# OCR AS Level Biology exam question?

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#1
I've tried this question so many times, it's worth one mark but I still don't understand what exactly I'm supposed to do.

Individual cells of D. discoideum can divide once every hour. A grey may consist of 100,000 individual cells.
Calculate how many hours it would take for one cell to produce enough cells to form a grex?
This is all the information they give and I am so lost..
pls help?
0
7 years ago
#2
Lol nevermind.
1
7 years ago
#3
(Original post by _Aqsxo)
I've tried this question so many times, it's worth one mark but I still don't understand what exactly I'm supposed to do.

Individual cells of D. discoideum can divide once every hour. A grey may consist of 100,000 individual cells.
Calculate how many hours it would take for one cell to produce enough cells to form a grex?
This is all the information they give and I am so lost..
pls help?
2 ways to do this question. The logic way or the maths way.

The maths way is to use logs. Every generation the population doubles (i.e. times by 2). This means 2^x = 100,000 where x is the number of hours. Use logs so log2(100,000) = 16.6 therefore 17 hours.

The logic ways is that every generation the population doubles. Start with 1 and keep doubling until you get over 100,000. 1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768 65536 131072. Count the number of doublings. 17 doublings so 17 hours.
5
1 month ago
#4
(Original post by Munrot07)
2 ways to do this question. The logic way or the maths way.

The maths way is to use logs. Every generation the population doubles (i.e. times by 2). This means 2^x = 100,000 where x is the number of hours. Use logs so log2(100,000) = 16.6 therefore 17 hours.

The logic ways is that every generation the population doubles. Start with 1 and keep doubling until you get over 100,000. 1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768 65536 131072. Count the number of doublings. 17 doublings so 17 hours.
thank you sooo much
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