In the digestive system, peristalsis is _____
A) a process of fat emulsification in the small intestine
B) voluntary control of the rectal sphincters regulating defecation
C) the transport of nutrients to the liver through the hepatic portal vessel
D) smooth muscle contractions that move food along the esophagus
D
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Choose the best explanation as to why both consumers and producers perform cellular respiration.
A. Both consumers and producers perform cellular respiration to produce the oxygen necessary to sustain life. B. Both consumers and producers perform cellular respiration to produce the heat necessary to sustain life. C. Although they may obtain their sugars in different ways, both consumers and producers rely on cellular respiration to make ATP. D. Both consumers and producers perform cellular respiration to produce the sugars needed to fuel the energy of life.
Flowering is triggered by the production of _________, which triggers the transition of apical meristem to floral meristem
A. meristemogen B. florigen C. auxin D. gibberellin E. ethylene
The number of organisms necessary to insure infection is termed the
A. infectious dose. B. fatal number. C. minimum lethal dose. D. pathogenic number.
Antibodies are most similar in structure to
A) T-cell receptors. B) bacteria. C) viruses. D) B-cell receptors. E) macrophages.