Which type of cell produces proteins that form the tough, water-insoluble layer in the skin?
a. melanocytes
b. Granstein cells
c. keratinocytes
d. Langerhans cells
e. pigmented cells
Answer: c. keratinocytes
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Most biologists now agree that the common ancestor of all animals was probably a eumetazoan
a. True b. False
Triggers for germination of seeds include all of the following except ________
a. water penetrating a seed coat b. desiccation c. smoke or burning d. light or darkness
In the experiment with Peacock butterflies, the
working hypothesis is that a. mimicry confuses both predator and prey. b. mimicry conveys a selective advantage to the prey. c. birds are capable of learning. d. birds are agents of evolution. e. unpalatable species display distinctive wings.
Which of the following base pairs is mismatched:
A. adenine; thymine B. guanine; uracil C. cytosine; guanine D. adenine; uracil