At what phase of the cell cycle does p53 halt cell division if it senses DNA damage?

A. S
B. G2
C. M
D. G0
E. G1


E. G1

Biology & Microbiology

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The first human infected by HIV appears to have contracted it from butchering and eating a ________

a. chimpanzee b. mountain gorilla c. cane rat d. brush-tailed porcupine

Biology & Microbiology

A keystone species

a. has a disproportionately large effect on a community relative to its abundance. b. controls the prey species. c. may increase or decrease the number of prey species in a community. d. has a disproportionately large effect on a community relative to its abundance and may increase or decrease the number of prey species in a community. e. has a disproportionately large effect on a community relative to its abundance, controls the prey species, and may increase or decrease the number of prey species in a community.

Biology & Microbiology

Generally, r-selected organisms exhibit:a

short life spans and early maturity. b. long life spans and extended parental care of offspring. c. long development time to maturity, but small body size. d. large body size and extended parental care of offspring. e. large body size, but short life spans.

Biology & Microbiology

Enzymes that are secreted by a cell to catalyze hydrolysis reactions are

A) Exoenzymes B) Endoenzymes C) Constitutive enzymes D) Regulated enzymes E) Apoenzymes

Biology & Microbiology