Which of the following is correct regarding the blind spot?
A. It's an area of the retina where rods and cones are concentrated.
B. It's caused by a nontransparent area on the cornea.
C. It's an area of the retina where there are no rods or cones.
D. It's caused by a nontransparent area on the lens.
Ans: C. It's an area of the retina where there are no rods or cones.
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Why is it hypothesized that sexual selection is responsible for most of the variation seen in the human population?
A. because much of the variation is in visible characters B. because humans are unique when it comes to sexual selection C. because mutations are so rare in humans D. because mutations typically take place after reproduction has occurred
The human genome
A. has no foreign DNA because it is excised by DNase. B. has a very small amount of foreign DNA, mostly in the end caps (telomeres) of chromosomes. C. has a lot of foreign DNA, mostly in the end caps (telomeres) of chromosomes. D. has a lot of foreign DNA scattered throughout the genome, including transposons.
The major vector of Rocky Mountain spotted fever in the western United States is
A. Rickettsia rickettsi. B. Rickettsia prowazeki. C. Borrelia burgdorferi. D. Dermacentor andersoni
In _____, a hypha has few or no cross-walls
a. zygomcyetes c. club fungi b. sac fungi d. all of these