Answer:
Helper T cells are activated when they bind to their target antigen being displayed on an antigen-presenting cell. These cells then release what chemical? Cytokines, which is a chemical that signals B cells and other T cells to activate.
Helper T cells secrete cytokines to stimulate the proliferation of B cells.
What are Helper T- Cells?Helper T cells, also known as CD4+ T cells, are a type of white blood cell that play a critical role in the adaptive immune response. They are called "helper" cells because they help activate and coordinate other cells in the immune system, including B cells and cytotoxic T cells, to mount an effective response against a specific pathogen or foreign substance.
Helper T cells recognize and bind to antigens presented by antigen-presenting cells, such as dendritic cells, and then secrete cytokines that activate and differentiate other immune cells.
They also play a role in regulating the immune response to prevent excessive inflammation and tissue damage. Helper T cell dysfunction or depletion is associated with a number of autoimmune and infectious diseases.
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How do the oxygen (O2) and carbon dioxide (CO2) levels change over time?
What is always true about the total amount of O2 and CO2 in the test tube?
What happens when the CO2 reaches zero?
Answer:
Over a vast amount of time, millions of years, the earth gradually cooled. When the temperature dropped enough, water vapor condensed and went from a gas to liquid form. This created clouds. From these clouds, the oceans formed and the oceans absorbed a lot of the carbon dioxide in the atmosphere.
Explanation:
Which option(s) correctly describes chromosomes?
Chromosomes consist of tightly coiled DNA wrapped around proteins called histones
Each chromosome has one gene
Chromosome pairs contain completely different genes
Most human cells have two copies of each chromosome - one from each parent.
Answer:In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell is not dividing. However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope. Most of what researchers know about chromosomes was learned by observing chromosomes during cell division.
Each chromosome has a constriction point called the centromere, which divides the chromosome into two sections, or “arms.” The short arm of the chromosome is labeled the “p arm.” The long arm of the chromosome is labeled the “q arm.” The location of the centromere on each chromosome gives the chromosome its characteristic shape, and can be used to help describe the location of specific genes.
b cells that have been stimulated by interleukin-2 develop into _____.
What is the difference between an f donor and an hfr donor?.
Which type of resources form much more slowly than we use them? A: reusable B: renewable C: nonreusable D: nonrenewable
The type of resources from much more slowly than we use them is non-renewable resource. The correct option is D.
What are nonrenewable resources?A non-renewable resource is a natural resource that cannot be replaced quickly enough by natural means to keep up with consumption.
Carbon-based fossil fuels are one example. With the help of heat and pressure, the original organic matter is converted into a fuel such as oil or gas.
Nonrenewable energy sources are not only affecting our planet's atmosphere by increasing greenhouse gas emissions.
Coal and oil combustion emits particles that can pollute the air, water, and land. Some of these particles are captured and stored, but many are released into the atmosphere.
The use of fossil fuels also disrupts Earth's "carbon budget," which balances carbon in the ocean, earth, and atmosphere.
Thus, the correct option is D.
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Which two body systems control homeostasis?.
Answer:
The two body systems that control homeostasis are the nervous system and the circulatory system.
Explanation:
The nervous system controls everything you do, including voluntary and involuntary actions, and the circulatory system transports important nutrients to your cells to maintain a stable inner environment.
Which molecule is needed for photosynthesis to occur?
glucose
oxygen
carbon dioxide
nitrogen
Answer:
The answer is Carbon Dioxide/co2
Explanation:
For a clearer response, carbon dioxide is one of the substances needed for the process of photosynthesis. Oxygen is not essential because that molecule is what is being released. Glucose is the molecule being produced.
What are organelles.
Organelles are specialized structures that perform various jobs inside cells.
the dart thrower was throwing at the bullseye. what is the best description of this attempt?
Answer:
A. Accurate but not precise
Step-by-step explanation:
The illustration given shows that the was far from each other which means it is not precise because precision is that the given data must be close to each other. However, it is accurate because the darts are closer to the bullseye which can still be considered as accurate. Therefore, I believe this is accurate but not precise.
The best description of this attempt is that the dart thrower is aiming to hit the center of the target.
What is Dart thrower?A person who throws darts at a dartboard is known as a dart thrower. In the game of darts small missiles commonly referred to as darts are thrown at a circular target called a dartboard. Apart from being played in international competitions, the game is commonly played in bars or pubs. Each of the 20 numbered parts on a typical dartboard corresponds to a different score.
The goal of the game is to collect points by throwing darts at the board and hitting special spots to do so. The bullseye, located in the middle of the dartboard, awards the most points when hit. The popular sport and pastime requires precision, concentration and expertise.
Therefore, the best description of this attempt is that the dart thrower is aiming to hit the center of the target.
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Can someone help me please?
Answer:
The second arrow (the middle one)
Indicate whether the statements are true (T) or false (F). ___ A ribosome is the complex within which protein synthesis occurs.
Answer:
True
Explanation:
Body size in mice (length from nose to base of tail) is controlled in part by genetics. The following data shows the number of mice grouped by lengths:
Length Group Number of Mice
Very small (4-5 cm) 2
Small (5-7 cm) 6
Average (7-10 cm) 15
Large (10-12 cm) 7
Very large (12-13 cm) 1
Based on this data and your knowledge of inheritance patterns, identify the inheritance pattern that this trait follows in mice.
(1 point)
complete dominance
polygenic
incomplete dominance
pleiotropic
Answer:
polygenic!
Explanation:
Based on this data and your knowledge of inheritance patterns, identify the inheritance pattern that this trait follows in mice is polygenic.
What is Polygenic inheritance?Polygenic inheritance occurs when one character is controlled by two or more genes.
Often the genes are large in quantity but small in effect. Examples of human polygenic inheritance are height, skin colour, eye colour and weight.
Thus, option "B" is correct.
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Based on this diagram label the positive and negative sides of the DNA fingerprint with a + and – sign.
Answer:
?
Explanation:
What is a DNA fingerprint?
DNA fingerprinting is a method used to identify an individual from a sample of DNA by looking at unique patterns in their DNA.
Background
Almost every cell? in our body contains our DNA?.
On average, about 99.9 per cent of the DNA between two humans is the same.
The remaining percentage is what makes us unique (unless you are an identical twin!).
Although this might sound like a small amount, it means that there are around three million base pairs? that are different between two people. These differences can be compared and used to help distinguish you from someone else.
Minisatellites are short sequences (10-60 base pairs long) of repetitive DNA that show greater variation? from one person to the next than other parts of the genome?. This variation is exhibited in the number of repeated units or ‘stutters’ in the minisatellite sequence.
The first minisatellite was discovered in 1980.
DNA fingerprinting
DNA fingerprinting was invented in 1984 by Professor Sir Alec Jeffreys after he realised you could detect variations in human DNA, in the form of these minisatellites.
DNA fingerprinting is a technique that simultaneously detects lots of minisatellites in the genome to produce a pattern unique to an individual. This is a DNA fingerprint.
The probability of having two people with the same DNA fingerprint that are not identical twins is very small.
Just like your actual fingerprint, your DNA fingerprint is something you are born with, it is unique to you.
How was the first DNA fingerprint produced?
The first step of DNA fingerprinting was to extract DNA from a sample of human material, usually blood.
Molecular ‘scissors’, called restriction enzymes?, were used to cut the DNA. This resulted in thousands of pieces of DNA with a variety of different lengths.
These pieces of DNA were then separated according to size by a process called gel electrophoresis?:
The DNA was loaded into wells at one end of a porous gel, which acted a bit like a sieve.
An electric current was applied which pulled the negatively-charged DNA through the gel.
The shorter pieces of DNA moved through the gel easiest and therefore fastest. It is more difficult for the longer pieces of DNA to move through the gel so they travelled slower.
a freshwater plant is placed in a container of salt water what will most likely happen to cells of the plant
Answer:
They will shrink because water will move out of them.
Explanation:
They will shrink and it will cause the plant to die
The space that an organism in an ecosystem lives in is called a
A) community
B) population
C) habitat
D) niche
llo
Answer:
Answer C) Habitat.....
What does the independent
variable do?
Answer:
There are 3 types of variables you need to know
Independent Variable — what you keep the same (during an experiment)
Dependent Variable — what you measure (during an experiment)
Control Variable — what you change (during an experiment)
Axons from higher brain centers form motor tracts that descend from the brain into the white matter of the spinal cord and then synapse with somatic motor neurons in the ____________.
Motor output that is gotten from the spinal cord to skeletal muscles involves somatic motor neurons of the anterior gray horn. Many somatic motor neurons are regulated by the brain. Axons from higher brain centers form motor tracts that descend from the brain into white matter of spinal cord and then synapse with somatic motor neurons either directly or indirectly by first synapsing with interneurons that in turn synapse with somatic motor neurons.
Sensory receptors is known to detect sensory stimulus.
Sensory neurons often convey sensory input by nerve impulses through their axons. Their axon often start from sensory receptors into the spinal nerve and into posterior root.
From posterior root, axons of sensory neurons have 3 different choices of paths.
Axons of sensory neurons does start into the white matter of the spinal cord and moves up to brain as part of sensory tract.Axons of sensory neurons sometimes do moves into the posterior gray horn and synapse with interneurons that has its axons extend into the white mater of spinal cord and thereafter moves to brain as sensory tract.Axons of sensory neurons oftens moves into the posterior gray horn and synapse with interneurons which the synapse with somatic motor neurons.Axons that is gotten from spinal cord often synapse with other motor neurons in PNS.
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what organelle of a cell connect the nucleus and cell membrane of the cell?
Answer:
Endoplasmic Reticulum
Explanation:
I hope this helps!
Answer:
Endoplasmic Reticulum
Explanation:
have a nice day
How does carbon dioxide enter leaves?
Which part of the vascular system functions as a blood reservoir and contains over 60% of the body's blood
Answer:
Veins are also called capacitance vessels because they contain 60% of the body's blood volume.
Explanation:
Hope I could help.
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Which sequence of dna bases would pair with this partial strand cat tca ctg?.
Which of the following are molecules? (Select all that apply.)
K
MgCl2
H2
Mg
Grade -5-
Answer:
MgCI2
H2
Explanation:
any combination of elements is a molecule
Transformed bacteria are plated on LB plus ampicillin to determine which cells were successfully transformed. Which part of the pGLO plasmid is responsible for the growth of transformed cells despite the presence of ampicillin
Answer:
The gene that encodes ampicillin resistance.
Explanation:
The plasmid would contain the ampicillin resistance gene which gets expressed in the presence of ampicillin.
how does the cell make proteins inside the ribosome?
Answer:When the cell needs to make a protein, mRNA is created in the nucleus. The mRNA is then sent out of the nucleus and to the ribosomes. When it is time to make the protein, the two subunits come together and combine with the mRNA. The subunits lock onto the mRNA and start the protein synthesis.
At a ribosome, an intercellular structure made of both RNA and protein, the process of making proteins occurs in a cell. The messenger RNA sequence is read by the ribosome, which then converts the genetic code into a specific string of amino acids that develop into extended chains and fold to create proteins.
What are proteins?Proteins are defined as a macro- and large-scale biomolecules that contain one or more long chains of residues from the amino acid.
It is also defined as the results of the process of decoding, which begins with information in cellular DNA.
A protein is a biomolecule made up of peptide bonds that connect the amino acid residues in it.
There are seven types of proteins.
AntibioticsContractile proteinsEnzyme Hormonal proteinsStructural proteinsStorage proteinsTransport proteinsThus, the process of making proteins in a cell takes place at an intercellular structure called a ribosome, which is formed of both RNA and protein. The messenger RNA sequence is read by the ribosome, which then converts the genetic code into a specific string of amino acids that develop into extended chains and fold to create proteins.
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The tall allele is dominant and the dwarf allele is recessive. What is the abbreviation for the dwarf allele
Answer:
t
Explanation:
really just lowercase but I would you T,t because your talking about being tall or dwarf so you need to know that the T is tall and the t is dwarf
Hope this helped
which of these statements best describes the role of this enzyme in digestion
Answer:
One of the most important roles of enzymes is to aid in digestion. Digestion is the process of turning the food we eat into energy. For example, there are enzymes in our saliva, pancreas, intestines and stomach. They break down fats, proteins and carbohydrates.
Explanation:
hope this helps
Which soil-based compounds do plants use to create amino acids from glucose?
Answer:
Nitrates are the soil-based compounds plants use to create amino acids from glucose
Explanation:
Nitrates soil-based compounds do plants use to create amino acids from glucose.
state the expressed power you think is the most important and explain why you think it is the most important.
Answer:
The most important powers include the power to tax, to borrow money, to regulate commerce and currency, to declare war, and to raise armies and maintain the navy. These powers give Congress the authority to set policy on the most basic matters of war and peace.
Explanation: If I am wrong then i am sorry
29. The ABO blood type gene is an example of which means that heterozygous display two phenotypes at the same time.
A. Fading
B.Incomplete dominance
C. Codominance
D. Advanced hybridism
which best describes the sex chromosomes
sex chromosomes are the chromosomes which describe sex of an individual
female have teo X chromosomes and male have one X and one Y chromosome
