Once human nerve cells become mature, they normally exit the cell cycle and remain in ____
a. G0
b. G1
c. G2
d. S phase
e. prophase
ANSWER: a
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A. attack of cells by bacteriophages B. the phases through which cells pass during division C. the disintegration of a cell D. the attachment of protist cells to a substrate E. the capture of food particles by a cell
Plant hormones bind specific cellular receptor molecules that trigger gene expression responses. Which statement is correct concerning these responses?
A. Only cells lacking receptors can bind hormones. B. Only cells in the meristem can respond. C. Only cells that express the appropriate receptors can bind hormones. D. Only cells that have been previously activated can bind hormones. E. None of these choices is correct.
What are organized clusters of membrane proteins that selectively allow substances to cross into and out of the nucleus?
a. nuclear pore b. passive transport protein c. receptor d. nuclear envelope e. ribosome
Trisomy of which pair of chromosomes has the greatest chance of survival?
A. pair 8 B. pair 15 C. pair 13 D. pair 3 E. XX