An example of a fluid feeder is a ____
a. hummingbird
b. lamprey
c. gray whale
d. snake
e. heron
ANSWER: a
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ORF refers to
A. the region of a gene that serves as the promoter. B. the location of the start site of transcription. C. the region of a gene that codes for a protein or a functional RNA product. D. the region between the ribosome binding site and translation initiation codon.
A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with ________.
A. carbon dioxide B. high salt C. temperatures above 37° C D. oxygen E. high acidity
The effectiveness of geographic barriers in
promoting speciation is related most to a. the size of the barrier. b. the inability of the organisms to overcome the barrier. c. the speed at which the barrier forms. d. how long the barrier exists. e. the size of the population it separates.
Which structure(s) would be subject to the lowest blood pressure?
Select one: a. vena cava b. aorta c. atrioventricular valve d. pulmonary arteries e. semilunar valve