A diploid somatic ("body") cell has 2n = 20 chromosomes. At the end of mitosis, each daughter cell would have ________ chromosomes. At the end of meiosis I, each daughter cell would have ________ chromosomes
At the end of meiosis II, each daughter cell would have ________ chromosomes.
A) 20, 20, 20 B) 20, 10, 10 C) 20, 20, 10 D) 10, 10, 10
B
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There was a mass extinction of plants and animals at the end of the Permian period. Which of the following would be a reasonable prediction for the fungal fossil record?
A. There should be a massive increase in saprophytic fossils during the extinction, and then a massive decline shortly after the extinction was complete. B. There should be a slow increase in all fungal fossils during the time that plant and animal species declined, with their numbers staying relatively high afterward since there was little competition from other species. C. There should be a massive decrease in all fungal fossilsat the same time that plant and animal species started to decline, and the number of these fossils should remain low throughout the extinction period D. There should be a massive increase in mycorrhizal fossils during the extinction and afterward.
An immunoassay was developed to rapidly diagnose patients infected with an emerging virus. However, the researchers discovered that some individuals were producing false negatives when tested, despite being infected with the virus. What might explain this?
A. Changes in the antibody produced by the virus B. Rapid evolution of the viral antigen C. Changes in the length of the viral DNA D. Number of genome copies carried in each virion
An advantage of the smaller size of prokaryotes, compared to eukaryotes, is
A. high surface area relative to low cell volume. B. more rapid growth rates. C. compartmentalization of cellular processes in membrane-bound organelles. D. predators, parasites, and competitors constantly surround them. E. high surface area relative to low cell volume AND more rapid growth rates.
In large scale, genome-wide association studies in humans we look for _____
A) lengthy sequences that might be shared by most members of a population B) SNPs where one allele is found more often in persons with a particular disorder than in healthy controls C) SNPs where one allele is found in families with particular introns sequence D) SNPs where one allele is found in two or more adjacent genes