A benign tumor is a condition in which tumor cells __________.
A. remain confined to their original site
B. have an unusual number of chromosomes
C. migrate from the initial site of transformation to other organs or tissues
D. invade the circulatory system
A. remain confined to their original site
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Competitive exclusion is based on the idea that:
a. one species will voluntarily allow the other to survive b. no two species can completely occupy the same niche c. the larger species will always dominate the smaller d. competition is overrated as a factor in species survival e. two species can live together if they share the same niche but use it at different times
Red-green color blindness is an X-linked recessive
trait in humans. What is the probability that a colorblind woman and a man with normal vision will have a color-blind daughter? a. 100% b. 75% c. 50% d. 25% e. 0%
The mouse is a particularly useful model for studying human disease because _____
a. mice and humans are 100% genetically identical b. all mice are in essence, clones c. mice do not feel pain and discomfort d. mice and humans are the only species whose genomes have been sequenced e. approximately 90% of human disease-associated genes are present in the mouse genome
Organisms that grow near deep-sea volcanic vents are likely to be ________.
A. psychrotrophic B. psychrophilic C. thermophilic D. mesophilic