How many cells does meiosis produce from one primary cell?
A. One
B. Four
C. Two
D. Three
E. Eight
Answer: B
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Which of the following does NOT correctly describe cardiac muscle cells?
A. They are much shorter than skeletal muscle fibers, and generally have a single nucleus. B. They can contract in the absence of external calcium. C. Their membranes are depolarized initially by the influx of sodium ions. D. They depolarize prior to contraction. E. They are arranged in layers surrounding hollow cavities in the heart.
Each triplet of bases in a gene corresponds to
A) one amino acid in a protein. B) one DNA nucleotide. C) one protein. D) one mRNA. E) one chromosome.
Which of the following does not turn off the thirst center of the brain?
A. Decreased blood osmolarity B. Entry of fluid in the stomach C. Decreased salivary secretions D. Increased blood pressure
What molecule cannot be used for gluconeogenesis?
A) pyruvate B) glucogenic amino acids C) fatty acid D) glycerol