Multiple Choice Quiz

Please answer all questions


1	How does the oocyte assure that only one sperm cell enters it during fertilization?
		A)	An acrosomal reaction occurs.
		B)	The corona radiata slows the progress of all but the strongest sperm cells.
		C)	The zona pellucida becomes impenetrable after one sperm cell enters.
		D)	The position of the oocyte in the uterine tube restricts access for most sperm.


2	What portion of the blastocyst actually becomes the developing embryo?
		A)	the trophoblast
		B)	the blastocyst cavity
		C)	the chorion
		D)	the embroblast


3	What cells of the implanted blastocyst secrete the hormone chorionic gonadotropin to maintain the pregnancy?
		A)	syncytiotrophoblasts
		B)	cytotrophoblast
		C)	embryoblast
		D)	embryonic endoderm


4	The skeleton, muscles, blood, reproductive organs, dermis of the skin, and connective tissue arise from the __________________.
		A)	endoderm
		B)	mesoderm
		C)	ectoderm
		D)	trophoblast


5	Which extraembryonic membrane gives rise to the fetal umbilical arteries and vein?
		A)	allantois
		B)	chorion
		C)	yolk sac
		D)	amnion


6	The ________________ is the outermost extraembryonic membrane and contributes to the formation of the placenta.
		A)	allantois
		B)	chorion
		C)	yolk sac
		D)	amnion


7	Which of these is not a hormone secreted by the placenta?
		A)	chorionic gonadotropin
		B)	chorionic omatomammotropin
		C)	progesterone
		D)	All of these are secreted by the placenta.


8	During the third week of development, the _______________ that is the basis of the embryonic skeleton, appears.
		A)	connecting stalk
		B)	limb bud
		C)	notochord
		D)	digital ray


9	What is the earliest embryonic time period during which female and male genitalia begin to appear?
		A)	weeks 2-3
		B)	weeks 5-6
		C)	weeks 9-10
		D)	third trimester


10	During what stage of labor does the birth of the infant occur?
		A)	dilation stage
		B)	expulsion stage
		C)	placental stage
		D)	The infant may be delivered during any of these stages.


11	During what postnatal period do degenerative changes associated with aging begin?
		A)	childhood
		B)	adolescence
		C)	adulthood
		D)	senescence


12	A person who has inherited the gene for arched feet from both parents is said to be ________________ for that trait.
		A)	a carrier
		B)	recessive
		C)	homozygous
		D)	heterozygous


13	Hemophilia is an example of a trait that is carried as a ____________________.
		A)	autosomal dominant
		B)	autosomal recessive
		C)	sex-linked dominant
		D)	sex-linked recessive


14	What type of fetal monitoring is used to determine diseases such as hemophilia, thalassemia, and others?
		A)	ultrasonography
		B)	fetoscopy
		C)	amniocentesis
		D)	X-rays

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