Which virus infects virtually all children by age 2?
a) coronavirus
b) respiratory syncytial virus
c) rhinovirus
d) Influenza virus
Ans: b) respiratory syncytial virus
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What would be the hypothetical outcome if the action of RecA were inhibited during the SOS response?
A. LexA would autolyse, and therefore the transcription of DNA repair genes would occur. B. LexA would not autolyse, and therefore the transcription of repair genes would occur. C. LexA would not autolyse, and therefore the transcription of DNA repair genes would not occur. D. LexA would autolyse, and therefore the transcription of repair genes would not occur.
Which of the following is a correct interpretation of the wings of bats and the wings of birds?
a. they are homologous because the common ancestor of bats and birds had wings b. they are not homologous because their similar internal bone structure evolved independently as an adaptation for flight c. they are homologous because they are adapted for the same function d. they are homologous because they have similar internal bone structure inherited from a common ancestor e. they are not homologous because wings evolved from different ancestral organs in birds and bats
The thick wall that separates the heart into a left and right half is the
a. septum. b. myocardium. c. pericardium. d. endocardium. e. chordae tendinae.
What allows membranes to be permeable to small ions?
a) ion channels b) G-proteins c) small ions can pass directly through a lipid bilayer d) aquaporins