Which of the following is NOT a function of proteins in the body?
A. Enzymes
B. Receptors for regulator molecules
C. Compose genes
D. Carriers for membrane transport
Answer: C
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Which statement accurately describes alveolar exchange of oxygen?
A. Oxygen diffuses from the alveolus to the blood because the alveolus has a higher partial pressure of oxygen. B. Oxygen diffuses from the alveolus to the blood because the alveolus has a lower partial pressure of oxygen. C. Oxygen diffuses from the blood to the alveolus because the alveolus has a higher partial pressure of oxygen. D. Oxygen diffuses from the blood to the alveolus because the alveolus has a lower partial pressure of oxygen.
The brain relies solely on ________ as its energy source. If it is deprived of this substrate, the cells soon die.
A) amino acids B) insulin C) fatty acids D) glucose
Oxygen and carbon dioxide are exchanged across the respiratory membrane by the process of ________.
A. active transport B. cotransport C. diffusion D. osmosis E. filtration
Anaphase is characterized by ________
A) separation of the sister chromatids B) breakdown of the nuclear membrane C) duplication of the chromosomes D) division of the cytoplasm