The DTP vaccine protects against _________.
A. tuberculosis
B. diptheria
C. polio
D. two of the above
E. all of the above
Answer: B. diptheria
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Which of the following amino acids is/are negatively charged at physiological pH?
A. serine B. aspartate C. glutamate D. serine, aspartate, and glutamate E. aspartate and glutamate
DNA contains all of the following nitrogen-containing bases EXCEPT ____
a. adenine b. uracil c. guanine d. adenine e. thymine
In eusocial animals like ants, the queen is diploid and the male is haploid. Why would female worker ants be more likely than other animals to engage in altruism, feeding the queen's offspring?
A. The queen establishes a dominance hierarchy over the colony. B. The worker ants are monogamous and remain faithful to the queen ant. C. It is a reflex for the worker ants to be altruistic. D. The worker ants are more related to the queen's offspring than they would be to their own offspring. E. The worker ants hope for reciprocal altruism and may become the queen ant.
To determine the age of a woody twig, one counts the
a. nodes. b. leaf scars. c. lenticels. d. regions between sets of terminal bud scale scars.