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Monster94
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#1121
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#1121
(Original post by posting)
can some1 link me the unofficial mark scheme please
It's on the previous page.
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MattSimcock
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#1122
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#1122
For Hardy-Weinberg I forgot it was 2pq and just worked it out using pq, so I got 3.06% instead of 6.12%. Obviously everything else was right. Will I get 1/3 or 2/3?
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<3xo
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#1123
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#1123
what were the answers the questions comparing the organisms with malaria using the table?
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lala12
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#1124
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#1124
(Original post by Monster94)
What was the answer to the P <0.01 question?
there is less than 0.01 probability that the correlation (between whatever was mentioned) occurred due to chance.
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temi1234
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#1125
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#1125
(Original post by TheFootyKing19)
Answers from top of my head:

Pioneer species: - Ulva Lactuna (whatever it was)

Blocks: - blocks may prevent growth of algae? (Not sure)

Describe and explain succession:
- pioneers species change environment
- allows other species to colonise
- other species outcompete existing ones
- environment less hostile
- then just talk about what's happening in graph between different types of algae

Define phenotype: (this is what's in the spec)
- expression of the genetic constitution
- and it's interaction with the environment

Tach-says caused by recessive allele: (can't remember what the actual numbers were on pedigree diagram)
- offspring has condition
- parents don't so must be carriers/heterozygous

Hardy Weinberg calc:
- 6%
- but I'm sure you can get 1/2 marks for identifying q^2 and working out 2pq?

Why the number of heterozygotes may be different?
- random fusion of gametes
The question mentioned that due to the Tach-says genetic disease, most individuals with the disease do not survive after childhood; therefore don't reach the age to reproduce and pass on the allele, hence overtime this decreases the % of heterozygote alleles overall.

Tick box for respiration: (Y represents Yes)
- occurs in mitochondria X Y Y
- co2 produced X Y Y
- reduced NAD Y Y Y

Why glucose not used as respiratory substrate:
- glucose broken down into pyruvate
- glycolysis only occurs in the cytoplasm

How does methanfate (whatever it was) inhibit reaction:
- competitive inhibition/ binds to active site of enzyme
- preventing an enzyme substrate complex to form

Why oxygen concentration decrease:
- oxygen is a terminal electron acceptor
- oxygen combines with protons and electrons to form a molecule of water

In dark:
- so no photosynthesis can take place

I ron deficiency - TP:
- less GP produced
- less TP produced
- less electrons excited in chlorophyll
- less ATP produced
Etc (??? No idea??)^

Take lizards from many sites, why:
- so that investigation is 'representative of the whole sample'

Random:
- uses a random number generator (calculator)
- produce numbers to use as co-ordinates on a grid

% used:
- allow a comparison to be made
- as into atlas starting numbers were different

- questions on interpreting etc...

Speciation: (in a nut shell)
- populations become isolated
- 2 populations separate thus no interbreeding between them
- variation
- such as mutations exist
- advantageous allele
- successfully reproduce
- leads to a change in allele frequency

Increase in nitrates in river: (in a nut shell)
- eutrophication occurs
- algal bloom occurs
- dense later of algae, absorb light
- increased competition of algae, death too
- decomposed by saprobionts whose populations increase
- increased aerobic respiration by the above ^ uses up oxygen
- water becomes depleted, hence fish die

Integrated Pest Management: (this question did not ask advantages of bio control and pesticides):
- reduces amount of pesticides that need to be sprayed
- minimizes risk to both humans and environment
- reduces risk of pests developing resistance
- increase crop productivity
- limits economic damage to agricultural system
- cheap to use - requires one application

Intensive rearing of domestic live feedstock to increase net productivity:
- kept inside so loss energy lost as heat
- controlled diet and fed on high proportion of carbohydrates so less is in farces
- restricted movement so less energy wasted in movement
- genetically selected for high productivity
- antibiotics added to reduce any risk of disease
I'm glad to see this, but check the correction to that one question, everyone in my college talked about that.
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Monster94
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#1126
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#1126
(Original post by lala12)
there is less than 0.01 probability that the correlation (between whatever was mentioned) occurred due to chance.
thanks!! :d
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Chicken Bacon
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#1127
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#1127
(Original post by sophie15)
What did people get for the tick questions on respiration?
not quiet sure, but i think i didnt tick anything in the first row. ? or maybe only ticked the last box of the first row. Can't remember the headings
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Wick3d
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#1128
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#1128
The grade boundaries for an A for the last 5 Bio4 papers:

52 - January 2013
50 - June 2012
50 - January 2012
53 - June 2011
47 - January 2011

The highest raw mark needed for an A was 53, I am expecting about 55 for an A this time.
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temi1234
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#1129
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#1129
(Original post by sophie15)
What did people get for the tick questions on respiration?
I can't remember the titles and details, but i remember the order i placed them;

- - [tick]
- [tick][tick]
[tick][tick][tick]
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TheFootyKing19
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#1130
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#1130
(Original post by iAre Teh Lejend)
not quiet sure, but i think i didnt tick anything in the first row. ? or maybe only ticked the last box of the first row. Can't remember the headings
Here:

Tick box for respiration: (Y represents Yes)
- occurs in mitochondria X Y Y
- co2 produced X Y Y
- reduced NAD Y Y Y
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Chicken Bacon
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#1131
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#1131
(Original post by temi1234)
I'm glad to see this, but check the correction to that one question, everyone in my college talked about that.
I wrote the exact same thing. Literally, word for word.

The red text that is. :P
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sophie15
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#1132
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#1132
The tick q was

Glycolysis. Link Reaction. . Krebs Cycle
Found in.
Mitochondria

Produces
CO2

Reduces
NAD
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elja1905
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#1133
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#1133
I dont think we have much to worry about with the grade boundaries. People are on about them being in the 60's, but ive just checked every grade boundary from Jan 2013 to Jan 2010 and an A* has never been higher than 57/75, its lowest being 39/75. Here are the boundaries:

Jan 2010: A 41 B 37 C 33 D 29 E 26
Jun 2010: A* 39 A 35 B 31 C 27 D 23 E 19
Jan 2011: A* 52 A 47 B 42 C 38 D 34 E 30
Jun 2011: A* 57 A 53 B 49 C 45 D 41 E 37
Jan 2012: A* 54 A 50 B 46 C 42 D 38 E 34
Jun 2012: A* 54 A 50 B 46 C 42 D 38 E 35
Jan 2013: A* 57 A 52 B 47 C 43 D 39 E 35
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TheFootyKing19
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#1134
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#1134
(Original post by temi1234)
I can't remember the titles and details, but i remember the order i placed them;

- - [tick]
- [tick][tick]
[tick][tick][tick]
Link reaction AND Krebs cycle occur in MITOCHONDRIA! Your first row should be:
- Tick Tick
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temi1234
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#1135
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#1135
(Original post by Wick3d)
The grade boundaries for an A for the last 5 Bio4 papers:

52 - January 2013
50 - June 2012
50 - January 2012
53 - June 2011
47 - January 2011

The highest raw mark needed for an A was 53, I am expecting about 55 for an A this time.
So your expecting the grade boundary to be high on this one, does it seem easier than previous papers?
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Wick3d
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#1136
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#1136
(Original post by temi1234)
I can't remember the titles and details, but i remember the order i placed them;

- - [tick]
- [tick][tick]
[tick][tick][tick]
Shouldn't it be:

- [tick] [tick]
- [tick] [tick]
[tick] [tick] [tick]

As the link reaction does take place in the mitochondria.
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temi1234
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#1137
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#1137
(Original post by lizjames94)
I dont think we have much to worry about with the grade boundaries. People are on about them being in the 60's, but ive just checked every grade boundary from Jan 2013 to Jan 2010 and an A* has never been higher than 57/75, its lowest being 39/75. Here are the boundaries:

Jan 2010: A 41 B 37 C 33 D 29 E 26
Jun 2010: A* 39 A 35 B 31 C 27 D 23 E 19
Jan 2011: A* 52 A 47 B 42 C 38 D 34 E 30
Jun 2011: A* 57 A 53 B 49 C 45 D 41 E 37
Jan 2012: A* 54 A 50 B 46 C 42 D 38 E 34
Jun 2012: A* 54 A 50 B 46 C 42 D 38 E 35
Jan 2013: A* 57 A 52 B 47 C 43 D 39 E 35
I disliked your comment by accident how do i undo the dislike??
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Gcayte
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#1138
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#1138
What was the answer to the lizard question with it referring to white and red blood cells?
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elja1905
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#1139
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#1139
(Original post by temi1234)
I disliked your comment by accident how do i undo the dislike??
LMAOO dont worry, try liking it to counteract the dislike?
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temi1234
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#1140
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#1140
(Original post by Wick3d)
Shouldn't it be:

- [tick] [tick]
- [tick] [tick]
[tick] [tick] [tick]

As the link reaction does take place in the mitochondria.
:eek: completely forgot, 1 mark gone
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