At what checkpoint(s) does the cell arrest in response to DNA damage?

A. spindle
B. G1/S
C. G1/S and G2/M
D. G2/M and spindle
E. G2/M


Answer: C

Biology & Microbiology

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Energy from sunlight can excite electrons, kicking them out of their orbitals and creating free radicals. Free radicals are highly reactive atoms or molecules that have unpaired electrons and degrade and destroy other compounds in their vicinity

Carotenoids, one of the pigments present in most chloroplasts, can stabilize these free radicals. This suggests that _____. A) once chloroplasts are destroyed, the free radicals will destroy the cell B) carotenoids probably have a protective function in the cell C) free radicals induce the synthesis of carotenoids in chloroplasts D) carotenoids communicate directly with the immune system of plants

Biology & Microbiology

On a molecular level, all organisms

a. show no similarities. b. have the same bases in DNA and RNA, the same amino acids in proteins, but use different genetic codes. c. use different means of storing genetic information. d. have the same bases in DNA and RNA, the same amino acids in proteins, and use the same genetic code. e. have the same bases in DNA and RNA, but different amino acids in proteins.

Biology & Microbiology

Which of these cell parts is NOT paired correctly with its function?

A. Nucleus—control center B. Ribosome— site is protein synthesis C. Mitochondrion— site of photosynthesis D. Plasma Membrane— regulation of what passes in and out of cell

Biology & Microbiology

For a given set of sample statistics, changing the null hypothesized value (K) for a population mean changes everything except for what?

A. P-value B. Sample standard deviation C. T-stat D. Rejection region

Biology & Microbiology