61.Proteins, because they attract hydrogen ions, can act as which of the following?

a.acids

b.buffers

c.enzymes

d.antibodies

62.The conditions known as acidosis and alkalosis refer to a disruption of which of the body’s regulatory processes?

a.pH balance

b.protein balance

c.nitrogen balance

d.endogenous metabolism

63.What function does a buffer perform?

a.helps emulsify fats

b.helps maintain a constant pH

c.facilitates chemical reactions

d.helps protect against plaque buildup

64.Which of the following processes is regulated primarily by the buffering action of proteins?

a.pH balance

b.fluid balance

c.blood clotting

d.synthesis of visual pigments

65.Which of the following functions as a transport protein?

a.collagen

b.antibodies

c.thyroxin

d.lipoproteins

66.How do sodium and potassium travel into and out of cells?

a.Antidiuretic hormone transports potassium and prodiuretic hormone carries sodium.

b.There are specific transport proteins in the blood that deliver the minerals to the cell cytoplasm.

c.The balance of insulin and glucagon determines the movement of these minerals into and out of cells.

d.There are transport proteins within the cell membrane that pick up and release the minerals across the membrane.

67.Which of the following proteins inactivates foreign bacteria and viruses?

a.enzymes

b.collagen

c.hormones

d.antibodies

68.The body’s usual response to detection of antigens is to synthesize which of the following?

a.thyroxin

b.antibodies

c.erythrocytes

d.ammonia

69.Which of the following describes the structure of an antibody?

a.tripeptide

b.small nucleic acid

c.huge protein molecule

d.large peptide molecule

70.What is opsin?

a.an antigen

b.an antibody

c.a light-sensitive protein

d.a blood transport protein