How does heat affect a DNA duplex? It causes:
a. the two strands to anneal.
b. double-stranded breaks.
c. denaturation.
d. hybridization.
e. mutations.
Ans: c
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In organisms with large genomes, inversions typically occur in
A. coding DNA. B. noncoding DNA. C. open reading frames. D. closed reading frames. E. reciprocal translocations.
If an Arabidopsis plant does not express homeotic genes during flower development
A. the plant will die. B. the plant will only develop to the heart stage. C. the plant will not develop cotyledons. D. the plant will develop leaves instead of flowers. E. the plant will develop flowers instead of leaves.
When sodium ions flow into the axon cytoplasm, ____
a. the membrane potential reverses b. the cytoplasm becomes more negatively charged c. the interstitial fluid becomes more positively charged d. an action potential is reversed e. the membrane potential is re-established
The electron micrograph in the figure shows chromatin organized like beads on a string. Which histone protein is usually associated with the "string" portion?
a. histone H1 b. histone H2A c. histone H3 d. histone H4