There is a single gene that controls the ability to taste PTC paper. The ability to taste is dominant to the inability to taste. If you can taste the paper, it is very bitter. Which of the following genotypes can taste the paper?
A. only Pp
B. both PP and Pp
C. only pp
D. both PP and pp
E. only PP
Answer: B
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Four of the five characteristics listed below are those
of an unchanging, nonevolving population. Select the exception. a. random mating b. no mutation c. differential survival d. no migration or gene flow e. infinitely large population
Which one of the following steps in the breakdown of glucose can occur without oxygen?
A) glycolysis B) the preparatory step C) the citric acid cycle D) the electron transport system E) both the citric acid cycle and the electron transport system
The accumulation of carbon dioxide, lactic acid, or other cellular waste causes nearby precapillary sphincters to
A) shorten. B) contract. C) lengthen. D) relax.
Answer the following questions true (T) or false (F)
1. Sperm development requires temperatures somewhat cooler than found in the rest of the body. 2. Sperm develop in the seminal vesicles. 3. The male stem cells in sperm production are the spermatogonia.