How many different kinds of nucleotides are in DNA?

A) Four B) Two
C) Hundreds or thousands D) Millions


A

Biology & Microbiology

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What occurs during the antigen detection stage of the antibody-mediated immune response initiated by T cell activation?

a. Cytotoxic T cells destroy body cells that are infected with a pathogen b. Helper T cells activate an antigen-specific B cell to divide and secrete antibodies. c. A T cell displaying an antigen-specific T cell receptor (TCR) binds to the antigen on the surface of an antigen presenting cell. d. Helper T cells are activated by the TCR. e. A B cell degrades the pathogen and produces antigens.

Biology & Microbiology

Rotational movement of the head is sensed by the ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

A solution with a pH of 3 is highly ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Region of a cell between the nucleus, or the nucleoid region of a bacterium, and the plasma membrane; contains the organelles of the cell.

What will be an ideal response?

Biology & Microbiology