During early development, the Y chromosome produces a substance called testis determining factor (TDF) that causes the indifferent gonad to become a testis. This would be an example of
A) capacitation.
B) activation.
C) differentiation.
D) induction.
E) predilection.
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Question 2) After fertilization, the first cell division is completed
A) within a few seconds.
B) within the hour.
C) about 6 hours later.
D) in 12 hours.
E) about 30 hours later.
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Question 3) Each of the following is a component of the cerebral arterial circle except the ________ artery.
A) anterior communicating
B) anterior cerebral
C) posterior communicating
D) posterior cerebral
E) basilar
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Question 4) Which of the following statements concerning development is false?
A) The term induction refers to the chemical interplay between developing cells.
B) The developing oocyte receives molecules that affect development from the surrounding granulosa cells.
C) Each blastomere in the blastocyst receives exactly the same cytoplasmic composition.
D) Differences in a cell's cytoplasmic makeup affect the cell's genetic activity.
E) Cells release molecules that affect the developmental process of neighboring cells.
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Question 5) The fusion of the brachiocephalic veins forms the
A) inferior vena cava.
B) superior vena cava.
C) innominate vein.
D) subclavian vein.
E) azygos vein.
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Question 6) The human gestation period consists of
A) fertilization and one trimester.
B) two trimesters of 1 month each.
C) three trimesters of 1 month each.
D) two trimesters of 2 months each.
E) three trimesters of 3 months each.
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Question 7) The vein that is formed from the fusion of the subclavian with the internal and external jugulars is the ________ vein.
A) azygos
B) hemiazygos
C) axillary
D) iliac
E) brachiocephalic
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Question 8) The term ________ refers to the time spent in prenatal development.
A) transformation
B) micturition
C) parturition
D) gestation
E) cleavage
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Question 9) At the level of the first rib, the axillary vein becomes the ________ vein.
A) cephalic
B) azygos
C) subclavian
D) innominate
E) external jugular
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Question 10) The period of gestation when organs and organ systems complete most of their development and the fetus looks distinctly human is the ________ trimester.
A) first
B) second
C) third
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