According to the American Cancer Society, 30% of all cancer deaths in the U.S. are due to ____
a. ultraviolet light exposure
b. automobile exhaust
c. industrial pollutants
d. pesticide and herbicide exposure
e. smoking
e
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Hyphae are tubular cell walls that surround the cytoplasmic membrane
Indicate whether the statement is true or false.
________________ is directional growth responses of plants to a unidirectional source of light.
A. Gravitropism B. Thigmotropism C. Dormancy D. Phototropism E. Thermotropism
Peripheral proteins are linked to either surface of the plasma membrane by:
a. covalent disulfide bonds. b. associating with fatty acids through hydrophobic interactions. c. embedding in one side of the membrane and, thus, not extending through to the other side. d. associating with glycoproteins on the inner membrane surface. e. bonding to integral proteins through noncovalent interactions
A small amount of antigen is injected under the skin of a patient. After 30 minutes there is no apparent change at the injection site, but 36 hours later the patient reports that the area is red and swollen. This type of response is due to
A) type I hypersensitivity. B) type II hypersensitivity. C) type III hypersensitivity. D) type IV hypersensitivity. E) immunodeficiency.