The hormone insulin enhances the transport of glucose into body cells. Its secretion is controlled by a negative feedback system between the concentration of glucose in the blood and the cells that secrete insulin
Which of the following statements is most likely to be correct?
A. A decrease in blood glucose concentration will stimulate insulin secretion, which will in turn lower the blood glucose concentration still further
B. An increase in blood glucose concentration will stimulate insulin secretion, which will in turn lower the blood glucose concentration
C. A decrease in blood glucose concentration will stimulate insulin secretion, which will in turn increase the blood glucose concentration
D. An increase in blood glucose concentration will stimulate insulin secretion, which will in turn increase the blood glucose concentration still further
B
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When two monosaccharides undergo a dehydration synthesis,
A) two new monosaccharides are formed. B) a disaccharide is formed. C) a polysaccharide is formed. D) a starch is formed. E) hydrolysis occurs.
What is the action of the muscle labeled I?
a) extends the forearm at the elbow joint b) flexes the forearm at the elbow joint c) pronates the forearm at the radioulnar joints d) abduct arm at shoulder joint e) rotates arm at shoulder joint
The embryo is directly enclosed in and protected by the amnion
Indicate whether the statement is true or false
Water is a polar molecule, yet it easily moves through the nonpolar portions of cell membranes. Which transport process is responsible?
A) symport B) uniport C) simple diffusion D) antiport E) facilitated diffusion