The effect of mechanical stress on a bone is to
a. make it weaker.
b. prompt the formation of new bone.
c. cause the development of osteoporosis.
d. reduce a bone's calcium content.
e. cause osteoarthritis.
B
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The rates of evolutionary change in DNA:
A. are highly variable among different gene families. B. are constant in gene families with a diversity of members. C. can only be determined in conserved genes. D. are constant among different gene families and thus are used to estimate the time of divergence. E. are zero.
Which of the following regions of a structural gene contains the information that specifies an amino acid sequence?
A. promoter region B. transcribed region C. terminator D. regulatory sequence E. enhancer region
In phloem movement, ____ cannot serve as a sink
a. young leaves b. young roots c. developing fruits d. tulip bulbs after the plant has bloomed e. soil
Which of the following air-filled respiratory system structures are common in insects?
a. gills b. tracheal tubes c. lungs d. integumentary surfaces e. air sacs