Your Research Project Involves Sea Cucumbers,a Poorly-Understood Group of Echinoderms

question 69

Multiple Choice

Your research project involves sea cucumbers,a poorly-understood group of echinoderms.You are trying to determine whether they block polyspermy by changing membrane potential like sea urchins do.In the chart below,you have counted the number of embryos that complete normal development after fertilization in either normal or low-sodium artificial sea water (ASW) ,for each of three sets of experiments.Looking over your data,what do you conclude?

• A)Sea cucumbers appear not to block polyspermy the same way as sea urchins,which use an influx of Na⁺ that changes the membrane potential.
• B)Sea cucumbers appear not to block polyspermy the same way as sea urchins,which use an outflow of Na⁺ that changes the membrane potential.
• C)Sea cucumbers appear to block polyspermy the same way as sea urchins,via an influx of Na⁺ that changes the membrane potential.
• D)Sea cucumbers appear to block polyspermy the same way as sea urchins,via an outflow of Na⁺ that changes the membrane potential.

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Definitions:

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