Which is the best definition of the term ligand?
A. a receptor composed of protein
B. a molecule or ion that binds to a protein
C. any molecule found in the intracellular fluid
D. any molecule found in the extracellular fluid
E. a carbohydrate molecule that binds weakly to membrane phospholipids
B
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Simple goiter is most prevalent where the soil lacks
A. vitamins. B. potassium. C. iodine. D. organic matter.
Erection of the penis is caused by
A) erectile tissues that become engorged with blood. B) the penis filling with the semen to be ejaculated. C) contraction of the longitudinal muscles. D) protrusion of the os penis, the penis bone. E) None of the answers are correct.
Plasma accounts for about 55% of blood
a. True b. False Indicate whether the statement is true or false
The gastric enzyme ________ is secreted in inactive form and activated by the low pH of gastric juice.
A. rennin B. trypsin C. intrinsic factor D. pepsin