Which enzyme in the glycolysis pathway acts as a switch that can be regulated by ATP, ADP, and
NADH?
a. pyruvate kinase
b. triosephosphate isomerase
c. aldolase
d. ATP synthase
e. phosphofructokinase
E
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Retinoic acid ____
a. causes germ cells in male embryos to enter meiosis b. causes germ cells in female embryos to enter meiosis c. prevents germ cells in male embryos from entering meiosis d. prevents germ cells in female embryos from entering meiosis e. affects entry into mitosis but not meiosis
Which of the following white blood cells kills infected or cancerous body cells?
a. eosinophils b. B lymphocytes c. natural killer (NK) cells d. mast cells
The portion(s) of an action potential where the
sodium gates are open is (are) indicated by a. A. b. B. c. C. d. D. e. A and B.
Taking a laxative might have an impact on the survival and reproduction of which of the following
organisms? A. planarians B. cestodes C. trematodes D. nemerteans E. intestinal flukes