Identify the principal role of photosynthesis
A) To convert solar energy into the chemical energy of sugars
B) To convert kinetic energy into the chemical energy of sugars
C) To convert the chemical energy of sugars into the chemical energy that fuels life's processes
D) To convert the chemical energy of sugars into heat to maintain an elevated body temperature
Ans: A) To convert solar energy into the chemical energy of sugars
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The modern human skull lacks:a
a rounded or U-shaped arrangement of teeth. b. supraorbital ridges. c. a large brain case (cranium). d. small canine teeth. e. a foramen magnum
Which statement best describes the mechanism of neutralization?
A) Antigens clump together and are more susceptible to phagocytosis. B) Cells are neutralized by toxins injected by natural killer cells. C) It causes pathogenic cells to lyse. D) An antibody blocks an antigen's activity by binding to it. E) Pathogens are bound by antibodies and are more susceptible to phagocytosis
Which of the following would be correctly described as a juxtacrine signaling?
A) a signal that requires physical contact between cell B) a signal that acts on the cell that produces it C) a signal that diffuses over long distances from the producing cell D) a signal that diffuses over short distances from the producing cell E) a hormonal signal
Phosphofructokinase is an allosteric enzyme that catalyzes the conversion of fructose 6-phosphate to fructose 1,6-bisphosphate, an early step of glycolysis. In the presence of oxygen, an increase in the amount of ATP in a cell would be expected to _____
A) inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle. B) activate the enzyme and thus slow the rates of glycolysis and the citric acid cycle. C) inhibit the enzyme and thus increase the rates of glycolysis and the citric acid cycle. D) activate the enzyme and thus increase the rates of glycolysis and the citric acid cycle. E) inhibit the enzyme and thus increase the rate of glycolysis and the concentration of citrate.