At the 16-cell stage, the conceptus is known as a(n)
A. trophoblast.
B. blastocyst.
C. embryoblast.
D. morula.
E. zygote.
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Question 2) The trophoblast is located at the
A. periphery of the blastocyst.
B. center of the blastocyst.
C. periphery of the morula.
D. center of the morula.
E. center of the embryoblast.
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Question 3) Cleavage occurs during
A. the fetal period.
B. the pre-embryonic period.
C. organogenesis.
D. the embryonic period.
E. fertilization.
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Question 4) Sperm undergo a process of conditioning known as __________ after they arrive in the female reproductive tract.
Fill in the blank with correct word.
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Question 5) Which type of gamete remains viable for a longer time after it enters the female reproductive tract?
A. Sperm
B. Egg
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Question 6) Capacitation lasts several ________ and involves removal of ___________.
A.
seconds; lipids from the surface of the egg
B.
hours; proteins from the surface of the sperm
C.
days; carbohydrates from the surface of the egg
D.
weeks; glycolipids from the surface of the sperm
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Question 7) After ovulation, the oocyte
A. waits passively for a sperm to penetrate.
B. releases negative ions that create an electrical gradient that all sperm swim toward.
C. releases chemotaxic signals to attract sperm to its location.
D. propels itself toward seminal fluid by calcium-dependent kinesis.
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Question 8) What is the correct order of structures through which the sperm penetrates during fertilization?
A. Corona radiata, oocyte plasma membrane, zona pellucida
B. Zona pellucida, corona radiata, oocyte plasma membrane
C. Corona radiata, zona pellucida, oocyte plasma membrane
D. Zona pellucida, oocyte plasma membrane, corona radiata
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Question 9) The pre-embryonic period ends when
A. a morula is formed.
B. the zygote undergoes cleavage.
C. the blastocyst implants in the uterus.
D. the morula develops a trophoblast.
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Question 10) The maturation that occurs within the pre-embryonic and embryonic periods is known as __________.
Fill in the blank with correct word.
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