Blood calcium level is regulated in part by _________ a hormone secreted by the thyroid gland when the blood calcium level rises.
A) serotonin.
B) parathyroid.
C) calcitonin.
D) estrogen.
Answer: C) calcitonin.
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If Lyme disease is not treated early, it can infect the central nervous system
Indicate whether the statement is true or false.
Due to ________, the 25,000 genes of the human genome seem to encode as many as 120,000 different expressed mRNAs.
A. independent assortment B. alternative splicing C. mutations D. recombination
How many net ATP molecules are produced per molecule of glucose broken down during glycolysis?
A. One B. Two C. Four D. 36 E. 38
Which statement most accurately describes the evolutionary relationships among the three domains?
A. Bacteria and Eukarya diverged from a common ancestor more recently than they diverged from their common ancestor with Archaea. B. Bacteria and Archaea diverged from a common ancestor more recently than they diverged from their common ancestor with Eukarya. C. All three domains diverged from a common ancestor at the same time. D. Eukarya and Archaea diverged from a common ancestor more recently than they diverged from their common ancestor with Bacteria.