When a doctor uses a stethoscope to listen to your heart and hears the lub-dub sound, she is actually listening to the:
A) blood surging through the arteries.
B) electrical signals that control heartbeat.
C) valves in the heart closing.
D) contraction of the cardiac muscle in the ventricles.
Answer: C
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Can energy be harvested by the cells from glucose without oxygen?
A. Yes, about as much as with oxygen. B. No, oxygen is required to harvest any energy from glucose. C. Yes, but not quite as much as with oxygen. D. Yes, but much less than with oxygen.
In which of the following would it be possible to find the most dilute urine?
1.proximal tubule 2.loop of Henle 3.distal tubule 4.collecting duct
All of the following are taproots that are consumed as vegetables EXCEPT
A. radishes. B. celery. C. beets. D. carrots. E. turnips.
Which type of macromolecule is a polysaccharide?
a. protein b. lipid c. carbohydrate d. hexose