Mutation in an A group gene in Arabidopsis thaliana affects development in its flower's
a. first whorl only.
b. second whorl only.
c. third whorl only.
d. first and second whorls.
e. second and third whorls.
ANSWER: d
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In ruminants, cellulose digestion occurs in the
A. omasum. B. rumen. C. reticulum. D. cecum. E. rumen and reticulum.
_____ is the original source of new alleles
a. Mutation b. Natural selection c. Genetic drift d. Gene flow e. All are original sources of new alleles
Which of these characteristics first developed in reptiles?
A. skull and vertebral column B. animals living completely on land C. scales on skin D. amniotic egg E. four-legged body
Which of the following CANNOT be made by using recombinant DNA technology?
a. Vaccines b. Human hormones c. Pharmaceutical drugs d. Life e. Pest-resistant crops