Bone recycling allows the body to regulate what?
A. the amount of vitamin C in the blood
B. the amount of sodium in the bone
C. the amount of vitamin D in the bone
D. the amount of sodium in the blood
E. the amount of calcium in the blood
Answer: E
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Which level of protein structure do the ?-helix and the ?-pleated sheet represent?
A) primary B) secondary C) tertiary D) quaternary E) primary, secondary, tertiary, and quaternary
A human female haploid cell has which sex chromosome combination?
a. XX b. XY c. YY d. X e. Y
For a bike racer to maintain the lead during the Tour de France, s/he would be relying on:
a. anaerobic metabolism of glucose as the primary energy source. b. ATP stored in the muscle as the primary energy source. c. creatine phosphate as the primary energy source. d. insulin to convert glycogen to glucose for energy. e. the anaerobic metabolism of lactic acid.
Which of the following statements regarding photosynthesis and cellular respiration is true?
A) Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria. B) Photosynthesis occurs in mitochondria, and cellular respiration occurs in chloroplasts. C) Photosynthesis occurs in mitochondria and in chloroplasts. D) Cellular respiration occurs in mitochondria and in chloroplasts.