Which statement about fiber is false?
A) The cellulose of celery stalks and lettuce leaves is fiber.
B) Fiber passing through the digestive system scrapes the wall of the digestive tract, stimulating mucous secretion, and aiding in the digestion of other molecules.
C) Fiber in the diet slows the passage of food through the intestines.
D) Humans are unable to extract any caloric value from fiber.
E) Dietary fiber reduces the risk of colon cancer.
C) Fiber in the diet slows the passage of food through the intestines.
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Asexual reproduction in fungi can be accomplished by
A. budding of somatic vegetative cells. B. binary fission. C. hyphal fragmentation. D. All of the choices are correct.
In humans, the blastocyst develops about ___
days after fertilization.
a. 1 b. 3 c. 5 d. 7 e. 9
An acid is a substance that, in solution, releases
A. oxygen ions in H2SO4. B. hydrogen ions, for example, HCl. C. —COOR ions from beer. D. chloride ions from NaCl.
In birds, after fertilization but prior to the emergence of the chicks, the development of the fertilized egg is:
a. dimorphic. b. internal. c. ignored by both parents. d. external. e. variable.