________ is a steroid hormone.
a. vitamin D
b. Epinephrine
c. insulin
d. all of these
Answer: a. vitamin D
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Superoxide dismutase and catalase work together to convert superoxide into
A) peroxide. B) oxygen. C) ozone. D) water.
About twelve to twenty-four hours after the previous meal, a person's blood-sugar level normally varies from 60 to 90
milligrams per 100 milliliters of blood, though it may rise to 130 mg/100 ml after meals high in carbohydrates. That the blood-sugar level is maintained within a fairly narrow range despite uneven intake of sugar is due to the body's ability to carry out
a. adaptation. b. inheritance. c. metabolism. d. homeostasis.
e. evolution.In humans, the muscular tube into which urine from the kidney first drains is the
A. urethra. B. uvula. C. ureter. D. urinary bladder. E. nephron.
The living organism that provides nutrients for a parasite is the
A. prey. B. host. C. predator. D. scavenger.