Following statements are regarding to recognition of sperm by mammalian zona pellucida.

A. Sperm that have undergone the acrosome reaction bind directly to zona protein ZP2 and begin making a channel toward the oocyte.

B. Sperm with an intact acrosome bind to ZP2; they undergo the acrosome reaction on the zona pellucida and then transfer their binding to ZP3.

C. When a sperm reaches the oocyte and fuses with it, the cortical granules release proteins that digest portions of ZP2 and ZP3, making them nonfunctional and prevent polyspermy.

D. When a sperm reaches the oocyte and fuses with it, the cortical granules release proteins that digest ZP3 only, not ZP2 because ZP2 involve in the process of slow block to polyspermy.

Which of the above statements are correct?

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#Question id: 23646

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An elevator has the capacity of 12 adults or 20 children. How many adults can board the elevator with 15 children?

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#Question id: 23645

#General Aptitude

If 15 apples and 20 oranges cost as much as 20 apples and 15 oranges. How do you compare the costs of two?

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#Question id: 23644

#General Aptitude

There are some cows, bulls and 45 hens in a group. One care taker looks after 15 animals. The number of bulls is twice the number of cows. If the number of head is less than the total number of feet by 186(including the care taker), how many care takers are there?

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#Question id: 23643

#General Aptitude

A straight line is 36 cm long. the points are to be marked on the line from both the ends so that the first point be at a distance of 1 cm from one end, the second point be at a distance of 2 cm from the first point and the third point be at a distance of 3 cm from the second point and so on. If the points on the ends are not counted and the common points are counted as one, what is number of points?

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#Question id: 23642

#General Aptitude

A man invited some boys and girls on the birthday of his son. The number of boys was less than that of girls by 2.He gave Rs.10 to each boy and Rs.20 to each girl. If total amount distributed by him is Rs.280, what was the number of boys?

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#Question id: 23641

#General Aptitude

A class starts after lunch at 1.00p.m. and lasts till 3.52 p.m. In this duration four periods are held. Before every period 4 minutes are allowed for going from one room to another. What is the exact duration for each period?