Biology, Eighth Edition (Raven)

Chapter 53: Animal Development

Pre Test

1
The acrosome: (p.1088)
A)is the outer layer of an egg.
B)is a structure on the sperm that is used to penetrate the egg.
C)contains digestive enzymes.
D)occurs only in sea urchin sperm.
E)both b and c
2
The process of cleavage: (p. 1092)
A)results in an increase in the overall size of the embryo.
B)is the event following fertilization.
C)is rapid division of the zygote into many cells.
D)has the same pattern in all animals.
E)both b and c
3
The significance of gastrulation is that it: (p 1094)
A)increases the size of the embryo.
B)forms two primary germ layers.
C)converts the blastula into bilaterally symmetrical embryo.
D)converts the gastrula into bilaterally symmetrical embryo.
E)both b and c
4
In vertebrates organogenesis begins with the formation of the: (p. 1100)
A)somites and the dorsal nerve chord.
B)notochord and the neural crest.
C)notochord and the dorsal nerve chord.
D)somites.
E)neural crest and the dorsal nerve chord.
5
In vertebrate development clusters of cells called a (an) _________ release diffusible ________ that stimulate the development of different organs. (p. 1105)
A)node/morphogens
B)organizer/morphogens
C)organizer/inductants
D)node/inductants
E)none of the above
6
During pregnancy the placenta secretes estrogen and progesterone. The result of this is: (p. 1110)
A)the maintenance of the uterus.
B)the release of hCG is stimulated.
C)the release of FSH and LH is stimulated, preventing ovulation.
D)the release of FSH and LH is inhibited, preventing ovulation.
E)both a and d
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