The major site of gas exchange in the lungs is the ____
a. bronchi
b. bronchioles
c. larynx
d. alveoli
e. respiratory bronchioles
ANSWER: d
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There are sixty-one mRNA codons that specify an amino acid, but only forty-five tRNAs. This is best explained by the fact that _____
A) some tRNAs have anticodons that recognize four or more different codons B) the rules for base pairing between the third base of a codon and tRNA are flexible C) many codons are never used, so the tRNAs that recognize them are dispensable D) the DNA codes for all sixty-one tRNAs, but some are then destroyed E) competitive exclusion forces some tRNAs to be destroyed by nucleases
In order for a cell to become cancerous, oncogenes must be , or tumor suppressors are .
A. inactivated; inactivated B. activated; inactivated C. activated; activated D. inactivated; activated E. suppressed; inactivated
What characterizes terrestrial tetrapods?
A) Lives on land, has four limbs B) Lives on land, has four sets of chromosomes C) Lives on land, has four cranial nerves D) Lives in the water, has four limbs
__________, the volume of air that moves in and out of the lungs during one respiratory cycle, is normally far less than __________.
Fill in the blank(s) with the appropriate word(s).