What is the combined function of the malleus, incus, and stapes?
a. convert the mechanical vibration of the tympanic membrane into a pressure wave in the
cochlear duct
b. amplify the vibrations of the ear drum
c. equalize the pressure on both sides of the tympanic membrane
d. convert the oval window's vibrations into vibrations of the tympanic membrane
e. dampen the vibrations of the tympanic membrane
B
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Of the following codons, which encodes a normal translational stop?
A) UUU B) AUG C) UAG D) AAA E) AGG
Why is widespread resistance to tuberculosis (TB) not likely to evolve any time soon?
A) Only a small percentage of people who are nonresistant to the bacterium will become infected and die from TB, so the variant will stay in the population. B) TB is highly fatal, so those who are nonresistant will die quickly. C) Humans are no longer evolving, so the population cannot develop widespread resistance. D) It would be too expensive to genetically engineer people to give them the resistance gene.
Which of the following structures can perform all the activities required for life?
A) DNA molecules B) cells C) organelles D) nuclei
The human cardiovascular system is comparable in some ways to a car's:
A) electrical system. B) cooling system. C) engine. D) transmission system.