Explain how a diving marine mammal increases its supply of stored O2, in spite of the fact that its lungs are
collapsed at depths below 25 meters.
What will be an ideal response?
ANSWER: Marine mammals increase their stores of O2 by: (1) increasing size-relative blood volume,
(2) increasing erythrocyte concentrations, and (3) increasing myoglobin concentrations in
the muscles.
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What structures are found along lymphatic vessels and are heavily clustered in the armpit, groin, and neck?
A. Lymph nodes B. Thymus C. Spleen D. GALT E. Tonsils
What does Vibrio fischeri use to communicate?
A. Bioluminescence B. Physical contact C. Secreted chemicals D. Electrical impulses
Which of the following statements regarding enzymes is FALSE?
A) Enzymes are proteins that function as biological catalysts. B) Enzymes are highly specific for the molecules to which they attach. C) The activity of enzymes can be regulated by factors in their environment. D) Enzymes provide energy for the reactions they catalyze. E) An enzyme may be used many times for the same specific reaction.
Which of the following statements about cranial nerves is not true?
A. Humans have 31 pairs of cranial nerves. B. Some cranial nerves are only sensory nerves, while some are only motor fibers. Others are mixed. C. The vagus nerve is a cranial nerve. D. Cranial nerves are largely associated with the head, neck, and face. E. The cranial nerves are referred to by roman numerals.