When young male white-crowned sparrows first begin to sing, they match their vocal output to ____
a. any birdsong they hear during their initial days of singing
b. an instinctive blueprint of their species' song
c. the memory of their species' song heard months earlier
d. the memory of whatever song they heard during an early critical period
e. the songs of male relatives heard during their initial days of singing
ANSWER: c
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In DNA replication there are leading and lagging strands, because
A) DNA replication is conservative and a completely new DNA molecule must be made. B) DNA replication is semiconservative and each strand is copied simultaneously in opposite directions. C) the strands of DNA are parallel and are copied in the same direction simultaneously. D) one strand of DNA is copied faster than the other.
The embryonic nervous systems of peanut worms (Sipuncula) and spoon worms (Echiura) show that these worms ________
A) are descended from segmented ancestors B) have appendages that are homologous with arthropod appendages C) do not express Hox genes during development D) are similar to each other because of homoplasy E) are surprisingly closely related to vertebrates
The exchange of oxygen and carbon dioxide between the blood and the lungs is called ________
A) inspiration B) external respiration C) exhalation D) internal respiration
Carbon dioxide fixation
What will be an ideal response?