_____ groups impart polarity to alcohols
a. hydroxyl (-OH-) c. methyl (-CH3)
b. phosphate (-PO4-) d. sulfhydryl (-SH)
A
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Water diffuses through certain organs such as the kidneys and bladder much faster than would occur by passive diffusion through a lipid bilayer alone. What accounts for this more rapid rate of water transport in these organs?
A. The composition of lipids changes to promote water transport. B. Presence of aquaporin channels for facilitated diffusion of water. C. Presence of a water pump. D. Presence of an ATP-driven enzyme for water transport. E. The presence of molecules that bind water and change its membrane permeability properties.
The genetic condition xeroderma pigmentosum, which can lead to skin cancer, results from the inability to
A) correct UV-induced thymine dimers. B) process the amino acid phenylalanine. C) produce functional hemoglobin. D) correct transitions. E) correct breaks in the X chromosome.
The Pacinian corpuscle is used in detecting
a. sound. b. pressure. c. chemicals. d. sight. e. chemical differences.
The oxygen in the atmosphere developed approximately ________ billion years ago.
A. 4.5 B. 2.0 C. 3.5 D. 1.5