Conjugation
A) is the direct transfer of DNA from one bacterium to another.
B) occurs when a bacterium acquires DNA from the surrounding environment.
C) is the result of cell division.
D) occurs when a phage transfers bacterial DNA from one bacterium to another.
Answer: A
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An animal with an open circulatory system
a. lacks a continuous network of blood vessels that contain the blood at all times. b. can have only one heart. c. has two separate vascular circuits. d. is able to distribute substances faster than a closed system. e. can grow larger than one with a closed circulatory system.
During presentation of APC-bound antigen, macrophages and dendritic cells secrete the cytokine ________, which activates T helper cells.
A. histamine B. interleukin-2 C. interferon D. interleukin-1
Does cytokinesis differ between plant and animal cells?
What will be an ideal response?
Which physiological group of bacteria is a subset of the other?
a. Acetic acid bacteria are a subset of acetogens. b. Acetogens are a subset of acetic acid bacteria. c. Methylotrophs are a subset of methanotrophs. d. Methanotrophs are a subset of methylotrophs.