# Biology past paper question?

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#1
http://filestore.aqa.org.uk/subjects...2-QP-JUN12.PDF
It is question 4)c)
& it has me baffled.
What does it mean by "these" cells. All 200? Because 180 of them are in interphase, so 180 of them will take the full 20 hours, the 6 A cells will take 3/5ths of the cell cycle, which is (20*60)/5 = 240 minutes
then 240*3 = (3/5ths) = 720 minutes

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5 years ago
#2
(Original post by Danny.L)
http://filestore.aqa.org.uk/subjects...2-QP-JUN12.PDF
It is question 4)c)
& it has me baffled.
What does it mean by "these" cells. All 200? Because 180 of them are in interphase, so 180 of them will take the full 20 hours, the 6 A cells will take 3/5ths of the cell cycle, which is (20*60)/5 = 240 minutes
then 240*3 = (3/5ths) = 720 minutes

It means how long will it take an individual cell to carry out mitosis on average.
Mitosis takes up (200-180)/200 = 1/10th of the cycle in terms of time.

The entire cycle is 20 hours, so mitosis takes 20(1/10) = 2 hours.
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