The ultimate source of energy for living things is:
a. the Krebs cycle
b. fossil fuels
c. the sun
d. oxygen
e. aerobic respiration
c
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What structures of the male and female reproductive systems share a common embryonic origin?
A. cervix and ejaculatory duct B. labia minora and penis C. clitoris and scrotum D. clitoris and penis
If Raf is mutated so that it is "on" constitutively, what is the effect on the cell?
a) the cells lose growth control b the cells dedifferentiate c) the cells increase in volume permanently d) the cells differentiate e) the cells stop dividing
How could the number of coexisting species within a community be increased?
A) increased total niche space (variety of resources) B) increased niche overlap C) increased specialization D) A, B, C, or any combination of these
What is a characteristic shared by the protozoa which are intestinal parasites of humans?
A. They have a dormant cyst stage. B. They have multiple nuclei. C. They reproduce sexually in an invertebrate host. D. They reproduce sexually in humans. E. They have suckers for adhering to the intestine.