Which part of an antibody attaches to an antigen?
A. The variable region
B. The constant region
C. The hinge region
D. The heavy chain
Answer: A
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The hormone oxytocin aids the birth process by stimulating
A) an increase in estrogen secretion. B) an increase in progesterone secretion. C) fetal muscular movements. D) uterine wall contractions.
A hormone called ________ is produced by the thyroid gland and stimulates osteoblast activity.
Fill in the blank(s) with the appropriate word(s).
Carbonic acid reversibly dissociates to form what two products, without the need of an enzyme?
A) water and carbon dioxide B) water and hydrogen ion C) water and bicarbonate D) carbon dioxide and bicarbonate E) bicarbonate and hydrogen ion
Atherosclerosis is
A. associated with low blood levels of cholesterol and heavy exercise. B. more common in younger people than in older people. C. the major cause of heart attacks. D. a disease in which the walls of arteries become more compliant. E. a thinning in the walls of arteries.