The two strands of a DNA double helix are held to each other by ____ bonds between nitrogenous bases
a. phosphodiester
b. disulfide
c. glycosidic
d. hydrogen
e. peptide
ANSWER: d
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Which of the rRNA molecules has proven the most useful in taxonomy/identification?
A. 5S B. 16S C. 23S D. 80S
Recent research suggests that a homing pigeon can navigate to its home coop from any direction by using ____ as
their compass and ____ as their map.
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Where are choanocytes found?
a. in humans b. in birds c. in earthworms d. in sponges