The most recent major extinction event ________
a. happened at the end of the Devonian period
b. occurred 65 million years ago, when dinosaurs went extinct
c. happened at the end of the Triassic period
d. is under way now
d
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The umbilical cord functions to
(a) carry waste products in the blood from the fetus to the mother. (b) carry waste products in the blood from the mother to the fetus. (c) carry oxygen in the blood from the mother to the fetus. (d) do both a and c.
A(n) ________ operon is one whose transcription is repressed by effector molecules.
A. activated B. repressible C. inducible D. coinducible E. compressible
In every physical or chemical change, energy cannot be created nor destroyed. This is the ________ law of thermodynamics.
Fill in the blank(s) with the appropriate word(s).
In aerobic cellular respiration, the actual ATP yield from a molecule of glucose is ATP molecules.
A. 4 B. 30 C. 42 D .2 E. 15