One of the following enzymes found in some bacteria which can break down toxic hydrogen peroxide into water and oxygen is
a) superoxide dismutase.
b) peroxidase.
c) hydroxylase.
d) catalase.
Answer: d) catalase.
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Blood is closely maintained at a pH of 7.4. A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma. What happens to the concentration of H+ ions in a patient with a blood pH of 6.4?
A. H+ concentration is decreased 10-fold. B. H+ concentration is decreased 2-fold. C. H+ concentration is increased 10-fold. D. H+ concentration is increased 2-fold. E. H+ concentration is decreased 4-fold.
How many of the animal phyla include single-celled animals?
A. 0 B. 4 C. 2 D. 1
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are produced by the
A. pancreas. B. anterior pituitary gland. C. pineal gland. D. hypothalamus. E. posterior pituitary gland.
Wolves feed on small and large mammals. Because they hunt and feed on other organisms, wolves are called
a) prey b) predators c) hunters d) hosts