The by-product of the metabolism of cyanobacteria
that had the most effect on the further evolution of
life is
a. oxygen gas.
b. carbon dioxide.
c. water.
d. nitrogen gas.
e. hydrogen gas.
Answer: a
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Which cellular structure is unique to animal cells?
A. Ribosomes B. Mitochondria C. Nucleus D. Lysosome
The product of the lacI gene is _____
A) an enzyme B) a transport protein embedded within the membrane C) ?-galactosidase D) the repressor
Most cases of red-green colorblindness are inherited as an X-linked recessive characteristic. Which of the following are possible if a woman, who is a carrier for colorblindness, has offspring with a male who is colorblind?
a. All their sons will have normal color vision. b. All their sons will be colorblind c. All their daughters will be colorblind. d. All their daughters will have normal vision. e. All of the above are possible.
The hepatic portal system is a special blood circuit between the ____ and ____
a. liver; spleen b. kidney; liver c. liver; intestine d. kidney; heart e. spleen; heart