Biology (Raven), 9th Edition

Chapter 54: Animal Development

Pre-Test

1
A sperm's _____ releases digestive enzymes to penetrate the egg's external layers
A)membrane
B)nucleus
C)cytoplasm
D)acrosome
E)chorion
2
Cleavage patterns are primarily influenced by
A)the amount of yolk.
B)temperature.
C)compaction.
D)osmotic pressure.
E)presence of a notochord.
3
A cell's _____ in the developing embryo often determines its fate.
A)temperature
B)enzyme profile
C)cleavage pattern
D)location
E)pH
4
Turning on the Wnt pathway activates
A)morphogenesis.
B)induction.
C)organizer specification.
D)the dorsal-ventral axis
E)clustering.
5
In humans, organogenesis begin during
A)the third trimester.
B)the second trimester.
C)cleavage.
D)gastrulation.
E)the fourth week.
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