(Negative Selection) Autoreactive. Cells with a T cell receptor that can bind MHC class I or II molecules with at least a weak affinity are chosen by positive selection.
This destroys any T cells that wouldn't function because they couldn't bind MHC (a process known as "death by neglect"). Family loyalty. T-cell lineage commitment in hematopoietic tissue. Multiple selection processes, such as positive selection, negative selection, and agonist selection, that take place during the formation of T cells in the thymus work together to select a functional and self-tolerant T cell repertoire. T cells must be able to recognise the antigen-MHC complex in order to be effective in fighting infections and other foreign cells.
To know more about Autoreactive, click here:
https://brainly.com/question/29556363
#SPJ4
When this organism is dead, it is eaten by worms whose waste recycles energy back into the
soil. This organism only consumes other organisms that make their own chemical energy by
using solar energy.
What type of organism is being described?
Answer:
Decomposers
Explanation:
They break apart dead organisms into simpler inorganic materials, making nutrients available to primary producers.
during which phase of mitosis do the chromosomes separate?
Anaphase is the phase of mitosis in which chromosomes will separate.
Anaphase is the fourth phase of mitosis, in which the process that will separates the duplicated genetic material which is carried in the nucleus of a parent cell into the two identical daughter cells. Before anaphase begins, the replicated chromosomes, called as sister chromatids, are aligned at along the equator of the cell on the equatorial plane. The sister chromatids are the pairs of an identical copies of DNA joined at a point known as the centromere.
During anaphase, each pair of the chromosomes will separated into two identical, independent chromosomes. The chromosomes are separated by a structure called as the mitotic spindle. The mitotic spindle is made up of many long proteins called microtubules, which is attached to a chromosome at one end and to the pole of a cell at the other end.
To know more about Anaphase here
https://brainly.com/question/13552391
#SPJ4
PLS HELP !! i’ll give brainliest to whoever answers correct
Answer:
i would say c
Explanation:
Are there more prokaryotes or eukaryotes on Earth?
Answer:
Although prokaryotic cells appear far less advanced than eukaryotic cells, prokaryotic organisms outperform eukaryotes in many
Explanation:
Water and land has formed on earth, but why is life still impossible?
Answer:
Explanation:
Water and land has formed on earth, but still life is impossible because of the pollution created by human beings. Due to increase of pollution ozone layer is depleting day by day which can results the life of human being exist from the earth.
The life is not eternal, so even if we have all things, sometimes, the life becomes impossible. Human are creating so unnatural things such as pollution, which making the earth worse for living.
What is Earth?The earth is a solid planet, and it's the only planet with life.
Earth contains many things such as water and oxygen that is necessary for life.
Humans are polluting the earth too much, that if making it difficult to live.
Pollution can lead to many lethal diseases.
Thus, the life is not eternal, so even if we have all things, sometimes, the life becomes impossible. Human are creating so unnatural things such as pollution, which making the earth worse for living.
Learn more about earth
https://brainly.com/question/12041467
What are common changes
In an environment?
Answer:shelter, land, prey
Explanation:
an albino corn snake is crossed with a normal-colored corn snake. the offspring are all normal-colored. when these first-generation progeny snakes are crossed among themselves, they produce 32 normal-colored snakes and 10 albino snakes. which of these phenotypes is controlled by the dominant allele?
The normal-colored phenotype is controlled by the dominant allele.
The normal-colored phenotype is controlled by the dominant allele because when the albino corn snake is crossed with the normal-colored corn snake, all of the offspring are normal-colored. This suggests that the normal-colored phenotype is dominant over the albino phenotype, meaning that the normal-colored phenotype is controlled by the dominant allele.
When the first-generation progeny snakes are crossed among themselves, they produce 32 normal-colored snakes and 10 albino snakes, further confirming that the normal-colored phenotype is controlled by the dominant allele.
Learn more about dominant allele:
https://brainly.com/question/27303166
#SPJ4
"Curfews for Children" discusses opinions and reasons both for and against curfews. "Children
Don't Need Curfews" argues against curfews. Think about the claims, reasons, facts, and details
presented in both passages. Why might a child be in favor of curfews? Write an argument from
the perspective of a child who supports a curfew. Include evidence from both passages to support
your claim.
As a child, I support having a curfew because it promotes safety, healthy habits, and personal responsibility.
Why do children need curfews?As a child, I support having a curfew and I believe it can have a positive impact on our lives. While the article "Children Don't Need Curfews" argues against curfews, there are valid reasons why I think they are important.
Firstly, curfews provide a sense of safety and security. As a child, I may not fully understand the dangers of being out late at night. Having a curfew ensures that I am home and safe during the night. According to "Curfews for Children," curfews can reduce the likelihood of criminal activity and protect children from being victims of crime. This is important because it helps me feel safe and secure in my community.
Secondly, curfews can promote better sleep habits. As a child, getting enough sleep is essential for my health and well-being. "Curfews for Children" states that sleep deprivation can lead to poor academic performance, behavior problems, and even health issues. By having a curfew, I am encouraged to establish a routine and get enough rest each night. This ultimately benefits me in the long run.
Lastly, having a curfew can help me develop responsibility and self-discipline. By adhering to a curfew, I am learning to follow rules and regulations. This can translate to other areas of my life such as school or sports. According to "Curfews for Children," having a curfew can teach children self-discipline and help them make responsible decisions. As a child, it is important to develop these skills to succeed in the future.
Learn more about curfews at: https://brainly.com/question/2109002
#SPJ1
Chicken Wing Dissection What is the difference between a ligament and a tendon?
Answer:
Read below.
Explanation:
A ligament is a type of connective tissue that connects bones to other bones, while a tendon is a type of connective tissue that connects muscle to bone.
In a chicken wing dissection, you may see ligaments connecting the bones of the wing, and tendons connecting the muscles of the wing to the bones.
Ligaments and tendons are both made up of collagen, a tough and flexible protein that allows them to withstand the forces of movement and tension.
However, ligaments are typically more flexible than tendons, allowing for a wider range of movement in the joints.
You have a plant that you want to show off at a party. The party happens during autumn (aka fall). Usually in autumn (aka fall) the leaves of your plant fall off. You want to delay the leaves falling off your plant until after the party. What plant hormone would you use to help keep the leaves on? ethylene O cytokinins O gibberellins auxin
Answer:
Auxins
Explanation:
Auxin is a plant hormone that has to do with both leaf and fruit fall.
5. What are virus hoaxes? Why are the hoaxes sometimes more dangerous than an actual virus?
Answer:
An actual computer virus is a malicious software, often known as malware, that can harm a computer and its users.
Virus hoaxes are false or misleading information about viruses that circulate through various communication channels.
They can be more dangerous than actual viruses due to their ability to spread quickly, cause panic, and undermine effective public health measures.
Virus hoaxes are deceptive messages or claims that often exaggerate the severity or impact of a particular virus. They can be spread through social media, email chains, or word of mouth. These hoaxes may include misinformation about symptoms, transmission methods, or false remedies, leading people to take ineffective or even harmful actions.
What makes virus hoaxes particularly dangerous is their potential to create panic and misinformation at a rapid pace. The viral nature of social media and other communication platforms allows these hoaxes to reach a wide audience within a short period. As a result, people may make decisions based on false information, such as avoiding necessary medical treatment, taking unnecessary precautions, or spreading fear and misinformation to others.
Moreover, virus hoaxes can undermine public health efforts by diverting attention and resources from legitimate preventive measures. They can erode trust in healthcare authorities and disrupt the dissemination of accurate information, making it harder for individuals to make informed decisions and follow recommended guidelines.
This can have severe consequences, especially during outbreaks or pandemics, where timely and accurate information is crucial for public safety. Therefore, it is essential to verify the credibility of information and rely on trusted sources to mitigate the risks associated with virus hoaxes.
Learn more about viruses :
https://brainly.com/question/29156932
#SPJ11
Ms.Tim wants to find out how sleep affects students test scores.He organized two groups of students.In Group A, He has student sleep for three hours and then take the test.In Group B , he has students sleep a normal amount of hours (8 hours) and has them take a test.
• What is the independent variable?
• What is the dependent variable?
• Which is the experimental group
• Which is the control group?
Answer:
Independent Variable: Hours of sleep
Dependent Variable: Test scores
Experimental Group: Group A
Control Group: Group B
Explanation:
Hours of sleep is the independant variable because it is the factor being tested by the teacher. This is the factor that can be controlled.
Test scores is the dependant variable because it is the factor being affected by the changes in the independent variable. This is the variable being measured.
Group A is the experimental group because this is the one that has been altered or changed from what is normal.
Group B is the control group because nothing is being changed in this group but simply measured as a basis for comparison.
What is the order of the 3 steps of cellular respiration?.
Glycolysis, the citric acid cycle, and oxidative phosphorylation are the three basic processes that take place during cellular respiration.
Respiration is the process by which dietary components are oxidised within cells to release energy. The body then uses this energy to carry out a number of physiological and biochemical functions.
Cellular respiration takes place in three stages. They consist of:
Glycolysis is the initial process that turns glucose into pyruvate.
Pyruvate produced during glycolysis is transformed into energy substances like ATP, NADH, and hydrogen ions during the Krebs cycle.
By using the hydrogen ions generated during Kreb's cycle, oxidative phosphorylation powers the electron transport chain and produces ATP.
To learn more about ATP click here:
https://brainly.com/question/21093711
#SPJ4
What do structures b and c have in common? the parts of the digestive tract are labeled. part b is the esophagus and part c is the stomach. both contain chyme. both contain partially digested food. both contain waste material ready for removal. both contain stored food.
Correct option is B. Both contain partially digested food.
What is meant by digestion?Digestion is the mechanical and chemical break down of food into small organic fragments. It is important to break down macromolecules into smaller fragments that are of suitable size for absorption across the digestive epithelium.
Large, complex molecules of proteins, polysaccharides, and lipids must be reduced to simpler particles such as simple sugar before they can be absorbed by the digestive epithelial cells. Different organs play specific roles in the digestive process. The animal diet needs carbohydrates, protein, and fat, as well as vitamins and inorganic components for nutritional balance. How each of these components is digested is discussed in the following sections.
The partially digested food and gastric juice mixture is called chyme. Gastric emptying occurs within two to six hours after a meal. Only a small amount of chyme is released into the small intestine at a time. The movement of chyme from the stomach into the small intestine is regulated by hormones, stomach distension and muscular reflexes that influence the pyloric sphincter.
To learn more about digestion from the given link
https://brainly.com/question/21470803
#SPJ4
Answer: B) Both contain partially digested food.
Explanation: This is right on edge ik cuz i just did the quiz and got 100% thx to the person above.....hope this helps!! :D
How do we study life in biology?
There are several considerations a biologist makes when deciding how to study life. They determine what methods would be most appropriate, feasible, and by look at what research has previously been completed.
After lots and lots of reading, a biologist hopefully has enough knowledge on the topic to formulate relevant questions that will direct his/her study. Once a question or general research direction has been chosen, a biologist will need to determine the best way to answer those questions.
For example, a biologist needs to decide if the work is better suited to a lab or the field or an experiment. Studying how porpoises respond to seismic drilling would likely involve field work. Studying how English ivy responds to increased temperatures would likely involve an experiment in a laboratory. The question itself is often the most important factor that determines the study. Ideally, your methods should be the best possible way of answering your question.
To learn more about biology visit here ; https://brainly.com/question/28405832?referrer=searchResults
#SPJ4
pleasssse hellllp!!!!
Answer:
The answer is C.
Explanation:
causes of metabolic acidosis include: question 6 options: 1) ingestion of too much alcohol 2) excessive loss of bicarbonate ions 3) lactic acid accumulation 4) ketosis 5) all of these
The excessive loss of bicarbonate ions is the answer. Ketoacidosis, which is brought on by starvation and can result in metabolic acidosis, increases acid production. Increased acid production from aspirin overdose can result in metabolic acidosis.
Acidosis is brought on by excessive acid production that accumulates in the blood, excessive blood bicarbonate loss (metabolic acidosis), or an accumulation of carbon dioxide in the blood as a result of impaired lung function or reduced breathing (respiratory acidosis).Increased bicarbonate loss brought on by diarrhea might result in metabolic acidosis.
learn more about Metabolic acidosis here:
https://brainly.com/question/17031780
#SPJ4
Provide examples of biotic and abiotic factors that affect an organism's range.
Answer:
water air soil sunlight and minerals
Explanation:
The biodiversity and distribution of organisms within an ecosystem is due to both abiotic (non-living) and biotic (living) factors.
The following F1 cross is made: BBGg x Bbgg. Which is not a possible outcome in the F2 generation?
`When the cross of BBGg x Bbgg is made then in this situation the gametes that are formed from BBGg are BG,Bg and from Bbgg is Bg,bg are BBGg,BBgg,BbGg and Bbgg. The four outcomes are BBGg,BBgg,BbGg and Bbgg and the homozygously dominant and the recessive is absent.
What is homozygous ?It is the situation in which the same types of gametes are present.
In the cross of BBGg x Bbgg the gametes that are absent will be the homozygous dominant condition and the homozygous recessive as well. BBGg,BBgg,BbGg and Bbgg are the gametes that are all heteroygous.
Heterozygous condition is the condition in which different gametes are present that is different different situation is present and the gametes in the offspring are totally different.
Learn more about cross in genetics at :
https://brainly.com/question/16991762
#SPJ1
An organism that reproduces using binary fission, a type of asexual reproduction, creates an identical copy of a cell when
Answer: An organism that reproduces using binary fission, a type of asexual reproduction, creates an identical copy of a cell when the cell's DNA replicates and the cell divides, giving each cell an identical copy of DNA
Answer:
C.
the cell's DNA replicates and the cell divides, giving each cell an identical copy of DNA.
Explanation:
The energy-producing, or energy-storing, molecule is called
a.ATO
b.glucose
c.protein
Answer:
The anwser is B
Explanation:
Which of the following anatomical structures would not be involved in micturation ? A. the detrusor muscle OB. Cremaster muscle oc sensory and motor neurons D. Stretch receptors
The anatomical structure that would not be involved in micturition is cremaster muscle (Option B).
What is anatomical structure?Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures. The detrusor muscle, sensory and motor neurons, and stretch receptors are all involved in the process of micturition, while the cremaster muscle is related to the male reproductive system and not involved in micturition.
Thus, the correct option is B.
Learn more about anatomical structures: https://brainly.com/question/25153842
#SPJ11
Which statement describes crossing over as it occurs during meiosis?
The statement that describes crossing over during meiosis is crossing over is the exchange of genetic material between homologous chromosomes
What is meiosis ?Meiosis can be defined as a process where a single cell divides twice to produce four cells containing half the original amount of genetic information.
Therefore, During crossing over, two homologous chromosomes come together and exchange segments of genetic material. This occurs at specific regions called chiasmata. The result of crossing over is that each chromosome contains a unique combination of genes from both parents, increasing genetic diversity in the offspring.
Learn more about meiosis here :brainly.com/question/16249478
#SPJ1
Which president founded the environmental protection agency?.
Answer: I think it was Richard Nixon.
I'm not completely sure about it, but I hope this helps!! :)
Answer:
President Richard Nixon
Explanation:
President Nixon signed Reorganization Plan calling for the establishment of an Environmental Protection Agency
(PLESE HELP) A 100-m long ski lift carries skiers from a station at the foot of a slope to a second station 50 m above the base. What is the mechanical advantage of the lift?
500
2
0.5
40
Answer:
2
Explanation:
MA=l/h
The length is 100 and the height is 50
100/50=2
4. Exercise 3.4. Genetic Testing and Insurance Prices. Suppose the likelihood that a person will get disease X is determined in large part (but not exclusively) by his or her genes. Initially, it Is impossible to determine who carries the gene for the disease, and many people spend $500 on special health insurance to cover the costs of treatment for the disease. Suppose scientists uncover the gene responsible for the disease and develop a simple test for the gene. (Related to Application 3.) a. Suppose the government passes a law that prevents insurance companies from getting the results of a customer's genetic test for X. Will the new price of X insurance be greater that or less than $500 ? b. Suppose insurance companies have access to the results of genetic tests and they require all customers to get the test. How will the insurance company change its price of X insurance?
The first scenario's price of X insurance will be greater than $500, while the second scenario's price of X insurance depends on the results of the genetic test.
a) If the government passes a law that prevents insurance companies from getting the results of a customer's genetic test for X, the new price of X insurance will be greater than $500.
b) If insurance companies have access to the results of genetic tests and they require all customers to get the test, the insurance company will change its price of X insurance as follows: if the test shows that a customer has the gene, the insurance company will raise the price of insurance to $800 to cover the expected treatment cost of $10,000 (with probability 1). In contrast, if the test shows that a customer does not have the gene, then the insurance company will lower the price of insurance to $100 to cover only administrative costs, assuming there is no risk of developing the disease.
According to these two scenarios, the first scenario's price of X insurance will be greater than $500, while the second scenario's price of X insurance depends on the results of the genetic test.
Know more about Genetic Testing
https://brainly.com/question/30336854
#SPJ11
How do the cells of a multicellular organism differ from those of a unicellular organism?
O They never replicate.
O They are specialized.
They are all the same.
O They perform all functions.
Answer:
B: They are specialized
Explanation:
Multicellular organisms contain specialized cells which can perform more functions than unicellular organisms.
which is the correct
Identify the Mitotic phases.
Answer:
1 prophase, 2 metaphase, 3 anaphase, and 4 telophase.
Explanation:
Answer:
1= prophase
2= metaphase
3= anaphase
4= telophase
Explanation:
(because yes) hope this helps!
Which of the following are being used to build a better picture of climate variation over the past 1,000 years?
The following are being used to build a better picture of climate variation over the past 1,000 years are tree rings, glacial ice, and historic records.
Paleoclimatology is the study of ancient climates, which involves collecting information on climate from sources such as ice cores, tree rings, and sediment layers. These sources can offer important insights into past climate variations, which can help scientists predict future climate trends. Tree rings are being used to provide information about past climate conditions. The width of tree rings is affected by factors like rainfall, temperature, and sunlight, which can provide clues about the climate during the tree's lifetime.
Glacial ice is being used to study past climate conditions as it preserves a record of the atmospheric composition and conditions during its formation and ice cores are being extracted from glaciers in Antarctica and Greenland. These cores can provide detailed information about temperature changes and atmospheric conditions over thousands of years. Historic records are being used to provide information on past weather events, such as floods, droughts, and heatwaves. These records, which include diaries, weather logs, and newspapers, are being used to reconstruct past climate events, which can provide valuable information on past climate variations.
Learn more about paleoclimatology at:
https://brainly.com/question/14843418
#SPJ11