Which teratogen causes the most birth defects?
A. Alcohol
B. Thalidomide
C. HIV virus
D. Radiation
E. Nicotine
Answer: A
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The number of bones in the adult human skeleton is ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following enzymes would be most active in the presence of a high concentrations of protein fragments?
A. amylase B. lipase C. trypsin D. dextrinase
Because of the active transport of Na+ and K+, the intracellular concentration of Na+ is lower than the extracellular concentration, whereas the reverse is true for K+.
Answer the following statement true (T) or false (F)
Why does the superior part of the esophagus contain skeletal muscle instead of smooth muscle?
A. The second phase of swallowing is under involuntary control. B. The first phase of swallowing is under voluntary control. C. The second phase of swallowing is under voluntary control. D. The first phase of swallowing is under involuntary control.