Transmembrane proteins can span the lipid bilayer as
a. alpha-helices.
b. beta-barrels.
c. Both a and b
d. None of the above
Ans: c. Both a and b
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The transduction of sound waves into electrical signals takes place
A. within the tectorial membrane as it is stimulated by the hair cell. B. within hair cells as they are bent against the tectorial membrane, causing them to depolarize and release neurotransmitter that stimulates sensory neurons. C. as the basilar membrane becomes more permeable to sodium ions and depolarizes, initiating an action potential in a sensory neuron. D. as the basilar membrane vibrates at different frequencies in response to the varying volume of sounds. E. within the middle ear as the vibrations are amplified by the malleus, incus and stapes.
If a pure-breeding wired-hair terrier (WW) is crossed with a pure-breeding smooth-hair terrier (ww), and a puppy with
a wavy hair is produced, the simplest explanation is ____.
a. a mutation has occurred b. hair texture is an X-linked trait c. incomplete dominance d. hair texture is a lethal trait e. codominance
These sharply pointed teeth on the sides of the mouth tear food
A) molars B) premolars C) canines D) incisors
Each of the following statements concerning the gram-positive cell wall is true EXCEPT
A) it maintains the shape of the cell. B) it is sensitive to lysozyme. C) it protects the cell in a hypertonic environment. D) it contains teichoic acids. E) it is sensitive to penicillin.