Hemoglobin in blood, collagen in tendons, and enzymes in the digestive system are all examples of
A. proteins.?B. lipids.?C. amino acids.?D. carbohydrates.?E. catalysts.
A
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When the carbonic acid-sodium bicarbonate buffer pair buffers lactic acid:
a. the amount of carbonic acid in the blood decreases b. the amount of carbonic acid in the blood increases c. the amount of bicarbonate in the blood increases d. both A and C above
Human chorionic gonadotropin (HCG)
A. is used to detect pregnancy. B. maintains the corpus luteum until the placenta is secreting hormones. C. keeps a new follicle from developing. D. All apply.
Which of the following joints are located in the skull?
a. Synarthroses. b. Amphiarthroses. c. Diarthroses. d. There are no joints in the skull.
Fingernails are comprised of
A. epithelial and collagen fibers produced in the dermis. B. proteins secreted by the nail groove from the matrix. C. collagen deposited by the lunula and the matrix. D. thin, dead scaly cells.