Exchange of respiratory gases through the skin is a
characteristic of many
a. fishes.
b. amphibians.
c. reptiles.
d. mammals.
e. birds.
Answer: b
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Use the principle of parsimony and molecular genetic data to choose a phylogenetic tree for your hypothesis of how the extant species were derived from the ancestor.
A. Tree 1 requires the most mutations, making it the best choice.
B. Tree 1 requires the fewest mutations, making it the best choice.
C. Tree 2 requires the most mutations, making it the best choice.
D. Tree 2 requires the fewest mutations, making it the best choice.
E. Both trees are equally good because sequences A, B, C, and D are the same in both.
A mild traumatic brain injury can ____
a. lead to a greater focus in concentration b. be metabolically beneficial c. lead to a depression in neuron excitability d. cause a contraction of brain tissue e. cause impaired short term memory
Herpes and other enveloped viruses enter their
host cells a. through pores. b. by dissolving the host plasma membrane. c. by fusion of the viral membrane with the cell’s plasma membrane. d. by activating transport proteins in the host cell's plasma membrane. e. any of these
Which of the following is a key concern related to exponential population growth?
a. Degradation of the natural environment b. Shift of age structures in developing nations c. Limitations in funding family planning programs d. Implementation of international one-child policies