In Sea Urchins, the "Fast Block" and the Longer Lasting

question 60

Multiple Choice

In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are ________.

• A) the acrosomal reaction and the formation of egg white
• B) the cortical reaction and the formation of yolk protein
• C) the jelly coat of the egg and the vitelline membrane
• D) membrane depolarisation and the cortical reaction

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Definitions:

Photographic Plates

Flat sheets of metal or glass coated with a photosensitive chemical used to capture images in traditional photography.

Radioactive Materials

Substances that emit radiation as a result of nuclear decay, used in a variety of applications but also associated with health risks.

Radioactivity

The process by which atoms emit energy in the form of particles or electromagnetic waves due to the decay of their unstable nuclei.

Phosphorescence

A type of photoluminescence related to fluorescence, but in which a material emits light for a longer period after the initial excitation energy is supplied.