Many of the specific functions that are triggered when a cell passes one of the cell cycle checkpoints result from activation of enzymes and other proteins. A common mechanism for this activation is:
A. phosphorylation of specific proteins.
B. signal transduction.
C. polymerization of tubulin.
D. ATP synthesis.
A
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The strand of DNA for a particular gene that is copied by the RNA polymerase to form mRNA is called the ________ strand.
A. copy B. transcription C. template D. leading
Some sponges are vital in recycling what particular nutrient back into the marine environment?
a. Calcium b. Silica c. Nitrogen d. Potassium
Select all correct descriptions of changes that occur to the circulatory system of a pregnant woman.
e. increased renin-angiotensin-aldosterone activity d. relaxation of the smooth muscle in arteries c. increased blood volume d. All of the above
In most prokaryotes, DNA replication proceeds
a. without an RNA primer. b. 3? to 5?. c. using only a single strand as a template. d. bidirectionally.