Refer to the accompanying figure. The structures receiving air in figure 1 are known as:
a. anterior air sacs.
b. parabronchi.
c. spiracles.
d. alveoli.
e. tracheae.
a
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Which of the following statements is true?
a. Gene mutations occur independently of each other. b. Gene mutations are relatively rare. c. Ionizing radiation causes chromosomal damage and free radical formation. d. Mutations are random; that is, it is impossible to predict exactly when a specific gene will mutate, but an expected frequency can be assigned. e. All of these are true
According to the acid-growth hypothesis, auxin works by _____
A) dissolving sieve plates, permitting more rapid transport of nutrients B) dissolving the cell membranes temporarily, permitting cells that were on the verge of dividing to divide more rapidly C) changing the pH within the cell, permitting the electron transport chain to operate more efficiently D) increasing wall plasticity and allowing the affected cell walls to elongate E) greatly increasing the rate of deposition of cell wall material
The most common infectious disease(s) is/are
A) gonorrhea. B) influenza. C) hepatitis. D) colds.
Natural passive acquired immunity would result from:
A) having the measles. B) ingesting colostrum. C) receiving a gamma globulin injection. D) receiving a vaccine.