Match the following mechanism of polyspermy (Column I) with events (Column II).

Column I	Column II
A. Fast block to polyspermy	i. chemicals from the fusing sperm cytoplasm alter the sodium ion (Na+) channels on the membrane
B. Slow block to polyspermy	ii. enzyme cortical granule serine protease, cleaves the protein posts that connect the vitelline envelope
	iii the concentration of free Ca2+ in the egg cytoplasm increases
	iv. an electric change in the egg cell membrane
	v. the concentration of free Na+ in the egg cytoplasm increases

Which of the following is correct?

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#Question id: 15146

#Unit 8. Inheritance Biology

You have isolated a set of five yeast mutants that form dark red colonies instead of the usual white colonies of wild-type yeast. You cross each of the mutants to a wild-type haploid strain and obtain the results shown below;

What do these results tell you about each of the mutants?

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#Question id: 3893

#Unit 3. Fundamental Processes

Protein structural motifs often have general functions in common.  Which one of the following motifs is known to be involved in protein dimer formation, but not in direct protein-DNA interactions?

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#Question id: 940

#Unit 1. Molecules and their Interaction Relevant to Biology

Transamination reactions require which coenzyme?

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#Question id: 17072

#Unit 12. Applied Biology

Plastic Film, Teflon (fluoroethylenepropylene copolymer) is biologically inert and are extensively used for monolayer and suspension cultures as thry are

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#Question id: 26914

#Unit 10. Ecological Principles

Some given statements about anti freezing are given;

a.some invertebrates to withstand temperatures as low as –18°C without freezing, in presence of glycoproteins

b.Sodium, potassium, or chloride ions involve to increasing  the blood freezing point, so the lack of these ions some species help to lower the blood freezing point

c.Amphibians release large amount of glucose into the blood to prevent freezing of blood in cold

d.Sodium, potassium or urea function as anti freezing in their blood

e.Glycine causes supercooling in plants

Which of the following statements about supercooling/anti freezing is correct?