HIV is a virus that is particularly difficult to eradicate
A) because of the size of its DNA genome.
B) because it rarely mutates.
C) because after it mutates it can be resistant to drugs.
D) due to its small size.
Answer: C
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Which of the following statements concerning
production of bryophyte reproductive cells is true? a. Spores and gametes are produced by meiosis. b. Spores and gametes are produced by mitosis. c. Spores are produced by meiosis, whereas gametes are produced by mitosis. d. Spores are produced by mitosis, whereas gametes are produced by meiosis. e. Spores and gametes are both used for sexual reproduction.
The type of viral infection in which a virus enters a host cell, immediately replicates, and causes the host cell to burst is
A. a rare form of viral infection. B. a transgenic infection. C. a lysogenic infection. D. a lytic infection. E. a systematic infection.
Scientists have documented that spring seasons starting earlier due to climate change have resulted in some caterpillar species beginning their maturation stage earlier than normal
There are bird species that need the caterpillars to feed their chicks. However, since the caterpillars are maturing before the chicks hatch (and therefore cannot be used for chick food), the birds are experiencing a drop in their lifetime reproductive success. Interestingly, scientists have also documented that the individual birds that are best able to change when they lay their eggs to align with earlier spring seasons have the greatest lifetime reproductive success. These phenomena are examples of ________. A) an evolutionary response to climate change B) an increase in global greenhouse gas emissions due to climate change C) a change in species distribution due to climate change D) the effects of terrestrial biome distribution due to climate change
The rediscovery in 1900 of Mendel's now famous experiments of the 1850–60s:
a. solved the argument about whether natural selection acted in a slow way on small genetic changes or in a sudden, saltational manner. b. added fuel to the argument about whether natural selection acted in a slow way on small genet-ic changes or in a sudden, saltational manner. c. None of the above. d. All of the above.