Some adults have the ability to digest lactose in milk. This is an example of
A. adaptation.
B. feedforward regulation.
C. positive feedback.
D. negative feedback.
E. None of the choices are correct.
Answer: A
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Given that impulses from parasympathetic nerves decrease heart rate, and that the neurotransmitter for parasympathetic postganglionic fibers is acetylcholine (ACh), predict how the following chemicals might affect heart rate
A) Pilocarpine, a drug that simulates the action of ACh, will increase heart rate; and atropine, a drug that blocks the action of ACh, will decrease heart rate. B) Pilocarpine, a drug that simulates the action of ACh, will decrease heart rate. C) Atropine, a drug that blocks the action of ACh, will decrease heart rate. D) Pilocarpine, a drug that simulates the action of ACh, will increase heart rate.
Which of the following structures reabsorbs glucose and amino acids from the glomerular filtrate?
A. Collecting duct B. Proximal convoluted tubule C. Glomerular capillaries D. Distal convoluted tubule E. Renal corpuscle
The leading strand of DNA is formed as
A. a template. B. a continuous strand, adding to the 3´ end. C. short segments called Okazaki fragments. D. a continuous strand, adding to the 5´ end. E. soon as the lagging strand is formed.
What are the arteries which diverge from the interlobar arteries near the base of the renal pyramid?
A. Segmental B. Renal C. Interlobular D. Arcuate E. Peritubular