When light energy hits a photopigment, the molecule
A) is separated from the plasma membrane.
B) is destroyed, setting off a series of chemical reactions.
C) forms an enzyme.
D) changes shape, setting off a series of chemical reactions.
E) generates an action potential.
D
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Plants and streptophyte algae share a number of derived traits, except
A. plasmodesmata. B. sexual reproduction. C. chlorophyll a and b. D. a distinctive type of cytokinesis. E. cellulose-rich cell walls.
If during a chemical reaction, a molecule loses hydrogens, it could be described as being oxidized
a. True b. False
Regulation of the cell cycle is dependent on cyclins and cyclin-dependent kinases. The key(s) that allows a cell to progress beyond the restriction point is (are)
a. Cdk1 and cyclin B. b. cyclin D and p21. c. cyclin A and Cdk2. d. phosphorylation of RB by Cdk4 and Cdk2. e. external signals from growth factors.
Which of the following substances is commonly used to inactivate microbes?
A. formaldehyde B. alcohol C. synthetic detergents D. fluorescent dyes E. alum