The genetic code is translated in groups of ________ bases.
A. four
B. three
C. two
D. five
Answer: B
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Which amino acid(s) is/are found only in the cell walls of bacteria?
A. Glycerol B. L-form of glycine C. Diaminopimelic acid D. L-form of methionine E. L-form of glycine AND L-form of methionine
Which hormone is responsible for increasing blood calcium levels?
a. insulin b. glucagon c. parathyroid hormone d. calcitonin
The effect of resource availability on population size ultimately determines ____.
A. the carrying capacity of the environment B. exponential growth C. the doubling time of a population D. the population’s biotic potential E. the loss of species in an ecosystem
Which of the following is not involved in natural selection?
A. there is always competition for resources B. organisms differ in reproductive success C. There are inheritable variations in populations. D. The desired traits are chosen by a breeder