During male sexual arousal ____
a. penile blood vessels are constricted
b. blood flow out of the penis increases
c. testosterone levels fall
d. sensory nerve endings of the penis are inactivated
e. blood flow to the penis is increased
ANSWER: e
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Today it is generally believed that animals cannot live below the lit regions of the ocean
Indicate whether the statement is true or false
The “tunic” of tunicate refers to
a. a body covering. b. the type of food-gathering mechanism. c. muscle arrangements in the larva. d. the immature stage of a true fish. e. organ rotation during reorganization.
Of the following, which would be predicted to grow the most slowly?
a. bread molds b. lichens c. yeasts d. mushrooms e. sac fungi
A scientist makes three artificial mRNA strands: (x) 5' AAAUUUAAAUUUAAAUUUAAAUUUAAA 3'(y) 5' UUUCCCUUUCCCUUUCCCUUUCCCUUU 3'(z) 5' AUAUAUAUAUAUAUAUAUAUAUAUAU 3'When he analyzes the polypeptides produced, he finds that:x produces a polypeptide that is 50% phenylalanine and 50%lysine.y produces a polypeptide that is 50% phenylalanine and 50% proline.z produces a polypeptide that is 50% isoleucine and 50% tyrosine.Based on these results only, the best conclusion to make is that
A. AAA codes for phenylalanine and AUA codes for isoleucine B. AUA codes for isoleucine C. AAA codes for phenylalanine D. AAA codes for lysine and AUA codes for isoleucine E. AAA codes for lysine