In sea urchins, which of the following pairs of events most directly results in the short-lasting "fast block" and the longer-lasting "slow block" polyspermy, respectively? O formation of the jelly coat and the vitellin membranes O the cortical reaction and the formation of yolk protein O the acrosomal reaction and vitellogenesis O membrane depolarization and the cortical reaction

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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O potassium ions
O sodium ions
Question 18
In sea urchins, which of the following pairs of events most directly results in the short-lasting "fast block" and the longer-lasting "slow block" to
polyspermy, respectively?
O formation of the jelly coat and the vitellin membranes
O the cortical reaction and the formation of yolk protein
O the acrosomal reaction and vitellogenesis
O membrane depolarization and the cortical reaction
Question 19
Which of the following correctly describes a difference between the vegetal pole of a frog zygote and the animal pole?
O The blastomeres originate only in the vegetal pole.
O The vegetal pole has a higher concentration of yolk.
O The polar bodies bud from this region.
The vegetal pole cells undergo mitosis, but not cytokinesis.
1
Transcribed Image Text:O potassium ions O sodium ions Question 18 In sea urchins, which of the following pairs of events most directly results in the short-lasting "fast block" and the longer-lasting "slow block" to polyspermy, respectively? O formation of the jelly coat and the vitellin membranes O the cortical reaction and the formation of yolk protein O the acrosomal reaction and vitellogenesis O membrane depolarization and the cortical reaction Question 19 Which of the following correctly describes a difference between the vegetal pole of a frog zygote and the animal pole? O The blastomeres originate only in the vegetal pole. O The vegetal pole has a higher concentration of yolk. O The polar bodies bud from this region. The vegetal pole cells undergo mitosis, but not cytokinesis. 1
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