Simulation experiments like those first performed by
Stanley Miller in 1953 demonstrate that
a. DNA forms readily and reproduces itself under
abiotic conditions.
b. many of the organic compounds required for life
can form under abiotic conditions.
c. prokaryotic cells form under simulated primitive
atmosphere conditions.
d. membranes eventually form under simulated
primitive atmosphere conditions.
e. none of these are true.
Answer: b
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Zhang and Cech’s experiments confirmed which feature of ribozyme activity?
a. Ribozymes inhibit rates of biological reactions. b. Ribozymes catalyze formation of bonds between amino acids in protein synthesis. c. Ribozymes catalyze formation of the fundamental linkage tying nucleic acids to proteins. d. Ribozymes can link nucleic acids together even if their proteins are removed. e. Ribozymes provide a possible solution to the question of whether proteins or nucleic acids appeared first in evolution.
The Arctic tern makes an annual migration of up to ____
a. 700,000 km b. 70,000 km c. 7,000 km d. 700 km e. 70 km
The reproductive system is the only system that contributes to homeostasis
1.True 2.False
Somatostatin is secreted by
a. pancreatic islet cells. b. the thyroid gland. c. the pituitary gland. d. the adrenal medulla. e. the adrenal cortex