Which one of the following is a CORRECT statement regarding metabolism?
A) Few living organisms require raw materials and a constant source of energy.
B) Plants get the raw materials they need for life processes entirely from the air.
C) Cells maintain life through the breakdown of molecules and energy by chemical and physical processes.
D) Cells do not require energy to change molecules from one form to another.
E) Animals use energy obtained directly from the sun and chemicals obtained from plants, other animals, air, and water.
C
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Which of the following is a step in a PCR?
A. DNA is cooled to a temperature at which the hydrogen bonds holding the strands break. B. The primers anneal to the complementary sequences on the template DNA C. DNA gyrase enzyme relieves the supercoiling ahead of the replication fork. D. The DNase I synthesizes a new strand of DNA that is complementary to the template DNA.
What is the correct rank order for relative amount of water (most to least) required for excretion of the primary nitrogenous wastes generated by different animals?
A. ammonia ? urea ? uric acid B. uric acid ? ammonia ? urea C. urea ? uric acid ? ammonia D. ammonia ? uric acid ? urea E. urea ? ammonia ? uric acid
Which type of substrate is most likely to contain fossils? a. All of these choices
b. Shale c. Sedimentary rock d. Sandstone e. Mudstone
The center for control of motor skills and posture is the ____.
A. cerebrum B. medulla oblongata C. cerebellum D. brain stem E. hypothalamus