Short-day plants flower only if
A) they are in the shade.
B) abscisic acid is available.
C) the duration of uninterrupted darkness is longer than some species-specific length.
D) their phytochrome-mediated responses are inhibited.
C
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Enzymes in the body catalyze biochemical reactions and ____
a. are chemically changed at the end of the reaction b. are destroyed at the end of the reaction c. are processed into substrate molecules d. convert substrate molecules into products e. convert products into substrate molecules
To determine the causative agent of a central nervous system (CNS) infection, a sample is taken from the
A. cerebrospinal fluid. B. arterial blood. C. venous blood. D. urine.
Which of the following is not involved in the "taste" of food?
A. temperature B. texture C. color D. chemical composition
The atria of the heart
A. are separated from each other by the interventricular septum. B. function primarily as reservoirs for blood collection. C. function primarily as the pumps of the heart. D. receive blood from the aorta and pulmonary trunk. E. have all of these characteristics