67823
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Question 1
LIGHT INDEPENDENT REACTION (2)
Less ATP And less reduced NADP produced

Decrease in rubisco activity (2)

Rubisco where found(1)
Storma

Graph to evaluate (4)

Question2

Multiple choice (1)
2nd box

Alteration to Tumour supressor genes (3)
Tumour suppressor gene regulates cell division/ slows cell division
Methylation causes a gene to be switched off
Methylation of tumour suppressor gene lead to uncontrolled cell division

Number of cells produces when Cell divsion after every 8 hours (2)
1.93x10^25

Question 3

Why apparatus was left for a few hours (1)
Allow respiration rate to stabilise
Allow pressure change to occur

Why did Coloured liquid move to right (2)

Volume of gas produced (Potometer) (2)
0.049

Why Log was used (1)
Large number of cells present
More precise

Why do Yeast cells die in death phase (1)

Predicted size of yeast after 10 hours (2)
296826

Question 4

Working out percentage cover (3)
Split sand dune into grid.
Use random number generator to generate coordinates.
Randomly sample many times.
Calculate % cover/estimate cover.

Evidence of succession (4)
Grass is pioneer species so alters abiotic conditions such as wind speed.
Outcompeted and die and form humus.
Thus other species can grow.
Over time trees grow more as climax community forms, passing through many sereal stages.

Why over time photosynthesis decreases (1)
Mainly trees that grow so shade so block light from penetrating in/at lower surface

NPP IN 1000 years (2)

Question 5

One reason for same type of food (2)

Standard deviation (2)

High blood pressure (1)

Furosemide increaases urine production (3)

DifferNce in Rate of kidney blood flow (1)
1.3

Question 6

Why ratio was different (2)
Fertilisation is random
Small sample size

Gentype (1)
All 4 ressessive allele

Resluts in table 3 explanation(3)

Phenotype ratio (2)
9:3:3:1

Question 7

Dopamine stimualtion(3)

Moprhine and endorphins (2)

GABA & chlorine ion release (3)
Causes hyperpolisaton so depolaristion doesn’t occour and therefore action potentials don’t pass on

Question 8

Genome(1)
Complete range of genes in a cell

Antibodies(2)

What was white Precipitated DNA(1)

how does cDNA Prevent transcription (1)

Two enzymes in forming DNA fragments and role (2)
DNA ligase
Restriction endonuclease

Two features of protein gel electrophoresis (2)
Charge
Size

Question 9

How farming cattle could have led to an increase in LP(4)
mutation which continued production of lactase
-advantageous (as they can digest lactose) so more likely to survive and reproduce
-allele frequency increased
-directional selection mean shifted towards LP

Why LP rapidly increases (2)

Mutation in LP BUT MUTATION NOT IN LP GENES. Explain how (2)

Question 10

Damage to cone cells - why this causes colour blindness (3)

Hardy (2)
43%

In men more than women (2)
Men have one X chromosome so only one allele

Unable to distinguish between red and green(3)

how can iPS cells be used to treat colour blindness (2)

iPS BETTER THAN GENE THERAPY..(3)
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JSC16
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Fairly standard paper
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eliza154
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MATHS
34000 (can't remember what, kidney question maybe)
43.2% Hardy Weinberg (but I have heard 18?)
1.934x10^25 cells in the tumour
1.963x10^-3 cubic centimetres per hour
296826 size of population using 2000e^5
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pploveash
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(Original post by eliza154)
MATHS
34000 (can't remember what)
43.2% Hardy Weinberg (but I have heard 18?)
1.934x10^25 cells in the tumour
1.963x10^-3 cubic centimetres per hour
296826 size of population using 20000e^5
Yeah i got 18%
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JSC16
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Why did bubbly move to the right? CO2 produced from some aerobic respiration
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Chemnbio
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Didn’t like this paper especially the lactose question
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Xusor1
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(Original post by JSC16)
Why did bubbly move to the right? CO2 produced from some aerobic respiration
I put that CO2 increased pressure on the left of the liquid so It pushed it to the right .
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eliza154
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(Original post by JSC16)
Why did bubbly move to the right? CO2 produced from some aerobic respiration
would it be anaerobic, because the alkaline stuff absorbed the oxygen?
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JSC16
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If anaerobic does not produce any gases how could the bubble possibly move to the right
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luce12341
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(Original post by eliza154)
MATHS
34000 (can't remember what)
43.2% Hardy Weinberg (but I have heard 18?)
1.934x10^25 cells in the tumour
1.963x10^-3 cubic centimetres per hour
296826 size of population using 20000e^5
Yeh I got 34000 for the kidney rate one too
Got 18 for hardy Weinberg
Same for the population
Can’t remeber th other two
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JSC16
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(Original post by lucyv1234)
Yeh I got 34000 for the kidney rate one too
Got 18 for hardy Weinberg
Same for the population
Can’t remeber th other two
The population of the bacteria started at 2000 not 20000
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eliza154
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(Original post by JSC16)
If anaerobic does not produce any gases how could the bubble possibly move to the right
was it yeast doing the respiration? (can't remember) if so, then carbon dioxide would be produced
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dannypaterson8
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(Original post by JSC16)
If anaerobic does not produce any gases how could the bubble possibly move to the right
Anaerobic respiration in yeast produces CO2 molecules that increase the pressure moving the bubble to the right
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eliza154
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(Original post by JSC16)
The population of the bacteria started at 2000 not 20000
thanks I'll fix that
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Chemnbio
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How chloride ion prevent the nerve impulse from carrying on in the post synaptic neurone (3marks)

Causes hyperpolisaton so depolaristion doesn’t occour and therefore action potentials don’t pass on
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JSC16
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Yes it was in a glucose culture, glycolysis would only take place if anaerobic respiration happened and no gas would be produced
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luce12341
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For the yeast one where it said why do you wait an hour I said so the gas fills up the flask and gets to the tubing

There was a question about why they all had to be on the same diets and for that one I said so they had the same amount of glucose in the blood and water potential of the blood was constant so no osmoregulation would occur
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JSC16
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(Original post by Chemnbio)
How chloride ion prevent the nerve impulse from carrying on in the post synaptic neurone (3marks)

Causes hyperpolisaton so depolaristion doesn’t occour and therefore action potentials don’t pass on
The charges of Na2+ and Cl- cancel so neurone less depolarised so threshold not met leading to no action potential
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tahmid78
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(Original post by lucyv1234)
For the yeast one where it said why do you wait an hour I said so the gas fills up the flask and gets to the tubing
Allows rate of respiration to stabalize
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luce12341
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(Original post by tahmid78)
Allows rate of respiration to stabalize
Oh yeh I think these types of question usually have multiple answers anyways
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