The recombination and independent assortment in meiosis lead to the genetic variation in sexual reproduction.
By combining different gene variations, meiosis and fertilization produce genetic variety (alleles). The raw materials for natural selection are sometimes provided by these new combinations, which may make an organism more or less fit (able to survive and reproduce).
Offspring through sexual reproduction could have a very diverse genetic makeup. This variety results from random gamete union during fertilization as well as independent assortment and crossing-over during meiosis. Sibling genetic diversity is a result of sexual reproduction as well. Only one chromosome from each homologous pair is randomly included when a parent creates a gamete. Therefore, compared to its siblings, a child may inherit a distinct set of chromosomes (and alleles).
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what makes up steroids? to what group of organic compounds do steroids belong? how are they used in animals?
Steroids are made from 4 fused carbon organic compounds rings, they are lipids, they are hormones in animals.
Steroids are synthetic versions of hormone-like substances that the body naturally produces. These steroid hormone medications are frequently created as pellets or "implants" that are inserted beneath the skin on the animal's ear's back. steroid is no need to remove the implants because they progressively organic compounds disintegrate under the skin. The treated animals' ears are not eaten as food for animals and are discarded at the time of slaughter. The group of biochemicals known as lipids includes steroids. They are organic compounds that are extremely soluble in nonpolar organic solvents but insoluble in water.
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bald eagles, which feed mainly on fish, tend to have much higher concentrations of toxins than the fish have. the same situation occurs for many top predators. this phenomenon is referred to as
Bald eagles have higher concentrations of toxins than fish this phenomenon is referred is called biomagnification.
What is Biomagnification?The buildup of the chemical DDT in zooplankton is one instance of biomagnification in action, this zooplankton is consumed by little fish.
When slightly bigger creatures known as zooplankton eat the contaminated phytoplankton.
Therefore, absorb POPs into their own tissues at a greater concentration, the process is known as biomagnification.
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6th grade lab answering: how does the concentration of solutes affect the movement of water into or out of cells?
Due to the process of osmosis, the concentration of solutes affects the movement of water into or out of cells were, the higher the concentration of a solute, the faster the rate of osmosis. This happens because in a semi-permeable membrane of the cell wall the water is the only through that can move through.
The rate of osmosis is influenced by a solute's concentration over time; the higher the concentration, the faster the rate of osmosis. This occurs because the only substance that may pass through a semi-permeable membrane is water. Since sugar is the solute in this instance, it cannot pass through the membrane's pores. The difference in concentration is greater when there is more sugar present. Every molecule wants to travel more quickly as a result of this disparity. As a result, osmotic pressure increases. The membrane's pores prevent the sugar from passing through, despite its attempts. This indicates that because more sugar is obstructing the pores, the water can only pass through fewer of them. The little water that does pass through the pores clumps up close to the open holes and rushes inside the membrane more quickly as a result. As a result, osmosis happens more quickly.
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Explain how milk production in a lactating mother is an example of positive feedback.
Answer: An newborn sucking creates prolactin, which causes the production of milk; more sucking results in more prolactin, which causes more lactation. This is a positive feedback mechanism because the milk's ability to increase suckling and hormone production.
Explanation:
scavenger hunt the egyptian hieroglyphic system of numeration, one of the oldest and most primitive types of numeration systems, dates back to when?
Perhaps the first civilization to use the scientific arts was the ancient Egyptians. In fact, the word "chemistry" comes from the word "alchemy," which is another name for Egypt in antiquity.
In the fields of applied mathematics and medicine, the Egyptians truly excelled. There is a substantial corpus of papyrus literature that describes their successes in medical, but no documentation exists for how they arrived at their mathematical results. Their achievements in engineering, astronomy, & administration could not have been feasible without having a thorough comprehension of the topic.Perhaps the first civilization to use the scientific arts was the ancient Egyptians. There are around 1100 hieroglyphic images, including over 650 from the Collins list and 450 instances of Egyptian words. Egyptian Hieroglyphics provides in-depth details on the development of Egyptian mathematics and writing, as well as information on the usage of various symbols, how to write one's name, how to identify monarchs' names, and the legend of the scribe, complete with a video.
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suppose that a single dna base change of an ""a"" to a ""t"" occurs and is copied during replication. is this change necessarily a mutation?
The DNA sequence has changed, that much is certain. when a single "a" to "t" DNA base mutation takes place and is replicated during replication.
A base, or base-pair, substitution is the term used to describe this kind of mutation. Base substitutions involving the switching of one pyrimidine for another or a mismatched A-A pair for an A-T pair are referred to as transitions; the switching of a purine for a pyrimidine or vice versa is referred to as a transversion. A mutation is a change in our DNA sequence that results from environmental influences like UV radiation and cigarette smoke or mistakes made when the DNA is duplicated.
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the evolution of the notochord in chordates permitted a more complex embryonic development.
The notochord's evolution in chordates allowed for a more complicated embryonic development. The assertion is accurate.
The importance of a notochord in the chordate lineage is that it facilitated the emergence of a more sophisticated neural system. segmentation is no longer necessary. facilitated the organism's expansion. gave muscles a place to connect inside. The development of chordates, which include amphioxus, tunicates, and vertebrates, is characterized by the presence of a notochord, while it is also possible that certain other species possess one. Although notochords have been thoroughly evaluated from a developmental genetic perspective, there hasn't yet been a thorough examination of the around a dozen hypotheses that explain for their evolutionary origin.
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Structure (b) is a ____.
Chromosome
centromere
chromatid
Answer:
Explanation:
a chromatid
Consider a phylogenetic tree of the Chordates. Suppose lancelets lacked a gene found in tunicates and vertebrates. Would this imply that the chordates’ most recent common ancestor also lacked this gene? Explain.
which mineral is a component of atp, dna, and rna, a component of the mineral complex hydroxyapatite in bone, and is abundant in our food supply?
Phosphorus is a component of atp, dna, and rna. And, yes, Phosphorus is so available in the food supply, there's a lot of natural foods with phosphorus in it, like dairy's, red meats, poultry's, seafoods, legumes, and ect, this is called organic phosphorus.
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which compound(s) formed in the body during diabetes alters protein structures and stimulate damaging metabolic pathways?
Methylglyoxal (MGO), advanced glycation end products (AGEs) and reactive oxygen species (ROS) alter protein structure and are damaging in diabetes.
ROS formation is strongly implicated in the relationship between mitochondrial dysfunction and insulin resistance. ROS generation occurs mainly in complexes I and III of ETCs and increases when ETCs cannot cope with excessive electron input.
Under these circumstances, as a result of nutrient overload, the electron supply to the mitochondrial ETC increases and excess electrons transfer to oxygen to produce O2- and then hydrogen peroxide. Mitochondrially-generated ROS oxidize residues of proteins, damaging protein structure and impairing their function, ultimately leading to cell death.
ROS species also damage DNA and membrane lipids, thereby promoting mitochondrial dysfunction.
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is a stretch of dna consisting of an operator, a promoter, and genes for a related set of proteins, usually making up an entire metabolic pathway.
Operon is a stretch of DNA consisting of an operator, a promoter, and genes for a related set of proteins, usually making up an entire metabolic pathway.
A grouping of genes along the DNA that code for functionally similar proteins is known as an operon and is a genetic regulatory mechanism that is present in bacteria and their viruses. Because of this property, protein production can be coordinated to meet the demands of the cell.
An operon is a collection of genes that are all translated into the same mRNA and share a common promoter. Operons come in two different varieties: lac and trp. The lac operon is an inducible operon that is present in Escherichia coli and encodes the genes involved in the catabolism of lactose.
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plants grow taller through mitosis at the tips of their shoots (above ground) and at the tips of their roots (below ground). here are two samples of tissue taken from a grass plant, one from the tip of the root and one from the mid part of the plant. what can you conclude from these data
Metaphase lasts about twice as long as anaphase is a fact that we can conclude from these data.
A stage of cell division is called metaphase (mitosis or meiosis). Typically, each chromosome is dispersed throughout the cell nucleus. The nucleus of the cell disintegrates during metaphase, and the chromosomes gather and travel toward the center of the dividing cell.
When studied under a microscope at this point, the chromosomes may be distinguished. In the laboratory procedure of karyotyping, defective chromosomes are found by using metaphase chromosomes.
Many years before we realized what that genetic material was, the ability to observe chromosomes under a microscope in metaphase allowed us to identify them as having the genetic material. Later research revealed that chromosomes are composed of DNA and proteins, and that DNA encodes the genetic information contained inside each chromosome.
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identify the following as either causes or effects of domestication. keep in mind that some choices might be both causes and effects.
True:
The domestication of plants and animals took place over centuries.
The domestication of plants and animals was very rapid compared to the evolution of language, bipedalism, or other major biological changes.
False:
The domestication of plants and animals occurred at about the same time, in one region (southwest Asia), and spread from there.
The domestication of plants and animals had nothing to do with climate change.
Cause of domestication : Natural climate change, Population growth.
Effect of domestication : Development of cities, Population growth.
Domestication is the process of domesticating wild plants and animals for human consumption. Domestic animals are kept for food, work, clothing, medicine, and a variety of other purposes. Humans must raise and care for domesticated plants and animals. Domesticated species do not exist in the wild. Domesticated species' evolutionary changes not only increase yields but can also alter agricultural impacts by enabling further intensification (e.g., higher concentrations due to the evolvement of erect crop structure), enabling growth into previously unfavorable habitats.
Domestication has had a significant impact on crop genetic diversity, with the domesticate having tolerably lowered genetic diversity comparative to the wild ancestor across the genome and dramatically reduced diversity for genes targeted by domestication.
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which protein is found in the a band of a myofibril and which protein is found in the i band?
Actin, myosin, titin, and other lengthy proteins make up myofibrils, which are held together by other proteins. The Z line, a disk of the protein -actinin, is where the I bands are concentrated.
The morphological unit of skeletal muscle's contractile system is called a myofibril. The muscle fiber, which has a diameter that varies from 30 to 150, is made up of many myofibrils that have a diameter of approximately 1 and are encircled by the sarcoplasmic reticulum network. Troponin, tropomyosin, and thin actin filaments make up I bands. Myosin, the protein, makes up thick filaments. In addition to other proteins, the A band is made up of overlapping thin and thick filaments.
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what strategy, taken to an extreme in organisms like humans and elephants, can increase an organisms fitness because, from the perspective of evolution, children must survive to the age of reproduction?
In species like humans and elephants, the use of excessive parental care can improve an organism's fitness.
Care can be advantageous if parents (1) increase offspring survival during the stage in which parents and offspring are connected, (2) enhance offspring quality in a way that increases offspring survival and/or reproduction in the future when parents are not connected with offspring, and/or (3) directly...
Parental care - which is defined as any parental behavior or adaptation that improves the fitness of the offspring, frequently at some cost to the caregiver, exhibits striking diversity among species, ranging from short-term and relatively simple behaviors, like egg attendance, to long-term and elaborate adaptations, like some forms of food.
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ethidium bromide is a dye that is used to stain the gel and allows the dna to be viewed under uv light. t or f
When applied as a stain, the fluorescent substance ethidium bromide inserts itself between base pairs. This has the disadvantage of being exceedingly poisonous.
Why is the gel stained with ethidium bromide?When separating DNA fragments by agarose gel electrophoresis, ethidium bromide (EtBr) is occasionally added to the running buffer. It is employed because the DNA banding pattern may be seen once the molecule binds to the DNA and is illuminated by a UV light source.
What mechanism does ethidium bromide use to alter DNA?Ethidium bromide alters DNA, which results in mutations. A flat, planar chemical called ethidium bromide has a ring structure that resembles a pair of DNA bases. Because of its distinct structure, EtBr can intercalate or insert itself between stacked bases in double-stranded DNA.
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describe the three structural components of an rnarna nucleotide monomer. explain the role of rnarna polymerase during transcription.
The RNA nucleotide monomer's three structural components are a phosphate group, four nitrogenous bases, and a 5-carbon sugar.
A single-stranded nucleotide, RNA, or ribose nucleic acid, is transcribed from DNA. During transcription, the structural RNA components and the polymerase play a crucial role in initiating gene expression.
The functions are stated as follows:
1. The RNA nucleotide monomer's three structural components are a phosphate group, four nitrogenous bases, and a 5-carbon sugar. The nucleotide is made up of these three parts.
2. During transcription, RNA polymerase examines the transcription process and the data inserted into the new messenger RNA molecule. The first step in controlling gene expression is transcription, and RNA synthesis helps copy genetic information from DNA to RNA.
Consequently, RNA consists of three units, and gene expression is controlled by the polymerase.
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which include fats, store energy that can be broken down to yield large amounts of energy.
Fats are a type of lipid that serve as energy stores and can be converted into enormous amounts of energy.
Ingested triglycerides begin to break down into shorter chain fatty acids and then into monoglyceride molecules in the colon thanks to pancreatic lipases, which break down lipids after they have been emulsified by bile salts.
When food enters the small intestine as chyme, intestinal cells in the intestinal mucosa release the digestive hormone cholecystokinin (CCK). The gallbladder constricts as a result of the pancreas releasing pancreatic lipase, which causes the stored bile salts to be released into the gut. CCK also travels to the brain, where it can act as an appetite suppressant.
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Cell division. How and why does it happen? Cells can make exact copies through a process called mitosis. The parent cell undergoes DNA replication and makes a copy; same DNA, same chromosome number. Some simple organisms use mitosis as a method of asexual reproduction, but there is a disadvantage: no genetic variation. When organisms began undergoing sexual reproduction, there needed to be a way for parent cells to combine DNA in their offspring, hence facilitating genetic variation. Meiosis. In this process, DNA replication still takes place, but instead of two identical cells with the same DNA and chromosome number, four daughter cells are produced with half the chromosome number. We call these cells gametes. When gametes combine via fertilization, there is a new genetic combination and the chromosome number is restored.
Compare the two processes: mitosis and meiosis. Can you identify the the true statements about the two? (Choose 4)
Responses
A
There are four haploid daughter cells produced by meiosis. A mitosis produces four daughter cells that are diploid.
What are daughter cells?Daughter cells are defined as when a cell divides by mitosis, genetically identical cells are created. Genetically identical to both the original parent cell and the two daughter cells created during mitosis.
Mitosis comprises the division of body cells, as opposed to meiosis, which involves the division of sex cells. A cell divides twice during meiosis as opposed to just once during mitosis. Following mitosis and cytoplasmic division, two daughter cells are created, whereas four daughter cells are created after meiosis.
Thus, there are four haploid daughter cells produced by meiosis. A mitosis produces four daughter cells that are diploid.
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Your question is incomplete, but probably your complete question was
Cell division. How and why does it happen? Cells can make exact copies through a process called mitosis. The parent cell undergoes DNA replication and makes a copy; same DNA, same chromosome number. Some simple organisms use mitosis as a method of asexual reproduction, but there is a disadvantage: no genetic variation. When organisms began undergoing sexual reproduction, there needed to be a way for parent cells to combine DNA in their offspring, hence facilitating genetic variation. Meiosis. In this process, DNA replication still takes place, but instead of two identical cells with the same DNA and chromosome number, four daughter cells are produced with half the chromosome number. We call these cells gametes. When gametes combine via fertilization, there is a new genetic combination and the chromosome number is restored.
Compare the two processes: mitosis and meiosis. Can you identify the the true statements about the two? Meiosis results in four haploid daughter cells. Mitosis results in four diploid daughter cells. In both processes, DNA replication must occur. During meiosis the 2N mother cells produces N daughter cells. Mitosis is responsible for genetic continuity; in higher organisms it is essential for growth and repair. In plants, egg and sperm are produced via mitosis.
what is binomeol nomeclature in biology
Answer:the system of nomenclature in which two terms are used to denote a species of living organism, the first one indicating the genus and the second the specific epithet
Explanation:
all sensory information passes through which portion of the diencephalon before reaching the sensory cortex?
thalamus was the portion of sensory cortex that is responsible for passing all the sensory information through the diencephalon.
what is diencephalon ?
The diencephalon is a division of the forebrain (embryonic prosencephalon). It is located between the telencephalon and the midbrain . In ancient literature, the diencephalon was sometimes called as the 'tweenbrain. It is made up of components on each side of the third ventricle, including the thalamus, hypothalamus, epithalamus, and subthalamus.
The diencephalon is one of the primary vesicles of the brain that develops throughout embryogenesis. During the third week of development, a neural tube is formed from the ectoderm, one of the three basic germ layers. During the third week of development, the tube generates three major vesicles: the prosencephalon, mesencephalon, and rhombencephalon. The prosencephalon progressively separates into the telencephalon and diencephalon.
The thalamus is the region of the sensory brain that is in charge of transferring all sensory information through the diencephalon.
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regulation of the trp operon of e. coli would be best described as using the mechanism: a. positive control by inactivating an inducer b. rapid degradation of mrna before translation can occur c. regulation outside the nucleus by alternative mrna processing d. co-transcription / translation e. a combination of operators and enhancers
The regulation of the trp operon of Escherichia coli is a complex biological process that involves multiple mechanisms. Among them, the most important are: a) Positive control by inactivating an inducer, b) Rapid degradation of mRNA before translation can occur, c) Regulation outside the nucleus by alternative mRNA processing, d) Co-transcription / translation and e) A combination of operators and enhancers.
The trp operon is first regulated by a positive control system that inactivates an inducer. This control system requires the binding of an inducer to a repressor molecule in order to switch off gene expression.
The second mechanism used to regulate the trp operon is rapid degradation of mRNA before translation can occur. This degradation process is necessary to ensure accurate expression of the trp operon.
The third mechanism used to regulate the trp operon is regulation outside the nucleus by alternative mRNA processing. This process is used to ensure that the correct mRNA is produced, which is needed for the accurate expression of the trp operon.
The fourth mechanism used to regulate the trp operon is co-transcription / translation. This process is used to ensure that the correct mRNA is translated into the correct proteins.
Finally, the fifth mechanism used to regulate the trp operon is a combination of operators and enhancers. This process involves the use of multiple regulatory elements to control the expression of the trp operon.
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As with an inner join, an outer join using multiple tables with a many-one-many relationship will not create a valid dynaset using only one query.
a. True
b. False
The statement is false. An outer join using multiple tables with a many-one-many relationship can create a valid dynaset using only one query.
What is an outer join?
An outer join is used to combine rows from two or more tables, even if there is no match between the rows in the tables. In a many-to-one-to-many relationship, there can be multiple records in one table that correspond to a single record in another table. An outer join can be used to include all the records from both tables, including those that do not have a match in the other table.
In SQL, an outer join can be expressed using the LEFT OUTER JOIN or RIGHT OUTER JOIN syntax. The LEFT OUTER JOIN returns all the records from the left table and the matching records from the right table, or NULL values if there is no match. The RIGHT OUTER JOIN returns all the records from the right table and the matching records from the left table, or NULL values if there is no match.
Therefore, it is possible to use an outer join with multiple tables in a many-to-one-to-many relationship to create a valid dynaset using only one query.
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FILL IN THE BLANK. __________ consists of showing favoritism toward one gender over the other.
Gender Bias is the phenomenon that consists of showing favoritism toward one gender over the other.
Gender Bias is the preference of a certain gender over the other. It is considered as a form of unconscious bias or implicit bias. For example, when considering the occupations like doctor or engineer, they are more relate with the males. While teaching is considered to be a profession for females.
Gender refers to the personal identity of an individual. Earlier there were majorly 2 defined genders: male and female. However, there are various other genders like Intersex, Trans, Non-Conforming, bigender, Cis-gender, Pangender, etc.
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what characteristic of seismic waves did scientists use to determine the differences between the layers of the earth?
Scientists can tell by observing the seismic waves that are recorded all over the surface of the earth from distant earthquakes. The seismic waves are reflected (bounced off) layers of different density, and they are refracted (bent) when they enter layers of different density.
characteristic of seismic waves are as follow:
shock waves generated by earthquakes and explosions that travel through Earth and across its surfaceto reveal the structure of the interior of the planetBody waves are the type of waves that are useful for seismologist in their study of the earth's interior because they are the only type of waves that give information about the deep interior of the Earth. Body waves have two types, the P waves and the S waves.
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How do you evaluate the validity and reliability of different sources of information on the classification of organisms?
When evaluating the validity and reliability of different sources of information on the classification of organisms, it is important to consider the source of the information.
What is classification of organisms?Classification of organisms is the process of grouping living organisms into categories based on their physical or genetic characteristics. Organisms are classified into different ranks, or levels, based on their shared characteristics and evolutionary relationships. The most commonly used system of classification is the Linnaean system, which groups organisms into species, genus, family, order, class, phylum, and kingdom. This system is based on the idea that organisms that share more characteristics are more closely related than those with fewer shared characteristics.
For example, information from reliable sources such as scientific journals, peer-reviewed studies, and authoritative websites may be more reliable than information from less reliable sources such as blogs, opinion-based articles, or social media. Additionally, it is important to consider the accuracy of the information and its relevance to the topic. For example, if the source of information is outdated or doesn’t contain the most recent information, then it may not be reliable. Additionally, it is important to consider the context of the information in order to assess its validity. For instance, if the classification information is being used to make a scientific or medical decision, then it must be accurate and up-to-date. Finally, it is important to consider the language of the source in order to determine its accuracy. If the language is technical or difficult to understand, then it may not be reliable.
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Select the characteristics of biofilms that differentiate them from planktonic bacteria. check all that apply.
a. Microorganisms live singly and independently.
b. Microorganisms participate in quorum sensing.
c. Microorganisms secrete extracellular material, usually polysaccharide, that forms a matrix.
d. Microorganisms are readily eradicated using antibiotics
e. Microorganisms exist as part of a diverse interdependent community
The characteristics of biofilms that differentiate them from planktonic bacteria are a, b, c, e
a. Microorganisms live singly and independently.
b. Microorganisms participate in quorum sensing.
c. Microorganisms secrete extracellular material, usually polysaccharide, that forms a matrix.
e. Microorganisms exist as part of a diverse interdependent community
Planktonic bacteria are free-dwelling micro organism. they are the populations that grow in the acquainted check tube and flask cultures in the microbiology laboratory. the other mode of increase is the adherent, or sessile, kind of increase. Planktonic micro organism had been diagnosed for centuries.
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explain how helper t cells of the immune system communicate with antigen presenting cells using cell-to-cell contact
The antigen-presenting cell will consume bacteria before displaying an antigen fragment on its surface. The helper t cell possesses receptors that attach to the antigen, which causes that helper t cell to become activated.
Immune cells include helper T-cells. They alert other immune cells to an infection so they can combat it. They may trigger the production of antibodies by B-cells or cytotoxic T-cells. One of the most significant cell types in your adaptive immune response are your helper T-cells.
Since they are necessary for practically all adaptive immune responses, helper T cells are arguably the most significant cells in adaptive immunity. They aid in the activation of cytotoxic T cells, which kill infected target cells, as well as B cells that generate antibodies and macrophages that kill ingested microorganisms.
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what is the effect of sequential infections with variants of influenza virus on the nature of the antibody response that is stimulated?
The effect of sequential infections with variants of influenza virus on the nature of antibody response is that body creates specific antibodies to fight the disease during next encounter.
Influenza virus is commonly known as flu. It is caused in both humans and birds. It has the potential to affect nose, lungs and throat. They are transferred through infected airborne droplets. After suffering from flu, the body's immune system develops antibodies which effectively recognize and bind to antigenic sites which are found on virus proteins. When two flu viruses are antigenically different, this means that a host’s immune response (antibodies) elicited by infection or vaccination with one of the viruses will not as easily recognize and neutralize the other virus.
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