T cells are activated by two signals: t cell receptor engagement with the antigen co-stimulatory signal that occurs due to receptor-ligand interaction.
a. True
b. False

Answers

Answer 1
The statement above is TRUE.
T cells are part of the white blood cells and function in the immune system response of the body. T cells function by destroying infected cells. T cells can be activated either by T cell receptor engagement with the antigen or by the signal that is produced by the receptor ligand interactions.

Related Questions

genomics can be used in agriculture to?

Answers

It is used to generate new hybrid strains, improve disease resistance, and improve yield.

I hope this helps.

Genomics is used for producing genetically modified plants with better nutritional value.

What are genetically modified plants?

In recent years, and still, today, genetically modified (or GM) plants have garnered a lot of media interest. Considering this, the wider populace still doesn't fully understand what a GM plant is or the benefits and drawbacks of the technology, especially in light of the variety of uses it may be put to.

Harm to the environment and risk to human health are the two primary areas of concern from the first generations of GM crops. There may be growing public worry about potential health risks when GM plants are gradually brought into the European Union.

Although "health campaigns" by the press are increasingly ubiquitous, the information they disseminate is frequently erroneous and inaccurate in light of the existing scientific data. Since doctors are frequently the first people a worried patient consults, we believe it is critical that they are knowledgeable about the state of the art and capable of giving an educated opinion.

Therefore, Genomics is used for producing genetically modified plants with better nutritional value.

Read more about genetically modified plants, here

https://brainly.com/question/2511904

#SPJ6

Make sure to enter all cell reference in upper case when putting them in formulas.
a. True
b. False

Answers

The answer is true because this is essential when putting them in formulas so that the worksheet may be able to provide the values or find the values that are going to be calculated in the cell that has been provided.

Stitching of the large tissue that acts as a tendon and attaches muscles to bone is called what?

Answers

If it's not a tendon, then I'm pretty sure it's a ligament.
The correct answer is Arthrodesis.

Explain why the frog population would most likely decrease if there were a decrease in the cricket population

Answers

frogs eat bugs like crickets. they need them to survive. if there were a decrease in the cricket population it would disrupt the food chain and cause the frog population to decrease because one of their food sources are gone or depletes
because of a couple of things. one frogs rely on crickets as one of their biggest food sources. another would be because when minnows are ..i guess training to be a frog crickets are easy targets. Thanks!

(problem 22) if cancer is fundamentally a genetic disease, how might an environmental factor such as smoking cause cancer?

Answers

EF factors can cause cancer by acting as a mutagen. Higher rates of mutation= inactivation of tumor repressor and conversion of photo-oncogenes to oncogenes.

How can you measure the plant pieces to determine the rate of osmosis?

Answers

Answer: By measuring the plant's pieces mass, or the surface area to volume ratio.

By measuring the change in mass from initial to after solution indicates the net flow of water, if it increases it proves that osmosis occurred.
If the surface area to volume ratio decreases that also means that osmosis has occurred.

This measurements can’t be used to determine the rate of osmosis but can  prove that it occurred.

What is the rock that has no exposure to chemical or mechanical weathering known as? Subsoil Topsoil Regolith Bedrock

Answers

Subsoil: layer of soil under topsoil on the surface of the ground
Topsoil: fertile, upper part of soil
Regolith: unconsolidated residual or transported material that overlies the solid rock on the earth
Bedrock: lies under regolith, can be 100 meters undersurface.
Order of surface: Topsoil --> Subsoil --> Regolith --> Bedrock

Your answer is bedrock
The answer is bedrock

The mother of a 10-year-old boy with mild scoliosis asks the nurse, "how long will my son have to continue his exercises before he's better?" how should the nurse respond?

Answers

The mother of a 10-year-old boy with mild scoliosis asks the nurse, "how long will my son have to continue his exercises before he's better?" how should the nurse respond?

The ____________ ramus of a spinal nerve is the larger of the two branches, and innervates the anterior trunk as well as the upper and lower limbs.

Answers

The anterior ramus of a spinal nerve is the larger of the two branches and innervates the anterior trunk as well as the upper and lower limbs.
Anterior ramus is a branch of every spinal nerve as it occurs the vertebral canal, it supplies the lateral and ventral portions of the limbs, body wall, and perineum.

Gentoo penguins will present a mate with a pebble that they find to attract a mate. Emperor penguins have a specific call and movement that they make to attract a mate. Which type of isolation do these penguins demonstrate?
temporal isolation
behavioral isolation
geographical isolation
anatomical isolation

Answers

The answer is B behavioral isolation, I just took the test :)

Answer: Behavioral isolation

Explanation: edge 2023

How do sodium and potassium leak channels play a role in the development of the negative membrane potential of the axolemma (plasma membrane of the axon)?

Answers

The plasma membrane of axon is called axolemma. The potassium and sodium leak channels leak the sodium and potassium ions inside the cell respectively. The leak channels provide the constant movement of ions across the membrane. Potassium and sodium ions are positively charged, thus entry of positively charged ions inside the cell makes the cell more positively charged than the environment outside the cell. The environment outside the cell becomes more negatively charged. This leads in the negative membrane potential of axolemma.

The process of gene expression involves ____.
replicating a cell's genetic makeup during division
influencing the behavior of a segment of society
converting genetic instructions into a feature of a living cell
chromosomal recombination during gamete formation

Answers

The process of gene expression involves converting genetic instructions into a feature of a living cell.

Gene expression is the process by which instruction of our DNA is converted into functional output called as protein .

The example of gene expression can be differential expression of genes in human cells. human cells comprises of same DNA but each have different structures and functions. for example liver and brain cells have same amount of DNA but they have completely different function . Gene expression is influenced by many factors that includes mutation , molecules within the cells or epistasis.

To learn more about Gene expression , here

brainly.com/question/15159232

#SPJ1

Final answer:

Gene expression involves converting DNA instructions into proteins through transcription and translation, enabling cells to perform specific functions and differentiate into various types within a multicellular organism.

Explanation:

The process of gene expression involves converting genetic instructions into a feature of a living cell by utilizing the information encoded in the cell's DNA. Specifically, gene expression includes two crucial processes: transcription and translation. During transcription, the information from a gene (DNA) is copied into messenger RNA (mRNA). Subsequently, during translation, the mRNA serves as a template to link specific amino acids in the correct order to form a protein, guided by the sequence of the transcript. This process is essential for regulating the biological functions of the cell and ensuring that proteins are synthesized as needed, contributing to the cell's structure and function.

Gene expression is also a key factor in cellular differentiation and organismal development. Even though all cells in a multicellular organism contain the same DNA, different cell types express different subsets of genes. This regulation of gene expression permits the formation of various cell types and tissues and allows for complex life forms to exist. The chapter overviews provided discuss how gene expression is regulated, touching on aspects such as transcriptional regulation, epigenetics, and the effects of environmental factors on gene expression patterns. Overall, controlling gene expression is vital for normal development and for the cell's response to environmental changes.

An atom of radon gas emits an alpha particle as shown below. Radon-222 has 86 protons and 136 neutrons. What daughter product will form from this decay?

Answers

The answer is Polonium-218 (84 protons).

Alpha particles consist of two protons and two neutrons. So, mass is 4 (2+2) amu .
When an atom of emits an alpha particle, its atomic number will be reduced by 2 and a mass number will be reduced by 4:
 →  + .

After emission of the alpha particle from Radon-222 with 86 protons, the daughter product will have the atomic number reduced by 2: 86-2 = 84 and the mass number reduced by 4: 222-4=218:
  →  + .

Correct Answer: B. Polonium-218 (84 protons)

Explanation: The original atomic number of radon is 86, and the mass number is 222 (136 neutrons plus 86 protons). The emission of an alpha particle will reduce the mass number by 4 and the atomic number by 2. Therefore, radon-222 (86 protons) yields polonium-218 (84 protons).

give 2 other names for sunlight energy.

Answers

solar energy

Heat energy (radiation)

are your answers

hope this helps
Solar energy, and radiant energy.


.WILL GIVE A BRAINLEST



How does the arctic fox survive the harsh winters in the tundra?


It feeds on large amounts of mosses, lichens, and insects.


It migrates to coastal areas during the winter months to catch fish.


It feeds on animals that it captured during the summer and then stored underground.


It hibernates during the winter and does not wake to eat.

Answers

Final answer:

The arctic fox survives winter by growing a thicker, insulated coat, changing its color for camouflage, conserving body heat through its body shape, and by continuing to actively hunt and scavenge for food rather than hibernating or storing food.

Explanation:

The arctic fox is remarkably adapted to survive the harsh winters of the tundra. This animal has evolved to have a coat that changes color with the seasons—white in winter to blend with the snow and dark in summer to blend with the landscape—which also grows longer and denser during the colder months to trap heat. This thick fur is crucial for insulation against the cold. Additionally, the arctic fox does not hibernate; instead, it continues its usual hunting activities. It feeds on a variety of small animals and will often follow larger predators like polar bears to scavenge leftovers. Its diet includes rodents, birds, and even fish if they are accessible. Moreover, the anatomy of the arctic fox, including its round body shape, short muzzle, and legs, helps minimize the surface area exposed to the cold, further conserving heat. During the summer, it is known to accumulate fat reserves to prepare for leaner times, but it does not hibernate or store food underground as some other animals do.

Explain how the hitech provisions use health it to support health care reform.

Answers

HITECH stands for Health Information Technology for Economic and Clinical Health (HITECH). The  provision gives base and directions how to achieve some goals in the health care system , like health care delivery
improve health care quality, reduce costs; and increase accessthrough better methods of storing, analyzing, and sharing health information. This way the HITECH provision supports health care reform. 
information.

The HITECH provisions support healthcare reform by promoting the use of Health IT to improve care, decrease costs, and expand access to health insurance. This includes the adoption of EMRs and the establishment of health insurance exchanges, all underpinned by enhanced security measures.

The HITECH provisions enhance healthcare reform efforts by leveraging Health Information Technology (Health IT) to improve healthcare quality, prevent medical errors, reduce healthcare costs, increase administrative efficiencies, decrease paperwork, and expand access to affordable healthcare. Specifically, HITECH encourages the use of Electronic Medical Records (EMRs) to reduce administrative costs associated with paper records. It envisions a more efficient healthcare system where the easy exchange of health information supports better patient outcomes and cost savings. Additionally, health IT is fundamental in the establishment of health insurance exchanges that increase insurance accessibility and affordability through an organized and competitive market.

Another key focus is on security concerns in the healthcare industry. With the move towards digital records and information exchange, there are provisions for stricter security measures to protect patient information. As part of the Affordable Care Act (ACA), HITECH provisions are aimed at improving the overall health insurance system through technology, which will also influence the cost-effectiveness of care and the ability to manage population health more effectively.

In eukaryotic cells, each stage of cellular metabolism generates a different net amount of atp. which stage directly generates the greatest number of atp molecules per metabolized glucose molecule?

Answers

Electron transport chain and ATP synthase

In a living organism to sustain itself several process that occur is called as cellular metabolism.

Cellular metabolism utilizes reactants like food and nutrients to produce energy.

In the process of cellular metabolism electron transport chain generates the greatest number of ATP molecules per metabolized glucose molecule.

ETC is a complex buried in mitochondrial layer to transport NADH and FADH₂.

It is the ultimate step of cellular respiration and delivers most ATP molecules.

From one molecule of glucose 38 ATP molecules are created.

Therefore, Electron transport chain with the help of ATP synthase generates the greatest number of ATP molecules.

To learn more about ETC refer to the link:

https://brainly.com/question/24372542

If a plant uses up all the available carbon dioxide, which event will happen first?

Answers

A decrease in its sugar production.

Answer: The correct answer is -

Decrease in the rate of photosynthesis that is formation of carbohydrate (glucose) will be reduced.

Carbon dioxide (CO2) is one of the essential reactants in the process of formation of food (photosynthesis) in plants.

Photosynthesis is a process of formation of food (glucose) in green plants and algae using CO2 and H2O (water) in the presence of sunlight.

If all the available carbon dioxide is used up by a plant, the process of photosynthesis will be affected significantly, which will cause a decline in the formation of carbohydrate (glucose) in the plant.

Collaborations between environmental groups and business interests on environmental issues have resulted in successful partnerships.
T/F ??

Answers

this is true as environmental groups campaign to conserve natural places to protect them

It is true that collaboration between environmental groups and business interests on environmental issues results in conservation of nature.

What do you mean by environmental issues?"Environmental issues may include climate change, pollution, environmental degradation, and resource depletion."It degrades the quality of nature.What do you mean by conservation of nature?"Conservation of nature focused on protecting species from extinction, maintaining and restoring habitats, enhancing ecosystem services, and protecting biological diversity."Many environmental groups and business interest on environmental issues have taken many initiatives towards nature conservation.

Hence, the given statement is true.

To know more about environmental issues here

https://brainly.com/question/20868987

#SPJ2

What is the most direct way to differentiate between types of epithelial tissue

Answers

The most direct way to different types of epithelium tissue is by the number of cell layers and by the shape of the cells. As for the layers, they can be simple, if there is only one layer of cells, or stratified, if there is more than one layer of cells. Related to the shape of the cells it can be a squamous epithelium, a cuboid epithelium, a columnar epithelium, or transitional when the cell can adopt different shapes so that the epithelium can be stretched.

What type of bond keeps each individual DNA strand together?

Answers

Final answer:

Hydrogen bonds keep each individual strands of DNA together. These bonds form between adenine and thymine, and cytosine and guanine, contributing to DNA's distinctive double helix structure.

Explanation:

The type of bond that keeps each individual DNA strand together is referred to as hydrogen bonds. These bonds are formed between the nitrogenous bases of the two DNA strands, effectively linking them. For instance, adenine (A) forms a hydrogen bond with thymine (T), while cytosine (C) bonds with guanine (G). Moreover, these hydrogen bonds contribute to the distinctive double helix structure that DNA is recognized for.

Learn more about Hydrogen Bonds here:

https://brainly.com/question/33738484

#SPJ12

The individual DNA strands are held together by hydrogen bonds. These hydrogen bonds form between the nitrogenous bases of the two DNA strands, creating the characteristic double-helix structure of DNA.

DNA (deoxyribonucleic acid) is a long, double-stranded molecule that carries genetic information in living organisms. It has a distinctive double-helix structure, which means it consists of two long strands that wind around each other like a twisted ladder.

The hydrogen bonds form between these complementary base pairs, and they provide the specificity in DNA base pairing. This means that in a DNA molecule, if you have an adenine on one strand, it will always pair with a thymine on the other strand, and vice versa.

DNA Replication: When the cell needs to make a copy of its DNA, the hydrogen bonds between the base pairs are temporarily broken, allowing the two DNA strands to separate.

Transcription: During transcription, which is the process of making RNA from a DNA template, the DNA double helix is also temporarily "unzipped" by breaking the hydrogen bonds between base pairs.

Try to know more about hydrogen:

https://brainly.com/question/30623765

#SPJ12





DNA replication or repair occurs in a cell in all of the following situations, EXCEPT when

A)
cells undergo meiosis.


B)
cells undergo mitosis.
Eliminate

C)
proteins are synthesized.


D)
cells repair damage from UV light

Answers

DNA replication occurs in a cell in all of the following situations, EXCEPT when 



Answer: C. proteins are synthesized 

                        Good luck and have a nice Benevolentpuppy day! :D

Answer:

C)  proteins are synthesized.

Explanation:

It is only when protein is being synthesized DNA replication or repair does not take place. In rest of the situations, DNA replication and repair does take place. In fact while mitosis and meiosis, DNA repair plays a very important role. If a DNA is damaged at the time of these events and in case it is not repaired immediately then all the subsequent cells arising from such cell will have damaged DNA. Such cells with damaged DNA are not fit because they can give rise to cancer. So, our body does best to repair DNA of such cells, but if still the body fails to repair such damaged DNA then the body decides to kill such cells through apoptosis. UV light causes thiamine thiamine dimer formation which leads to a disease known as xeroderma pigmentosum. This kind of DNA can be repaired by supplying electron beams so that thiamine thiamine dimer could dissociate.

Which is the last step that occurred in the speciation of the Galápagos finches? A. ecological competition B. geographic isolation C. establishing genetic equilibrium D. founders arrived

Answers

Answer:

The correct answer is option A, that is, ecological competition.

Explanation:

The small number of finches reached the Galapagos Island and established themselves. The phenomenon of the geographical isolation of the Galapagos Islands resulted in the inhibition of interbreeding between the populations of finches found on the different islands.  

The distinct populations of finches gathered changes to get amended to accessible food. The gathering of genetic variations and geographical isolation resulted in the reproductive isolation between them. In order to get better amended with the surroundings, the population of finches encountered with enhanced genetic variations between them, which is considered as ecological competition. The repetition of the entire procedure of the chain of islands resulted in the evolution of distinct species of finches.  

Courtney is a participant in a laboratory sleep study. her eeg begins showing small bursts of electrical activity known as sleep spindles. courtney has entered _____ sleep.

Answers

Courtney has entered STAGE 2 SLEEP.
There are two types of sleep, REM and NON REM SLEEP. The NON REM sleep is divided into three stages, which are stages 1, 2 and 3. The stage 2 of the NON REM sleep is the most prominent sleep stage. At this stage, the EGG usually show small burst of electrical activity which is called sleep spindle.

How are the proteins used for active transport different from those used for facilitated diffusion?
A:The proteins for facilitated diffusion must attach to a carbohydrate to work.
B:The proteins used in facilitated diffusion create larger openings in the cell membrane.
C:The proteins involved in active transport must be powered by ATP to work.
D:The proteins that carry out active transport move only the largest molecules.

Answers

AnswerC) The proteins involved in active transport must be powered by ATP to work.Explanation:

If we talk about active transport mechanisms, it means that the proteins basically require the use of the energy, that energy is usually in the form of adenosine triphosphate (ATP). but if we talk about the facilitated diffusion, then the solute can move from the regions of lower concentration to the region of higher concentration. In this way, the proteins used for active transport different from those used for facilitated diffusion.

Final answer:

Proteins used for C. active transport and facilitated diffusion are different in terms of energy requirement, direction of movement, and conformational changes.

Explanation:

The proteins used for active transport are different from those used for facilitated diffusion in several ways.

The proteins involved in active transport require energy in the form of ATP to move molecules against their concentration gradient, while the proteins used in facilitated diffusion do not.The proteins for facilitated diffusion help molecules passively move down their concentration gradient through specific channels or carriers, while the proteins involved in active transport can move molecules against their concentration gradient, usually through pumps or carriers.The proteins for facilitated diffusion do not undergo any conformational changes and do not require any external energy, whereas the proteins for active transport undergo conformational changes and require ATP.

Learn more about Proteins used for active transport and facilitated diffusion here:

https://brainly.com/question/12792549

#SPJ6

Which of the fayum primates may be linked to the platyrrhines as evidenced by the presence of three premolars?

Answers

The appropriate response is parapithecids. The parapithecids are the most primitive of the higher primates. Its primitive highlights incorporate its dental equation which is the same as New World Monkeys. From this, we may derive that it is the primitive dental equation of every single higher primate and that it pre-dated the split between Old World and New World monkeys.

WILL GIVE A BRAINLEST



When applied to ecology, what does the new science of chaos imply?


Interactions in ecosystems can never be understood.


Balance in ecosystems never really occurs.


One small change in an ecosystem can lead to drastic results.


New conditions in ecosystems lead to predictable chang

Answers

The correct answer is the third one down.

Answer:

The correct answer is option C.

Explanation:

In ecology, chaos theory states that the ecosystem is very sensitive to any minor change and even can lead to a very drastic change in the environment. The changes can not be predicted that occur due to these drastic environmental changes.

According to this theory, the beginning state of an ecosystem is very crucial to its future development.

The major attraction of municipal bonds is their extremely low risk.
a. True
b. False

Answers

It would be false. Please mark as Brainliest!

Mrs. m ate, her intestinal contents became __________ to her blood. her blood became __________ to her intestinal contents.

Answers

Her intestinal contents became hypertonic solution to her blood. Her blood became hypotonic solution to her intestinal contents. In hypertonic solution the total substance concentration of all dissolved solute is greater than the concentration in a cell. In hypotonic solution the substance concentration of all dissolved solute is less than that of a cell.

In the dash-sodium study, which amount of sodium was found to be the most effective as a daily limit?

Answers

1,500 g of sodium was found to be most effective.
Other Questions
Through which of these media do sound waves travel most slowly? A.iron. B.Wood. C.Water. D.Cold Air which kind of energy dose a stretched rubber band have can someone plz help with This question thxs How are different populations able to live in the same community? Why is the period between 461-420 bce known as the golden age of athens? If an offender is required to pay a victim money it is called?A) a fineB)restitutionC)incarcerationD)asset forfeitureBeing an informed citizen falls under which category?A) a civic dutyB)a voting requirement C)a civic responsiblity D)a constitutional amendment A child learns values, beliefs, and behaviors through:A. primary socialization.B. self-definition.C. interests.D. ethnicity. What happens to the area of a circle when the radius is tripled? An assembly line is an example of which type of Labor strategy According to the equation for this chemical reaction, what does the 2 in front of 2Ag tell us? Ferdinand ii tried to exert authority over _____________ and to suppress the _________________________________. Most high schools have all of the following persons who can provide help except a:A. School nurse B. School psychiatrist C. School psychologist D. Guidance counselor Who had the power to resolve the dispute between New Hampshire and New York regarding Vermontno onecongressthe state militiasthe continental army All objects will remain at ___ or will continue to move at a constant ___ in the same ___ unless acted upon by an unbalanced ___. this property is called ___ What is the circumference of the circle shown below, given that the length of ED (the minor Arc) is 6? Which of the following is an example of sanitizing A publisher displays its latest magazine cover on its website.The publisher scales up the front cover of the magazine using a scale of 6 centimeters to 1 inch. The length of the scale drawing is 48 centimeters, and its width is 66 centimeters.The length of the actual magazine cover is inches. The width of the actual magazine cover is inches. The scale drawing is too big to view on a computer screen without scrolling. the publisher uses a new scale of 4 centimeters to 1 inch. The length of the new scale drawing is centimeters. The width of the new scale drawing is centimeters. Why is Mexico and parts of Central America prone to earthquakes?Question 15 options:There is no clear reason why the area is prone to earthquakes.The building codes are old and outdated.The soil is soft and easily moved.The region lies on the border of two tectonic plates. Eric is hanging a rectangle mirror that has a diagonal of 47 inches with an angle of depression of 60. How many square inches is the mirror? Consider the reaction mg(s)+fe2+(aq)mg2+(aq)+fe(s) at 79 c , where [fe2+]= 3.50 m and [mg2+]= 0.310 m . part a what is the value for the reaction quotient, q, for the cell? express your answer numerically. At 5 a.m., the temperature at an airport was 9.4F . Six hours later, the temperature was 2.8F . Which expression represents the total temperature change over the six hours? |2.8(9.4)| 9.4+2.8 |9.4+2.8| |2.8+(9.4)| Steam Workshop Downloader