Essi78654
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#1
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1) cover cells
2) cell membrane, Cytoplasm
3) Protein synthases
4)The movement of molecules from a higher concentration to a lower concentration
5) 6 marker
factors affecting photosynthesis: light intensity and temperature
0.04%=16 units
percentage increase was 25%
cell division question = 4
ethical problem = killing life
good thing = healthier baby
Possibility of next child having diseases = 1/4
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Wiggiebob
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I have a friend who makes a strong case for the cell division question actually being 15, because technically in order to obtain 16 cells from 1, the total number of divisions is 15.
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AJ2104
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(Original post by Wiggiebob)
I have a friend who makes a strong case for the cell division question actually being 15, because technically in order to obtain 16 cells from 1, the total number of divisions is 15.
1 parent cell splits into 2 daughter cells. These 2 cells then split to make 4. The 4 then split to make 8. Then the 8 split to make 16.

The specification backs this up as it refers to two divisions producing four daughter cells.
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Wiggiebob
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(Original post by AJ2104)
1 parent cell splits into 2 daughter cells. These 2 cells then split to make 4. The 4 then split to make 8. Then the 8 split to make 16.

The specification backs this up as it refers to two divisions producing four daughter cells.
Yes what you are stating is correct, but the question asked the number of times the cell divides. So to use your example, we start with 1 cell, which divides into 2 cells(that's 1 division). Then the 2 daughter cells both divided to make 4 cells(so that is 2 divisions, added to the 1 previously equals a total of 3 divisions). Then those 4 cells each divide into 2 cells to make a total of 8 cells (so that means 4 divisions added to the 3 previously equals 7 total divisions). Then those final 8 cells become 16 cells(8 divisions added to the previous 7 division = 15 total division). Therefore the total number of divisions from 1 cell to 16 cells(not the number of stages) is 15 divisions.

We have discussed this answers among a group of friends and all of us agree that this answer is technically correct, despite all of us but him having put 4 and not 15. Nevertheless, we believe that the mark scheme will be looking for 4, despite the technical answer being 15.
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georgethe
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would 15 units be right?
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AJ2104
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(Original post by georgethe)
would 15 units be right?
If you're talking about the graph question, it was 16 units as each small square was 1 unit. At 0.04% the result was 1 small square above the 15 line, so it would be 16.
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