Suppose that an adult black bear adds 50 pounds of fat in order to survive while hibernating through the winter. Approximately how much glycogen would a bear have to add to achieve a similar feat?
A) 25 pounds
B) 50 pounds
C) 75 pounds
D) 100 pounds
Answer: D
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During meiosis in an organism where 2n = 8, how many chromatids will be present in a cell at the beginning of meiosis II?
a. 2 b. 4 c. 6 d. 8 e. 12
A short segment of an mRNA molecule is shown below. The polypeptide it codes for is also shown:
5'-AUGGUGCUGAAG : methionine-valine-leucine-lysine Assume that a mutation in the DNA occurs so that the fourth base (counting from the 5' end) of the messenger RNA now reads A rather than G. What sequence of amino acids will the mRNA now code for? (You do not need a copy of the genetic code to answer the question.) A) methionine-valine-methionine-lysine B) methionine-lysine-leucine-lysine C) methionine-leucine-leucine-lysine D) methionine-methionine-leucine-lysine E) methionine-valine-leucine-lysine
Most commercial pesticides are effective for only 2 or 3 years because
A) the chemicals induce mutations that provide immunity. B) new pests invade the area. C) the chemicals mutate and become ineffective. D) the pests learn to hide when the chemicals are being applied. E) those pests born with mutations that provide immunity will survive and reproduce.
The figure below shows three mouse populations and their associated changes in the frequency of B, the allele for dark fur. The recessive b allele codes for white fur. After 20 generations, in which population would you be most likely to encounter a white mouse? 
A. N2 B. N3 C. There is an equal probability of encountering a white mouse in all three populations. D. There is an equal probability of encountering a white mouse in populations N1 and N3 and this is higher than in N2. E. N1