Why are scientists interested in the related forms of HIV found in other animals?
A. Scientists are more interested in non-human animals than humans.
B. Humans are resistant to non-human forms of HIV.
C. Non-human forms of HIV are more dangerous.
D. Other animals are able to live a normal life with the virus.
Ans: D. Other animals are able to live a normal life with the virus.
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Which of the following can result in speciation
within a few generations? a. development of a physical barrier b polyploidy c. postzygotic isolating mechanisms d. change in environmental conditions e. the introduction of a new predator into an area
How is it that the cells in different body tissues are able to perform different functions?
A) The cells exhibit different patterns of gene expression. B) Different chromosomes have been inactivated in different cells. C) The cells contain different genes. D) The mutations that have accumulated in the cells of the different tissues control functions.
Which of the following statements about DNA viruses that affect humans is FALSE?
a. They use the host's enzymes to replicate. b. They replicate in the nucleus. c. They are single-stranded. d. They use the host cell's internal machinery to replicate.
The domesticated dog has 78 chromosomes in its somatic cells. How many autosomes do dogs have?
a) 78 b) 76 c) 39 d) 38