The source of new alleles within a population is ____
a. natural selection
b. mutation
c. nonrandom mating
d. adaptation
e. genetic drift
ANSWER: b
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HIV once only infected nonhuman primates and now infects humans as well. Likewise, the avian flu only infected birds but now infects humans. What causes the host range of a virus to increase?
A. The size of the virus changes over time and allows the virus to infect a different host cell. B. The virus integrates with another virus to gain the DNA sequences that allow infection of a new host cell. C. The virus gains entry into a new host cell through random mutation of the virus's genetic material. D. Changes in the human genome over time make humans more susceptible to infection by different kinds of viruses. E. None of the answer options is correct.
Map distances above 50 are considered unreliable due to the occurrence of double-crossovers between the genes
Indicate whether the statement is true or false
The major function of the large intestine is to
A) neutralize chyme. B) reabsorb water. C) make bile. D) digest food. E) produce digestive enzymes.
Interneurons have:
a. many dendrites and one axon b. many axons and one dendrite c. one axon and one dendrite d. axons only e. no cellular projections