The acrosome reaction is triggered by
A. capacitation of sperm.
B. estrogen.
C. deposition of sperm into the female reproductive tract.
D. binding of the heads of sperm to the zona pellucida.
E. the first meiotic reduction division of the ovum.
Answer: D
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A powerful bronchoconstrictor released by mast cells is ________.
Fill in the blank(s) with the appropriate word(s).
Current research indicates that stomach cancer may originate from ________ cells that enter the stomach to repair damage to the stomach lining.
A. phagocytic B. stem C. bone marrow D. muscle
The resistance is in the middle of a ________-class lever.
Fill in the blank(s) with the appropriate word(s).
If water accumulates between two sheets of glass, it is very difficult to separate them. Which of the following explanations best explains this situation?
A. The adhesive property of water holds the sheets of glass together. B. The cohesive property of water holds the two sheets of glass together. C. The nonpolar covalent bonds in the class are attracted to the polar covalent bonds of the water, holding the two sheets of glass together.