About twelve to twenty-four hours after the
previous meal, a person's blood-sugar level
normally varies from 60 to 90 milligrams per
100 milliliters of blood, though it may rise to
130 mg/100 ml after meals high in
carbohydrates. That the blood-sugar level is
maintained within a fairly narrow range despite
uneven intake of sugar is due to the body's
ability to carry out
a. adaptation.
b. inheritance.
c. metabolism.
d. homeostasis.
e. all of these processes.
D
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The reactions in glycolysis are reversible; however, the conversion of pyruvate into acetyl CoA is irreversible in animal cells. Can fatty acids be converted back into carbohydrates?
A. Yes, because they enter metabolism in the Krebs cycle. B. No, because they enter metabolism as acetyl CoA. C. No, because they enter metabolism as pyruvate. D. Yes, because they enter metabolism as acetyl CoA. E. Yes, because they enter metabolism as pyruvate.
The insects were the first organisms to
a. show bilateral symmetry. b. exhibit segmentation. c. fly. d. develop lungs.
Which of the following statements about the fundamental and realized niche are true? Check all that apply.
_____ A species' realized niche could be the same size as its fundamental niche. _____ A species' realized niche could be smaller than its fundamental niche. _____ A species' fundamental niche can be smaller than its realized niche. _____ The extent of the realized niche is determined, in part, by interspecific competition. _____ The extent of the fundamental niche is determined, in part, by conditions of the physical environment.
Pinpointing the location and size of tumors can be accomplished through ____
a. DNA probes b. biopsy c. x-rays d. MRI e. radioactive monoclonal antibodies