help idk this answer
Answer:
d
Explanation:
what is the lagging strand synthesized by?
Answer: Unlike leading strands, lagging strands are synthesized as discrete short DNA fragments, termed 'Okazaki fragments' which are later joined to form continuous duplex DNA. Synthesis of an Okazaki fragment begins with a primer RNA-DNA made by polymerase (Pol) α-primase.
Explanation:
Which correctly describes crossing over?
a.)the process whereby nonsister chromatids exchange genetic material
b.)the process whereby homologous chromosomes are pulled to opposite poles of the cell
c.)the process whereby sister chromatids are pulled to opposite poles of the cell
d.)the process whereby homologous chromosome pairs align randomly along the metaphase plate
Sucrose is an organic compound made by plants for quick energy.
What type of organic compound is sucrose?
(a.protein
(b.carbohydrate
(c.lipid
(d.nucleic acid
what is mean by exc
Answer:
QEMM Exclude file for Optimize (do not process the data) Computing » File Extensions.
Please select the word from the list that best fits the definition
minerals mined for titanium
usefulness, profitability
lightness, durability
ilmenite, rutile
automobiles, aircraft
beauty, rarity
Mark this and retum
Answer:
e
Explanation:
im just built different
Answer:
E
Explanation:
A car moves with an initial velocity of 15 m s-1 and accelerates with constant acceleration 4 m s-
2 for 50 seconds. What is the total distance travelled?
what makes terrestrial different
Answer:
Terrestrial planets are Earth-like planets made up of rocks or metals with a hard surface. Terrestrial planets also have a molten heavy-metal core, few moons and topological features such as valleys, volcanoes and craters.
Explanation:
Is that what your talking about?
Type 1 diabetes is caused by destruction of beta cells in the pancreas that produce insulin. Which of the following best explains why a person with this disease needs medication?
a. Medication is needed to act as a signaling molecule to activate the signal transduction pathway.
b. Medication is needed to allow alternate signaling transduction pathways to control glucose levels.
c. Medication is needed to open channels to allow signaling molecules to enter pancreatic cells.
d. Medication is needed to serve as second messengers to regulate glucose uptake by cells.
Answer:
the answer is a. Medication is needed to act as a signaling molecule to activate the signal transduction pathway.
i took the quiz
Medication is needed to act as a signaling molecule to activate the signal transduction pathway. So, the correct option is (A).
What is Type 1 Diabetes?Type 1 diabetes also called insulin-dependent or juvenile diabetes which is usually develops in children, adolescents, and young adults, but it can occur at any age. A condition in which the immune system destroys the insulin-producing cells in the pancreas. These are called beta cells.
There are several signs of type 1 Diabetes which include:
Extreme thirstIncreased hungerDry mouthUpset stomach and vomitingFrequent urinationWhen a person suffering from this disease needs medication which is need to act as signaling molecule to activate the signal transduction pathway. Type 1 Diabetes is characterized by a progressive loss of insulin-producing β-cells in the islets of the pancreas. Immune destruction of β-cells is partly mediated by high levels of pro-inflammatory cytokines.
Thus, medication is needed to act as a signaling molecule to activate the signal transduction pathway. So, the correct option is (A).
Learn more about Type 1 Diabetes, here:
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What are some changes that can occur in ecosystems?
Answer:
Some changes that can occur in ecosystems are seasons, tide cycles, population sizes, succession, evolution, landscape changes, and climate changes.
Explanation:
hope it helps you sir or ma'm
Which describes a altocumulus cloud?
a.
high, feathery cloud
c.
low storm cloud
b.
puffy mid-level cloud
d.
high cloud made of ice crystals
Please select the best answer from the choices provided
A
B
C
D
Answer:
B. Puffy mid-level cloud
Why do you think prokaryotic cells do not have all the organelles that eukaryotic cells do? What does this tell you about prokaryotic cells?
Answer:
Explanation:
A prokaryotic cell is a type of cell that does not have a true nucleus or membrane-bound organelles. Organisms within the domains Bacteria and Archaea are based on the prokaryotic cell, while all other forms of life are eukaryotic
A prokaryotic is a primitive cell that lacks organelles, unlike the eukaryotic cells, and are simple organisms.
What are prokaryotes?Prokaryotes are organisms that are simple and evolved before the complex eukaryote. They include bacteria and archaea that are simple and lack organelles that are found in eukaryotes.
They do not have a nucleus and rather have their genetic material disposed of as nucleoids in the center of the cell that undergoes the simple process of the central dogma.
The simple cellular processes and reproductive methods are the reason they lack many organelles. This tells that prokaryotes are simple and primitive types of cells.
Therefore, prokaryotes lack a distinct nucleus.
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how to get sick with fever fast
Answer: Over exhaust your self and stay up for two days no sleep.
What human activity provides a reasonable analogy for the movement of kinesin molecules along microtubules?a. running on a treadmill.b. climbing a rope hand over hand.c. shooting a fire hose at a beach ball.d. being one of many rowers in a boat .
Answer:
The correct answer is - option. b climbing a rope hand over hand is correct
Explanation:
The movement of the kinesin molecules led by the head of one kinesin followed by the second one after another same as one hand moves on the rope at a time and followed by the other hand during climbing the rope.
The movement of the kinesin microfilament is due to the increased affinity by ATP of the head of the kinesin for the microtubule. However, the hydrolysis of ATP decreases its affinity so it slides or moves to the plus end.