According to the multiregional model,
a. Homo erectus populations migrated out of
Africa.
b. Homo erectus evolved further in regions beyond
Africa.
c. Homo erectus populations gave rise to races of
Homo sapiens.
d. Homo sapiens subpopulations originated in
several separate locations.
e. all of these are true.
Answer: e
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A peptide bond is found between the amino group of one amino acid and the ____________________ group of a
second amino acid. Fill in the blank(s) with the appropriate word(s).
Which fish has a sharp spearlike point at the tip of their tail that defends them against predators and sometimes secretes venom?
a. lamprey b. hagfish c. sharks d. stingrays e. lungfish
You are studying two populations of a certain species of frog in two ponds five kilometers apart. There are no other ponds in the area. In pond A all the frogs are small and have a few black spots on them. In pond B most of the frogs are large and lack spots but a few are small without spots and a few are large with spots. Because of the differences in these two populations
A. the distance between ponds is probably a barrier. B. there is probably little interbreeding between the two populations. C. the population in pond A could have gone through a genetic bottleneck. D. All of the choices could be correct.
Molecules that contain an asymmetric carbon are said to be:
A. chiral. B. optically inactive. C. achiral. D. enantiomeric. E. hydrophobic.