Leukocytes (white blood cells) account for about _______ of the cells in human blood.
A. 60%
B. 10%
C. 0.1%
D. 1%
D. 1%
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It is believed that HIV has passed from chimps to humans more than once. This suggests that animal-to-human viral transmissions may be more common than previously thought
What is the best evidence in support of the conclusion that HIV made the chimp-to-human leap more than once? A) HIV has multiple strains, and the virus does not appear to be able to leap from humans back to chimps. B) HIV has appeared on multiple continents. C) Human-to-human transmission of HIV requires direct personal contact that simply could not have resulted in the widespread outbreak we see today. D) Several species are known to have similar viruses resulting in immunodeficiency diseases.
Which blood vessel structure is only found in veins?
a. elastic layer b. basement membrane c. smooth muscle d. valve e. endothelium
Assume that a species has a diploid chromosome number of 24. The term applied to an individual with 25 chromosomes would be triploid
Indicate whether the statement is true or false
In a female human cell, what would be the effect on X inactivation if a mutation occurred in the Xist gene making it nonfunctional?
A. Both of the X chromosomes would become inactivated. B. Only the paternal X chromosome would become inactivated. C. Only the maternal X chromosome would become inactivated. D. Neither of the X chromosomes would become inactivated. E. One of the two X chromosomes would become inactivated.