Biology (Raven), 10th Edition

Chapter 53: Animal Development

Pre-Test

1
A sperm's _____ releases digestive enzymes that penetrate the egg's protective layers
A)membrane
B)nucleus
C)cytoplasm
D)acrosome
E)chorion
2
Which of the following factors is the primary inluence of cleavage patterns?
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 determines its ultimate function to a large extent.
A)temperature
B)enzyme profile
C)cleavage pattern
D)location
E)pH
4
What do Wnt genes affect in the dorsal vegetal cells of a frog's Nieuwkoop center?
A)mRNAs that promote morphogenesis
B)proteins that affect induction
C)a transcription factor that affect organizer specification
D)genes that affect the dorsal-ventral axis
E)a transcription factor that affect clustering
5
When does organogenesis begin in humans?
A)the third trimester of pregnancy
B)the second trimester of pregnancy
C)cleavage
D)gastrulation
E)the fourth week of pregnancy
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