When blood calcium levels fall, ____
a. PTH secretion increases
b. osteoblast activity increases
c. osteoclast activity decreases
d. growth hormone activity increases
e. calcitonin secretion increases
ANSWER: a
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These antibodies stay attached to the B cell's plasma membrane and serve as receptors for binding with antigen or complement
a. IgA b. IgG c. IgM d. IgE e. Both IgE and IgA
The silverfish
a. have incomplete development. b. undergo direct development. c. parasitize other insects. d. produce large quantities of ammonia waste. e. fit none of these descriptions.
Which of the following statements is false
concerning the outermost layer of the epidermis? a. It is the first to be subjected to any abrasion. b. Keratin provides waterproofing. c. Millions of cells are worn off daily. d. Its upper cells undergo rapid cell division. e. Its outermost cells are dead.
All of the following types of chemical bonds are responsible for maintaining the tertiary structure of
this polypeptide except:a.
ionic bonds.
b. hydrogen bonds.
c. hydrophobic interactions.
d. disulfide bonds.
e. peptide bonds.