If a cell's DNA becomes damaged by radiation or chemicals, it is unlikely to ____
a. pass the G2 checkpoint
b. synthesize cyclin-dependent kinases
c. enter G1 from mitosis
d. become arrested in G1
e. activate DNA repair mechanisms
A
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In terms of structure, most leaves are _______________, with a high _______________ to _______________ ratio
Fill in the blank(s) with correct word
All of the following can contribute to desertification
EXCEPT a. drought. b. overplowing. c. overgrazing. d. farming in areas with high winds. e. all of these.
A transmembrane protein differs from other membrane proteins because it:
a. is covalently linked to the outer surface of the plasma membrane. b. is a glycoprotein with carbohydrates attached. c. is attached to the inside of the membrane by an ionic bond. d. completely extends through the membrane. e. is completely embedded within the membrane
Cells get their energy from the ________ of molecules, such as ATP, that store energy
Fill in the blank(s) with correct word