Test Bank for Langmans Medical Embryology 8th edition.

, Test Bank ix 1-2


Moore: The Developing Human, 8th Edition
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Test Bank ix




Gametogenesis and Fertilization ix ix




MULTIPLE CHOICE ix




Directions: Each group of questions below consists of a numbered list of
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descriptive words or phrases accompanied by a diagram with certain parts
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indicated by letters or by a list of lettered headings. For each numbered word or
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phrase, select the lettered part or heading that matches it correctly and then insert
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the letter in the space to the right of the appropriate number. Sometimes more
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than one numbered word or phrase may be correctly matched to the same lettered
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part or heading.
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1. ________ Haploid nuclei that fuse to form a zygote
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a. Polar body ix


b. Capacitation
c. Acrosome
d. Zona pellucida ix


e. Pronuclei
ANS: E
The male and female pronuclei are the haploid nuclei of the sperm and oocyte,
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respectively. They fuse during fertilization to form the diploid nucleus of a
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zygote. The nucleus occupies most of the head of the sperm, and after it enters
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the oocyte, it swells to form the male pronucleus. The pronuclei are about equal
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in size and show similar features.
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2. ________ Changes occur in it that inhibit entry of sperm
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a. Polar body ix


b. Capacitation
c. Acrosome
d. Zona pellucida ix


e. Pronuclei
ANS: D
The zona pellucida undergoes changes, called the zona reaction, when a sperm
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contacts the cell membrane of a secondary oocyte. These changes, caused by the
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release of substances from the oocyte, prevent other sperms from passing through
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the zona pellucida and entering the oocyte.
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3. ________ Contains enzymes that digest a path for the sperm
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a. Polar body ix


b. Capacitation



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