Which of these reasons for cell division goes beyond the normal requirements for it?
A) To make new immune cells when the organism is sick
B) To replace old cells
C) To make extra copies of DNA to store for later use
D) To make new cells as the organism grows
E) To repair damaged tissue
Answer: C) To make extra copies of DNA to store for later use
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One way to study a microbial ecosystem is to isolate microorganisms from it and study their properties in laboratory culture
Indicate whether the statement is true or false.
In sponges, the cells responsible for generating water currents that facilitate gas exchange and nutrition are the
A. choanocytes. B. spicules. C. mesohyl. D. sperm. E. symbionts
Which of the following is not true of the reactions that methylate the 5' end of the primary mRNA transcripts?
A. The reaction occurs after the entire transcript is synthesized. B. The methyl groups are derived from S-adenosylmethionine. C. The enzymes that catalyze the reactions are guanylyltransferases. D. The enzymes that catalyze the reactions are associated with the C-terminal domain of RNA polymerase II.
Sometimes the most abundant color form of an animal is preyed upon more extensively than less common forms. This
illustrates the phenomenon of ____ selection.
a. stabilizing b. directional c. disruptive d. frequency-dependent e. artificial