Thomas Malthus proposed that
a. the food supply increased faster than the
population.
b. the population increased faster than the
food supply.
c. the food supply and population increased at
the same rate.
d. artificial selection was the key to evolution.
e. natural selection was the key to evolution
B
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Some migratory birds that fly during the day position themselves using the location of the Sun in conjunction with an
internal biological clock. This wayfinding mechanism is called ____.
a. solar migration b. landmark migration c. piloting d. navigation e. compass orientation
__________ are electrically excitable cells that signal other cells by means of chemical messages. Fill in the blank(s) with the appropriate word(s)
Which of the following is true of an asymmetric carbon atom?
A) Only amino acids have asymmetric carbon atoms. B) A carbon with hydrogens attached at two locations is usually asymmetric. C) A carbon with hydrogens attached at three locations is usually asymmetric. D) Asymmetric carbon atoms create stereoisomers. E) Molecules may have only one asymmetric carbon atom.
How many NADH are produced in the Krebs cycle for each glucose molecule used?
A) eight B) six C) three D) one