shiv26
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4bii) The time required for a cell to complete the cell cycle was 4hours 18mins. Calculate the time required in minutes for this cell to multiply to produce eight cells.

Answer in the markscheme = 774 minutes (so three cycles)

However, I believe the answer to be 516minutes. This is because the cell would undergo 1 cycle to produce 2 daughter cells. Then in the next 258minutes, these daughter cells would each produce 2 cells each, so 4 cells in this stage. During this time, the first cell would replicate again surely, producing another 2 daughter cells? In total creating 8 new cells.

Why am I not correct?
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steviep14
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Surely it is 3 Cycles?
1 - 2 - 4 -8
(1 Cycle) 1-2
(2 Cycles) 2-4
(3 Cycles) 4-8

4h 18m = 258m
258 x 3 = 774

774 Minutes = Answer
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steviep14
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Umm? How can it replicate again?

A goes to:
B and C (CYCLE 1) 258m
(A IS DONE)
B and C Remain (2 Cells)
_____________________________
B goes to:
D and E
(B IS DONE)

C Goes to:
F and G
(C IS DONE)
D, E, F and G Remain (4 Cells) - CYCLE 2 (516m)
___________________________
D goes to H and I
E goes to J and K
F goes to L and M
G goes to N and O
(D, E, F and G are DONE)

H,I,J,K,L,M,N,O Remain (8 Cells) - CYCLE 3 (774m)
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shiv26
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Ahhh, just realised how stupid I was being. Slightly embarrassing! Thanks
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steviep14
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No worries
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Kiran Ishtiaq
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(Original post by shiv26)
4bii) The time required for a cell to complete the cell cycle was 4hours 18mins. Calculate the time required in minutes for this cell to multiply to produce eight cells.

Answer in the markscheme = 774 minutes (so three cycles)

However, I believe the answer to be 516minutes. This is because the cell would undergo 1 cycle to produce 2 daughter cells. Then in the next 258minutes, these daughter cells would each produce 2 cells each, so 4 cells in this stage. During this time, the first cell would replicate again surely, producing another 2 daughter cells? In total creating 8 new cells.

Why am I not correct?
I think since there are four cells at that stage they will divide to produce two cells each...so four cells after dividing will give 8 cells in the end.
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