In rodents, horses, and lagomorphs, the digestion of cellulose takes place in the
A. cecum.
B. anus.
C. mouth.
D. stomach.
E. large intestine.
Answer: A
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If DNA repair mechanisms were perfect, which of the following would most likely result?
A. We would live forever. B. Evolution as we know it would stop because mutations are the only agent that gives us new genetic variation. C. The rate of evolutionary change would dramatically increase. D. Humans would stop aging, as aging is a collection of DNA mutations. E. All of the answer options are correct.
Oxidation of proteins is achieved most readily
A. by moist heat. B. by moist heat under pressure. C. in a hot air oven. D. in the presence of organics.
You are asked to give a classroom demonstration of DNA supercoiling. To do so, you take two different colored pieces of rubber tubing, twist them very tightly and excessively around each other and join the ends of the tubing appropriately. Next, you relieve the supercoiling by breaking one strand and unwinding it. In this demonstration, the breaking and unwinding to relieve the supercoiling simulates the action of
A. ligases. B. primases. C. topoisomerases. D. polymerases. E. exonucleases.
Which of the following will happen after a person takes an antibiotic orally?
a. The growth of normal flora will be inhibited. b. The growth of pathogens will be inhibited. c. Opportunistic microorganisms such as antibiotic-resistant Staphylococcus will become established. d. all of the above