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DerKrebs [107]
3 years ago
8

There are many different categories of T-cells that carry out various roles for the immune system. Differentiation for most T-ce

lls occurs during the T-cell maturation, but some differentiation occurs after maturation following antigen presentation. One category of T-cells functions in antigen presentation and activation of B cells, as well as the activation of cytotoxic T-cells and macrophages. What is this category of T-cell? A) Helper T B) Memory T C) Regulatory T D) Natural Killer T
Biology
2 answers:
Likurg_2 [28]3 years ago
7 0

Answer:

The answer is actually B) Memory T. Memory T cells rapidly produce large numbers of effector T-cells when re-exposed to their antigens, which provides the immune system  memory against past infections.

kobusy [5.1K]3 years ago
5 0

Answer:

The answer is A.)Helper T cells

Explanation:

I got this question on USA Test Prep and this was the right answer. Hope this helps!

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A segment of a DNA molecule has the base sequence ATGAAC. Write a shorthand structure for this segment and for its complementary
Zanzabum

Answer: See attached picture.

Explanation:

DNA or deoxyribonucleic acid is the name for the molecule that contains the genetic information in all living things. This molecule consists of two strands that wind around each other to form a double helix structure.

The basic unit of nucleic acids are called nucleotides, which are organic molecules formed by the covalent bonding of a nucleoside (a pentose which is a type of sugar and a nitrogenous base) and a phosphate group. So each nucleotide is made up of a pentose sugar called deoxyribose, a nitrogenous base which can be adenine (A), thymine (T), cytosine (C) or guanine (G) and a phosphate group.

<u>What distinguishes one polynucleotide from another is the nitrogenous base</u>, and thus the sequence of DNA is specified by naming only the sequence of its bases. The sequential arrangement of these four bases along the chain is what encodes the genetic information, following the following criterion of complementarity: A-T and G-C. So the sequence of these bases along the chain is what encodes the instructions for forming proteins and RNA molecules. In living organisms, DNA occurs as a double strand of nucleotides, in which the two strands are linked together by connections called hydrogen bridges.

The chemical convention of naming the carbon atoms in the pentose nucleotide pentose numerically confers the names 5' end and 3' end ("five prime end" and "three prime end" respectively). The 5'-end designates the end of a DNA strand that coincides with the phosphate group of the fifth carbon of the respective terminal deoxyribose. A phosphate group attached to the 5'-end allows the ligation of two nucleotides; for example, the covalent bonding of the 5'-phosphate group to the 3'-hydroxyl group of another nucleotide, to form a phosphodiester bond.

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3 years ago
The nucleus contains genetic information which controls and gives the cell _________________ about what to do.
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Answer:

please give me brain list and follow

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The main function of the cell nucleus is to control gene expression and mediate the replication of DNA during the cell cycle. The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell's genetic material.

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2 years ago
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