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Tikara
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#501
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#501
(Original post by Starlight94)
Can someone post the Jan13 QP and MS please?
here ya go mate

Okay everyone we're in the last stretch!! make sure you know your stuff inside and out so simple knowledge questions don't lose you marks

Question 7 is always the strange HSW killer and make sure to always make your answers in relation to the question, so state a biology principle needed to be learnt and then conclude in relation to words and concepts stated in the question!

I'm gonna post up a few generic answers in a sec if that'll help anyone!!
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flyylikejetz
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#502
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#502
Question 7 hsw tips ?
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Qwob
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#503
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Why is everyone talking about respiration here? Respiration is a unit 5 topic isn't it? Unit 4 is only photosynthesis...
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wandi
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#504
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#504
(Original post by Qwob)
Why is everyone talking about respiration here? Respiration is a unit 5 topic isn't it? Unit 4 is only photosynthesis...
Nope, respiration's a unit 4 topic
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TH4RG3
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#505
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#505
(Original post by Qwob)
Why is everyone talking about respiration here? Respiration is a unit 5 topic isn't it? Unit 4 is only photosynthesis...
Lol someones not been revising

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opengeek
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#506
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#506
does anyone else here think unit 5 is easier than unit 4 ?
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Starlight94
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#507
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#507
(Original post by Tikara)
here ya go mate

Okay everyone we're in the last stretch!! make sure you know your stuff inside and out so simple knowledge questions don't lose you marks

Question 7 is always the strange HSW killer and make sure to always make your answers in relation to the question, so state a biology principle needed to be learnt and then conclude in relation to words and concepts stated in the question!

I'm gonna post up a few generic answers in a sec if that'll help anyone!!
Thanks so much!! That'd be great
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Tikara
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#508
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#508
Some generic recurring answers :

Why are offspring not in the same ratio as the cross?
-Fusion of gametes is random
-Gametes may not be in equal numbers
-May be small sample <--- depends on question!

Use terms probability and chance in your answer
-There is a ___% probability that the difference in results is due to chance
(usually 5%)

Null Hypothesis
-There is no correlation between _______ and ______

Why was the _____ done at random?
-Avoid bias
-Allows use of statistical test
-So data is representative

Why is ATP awesome?
-Released in manageable amounts
-Hydrolysis is one reaction
-Is unstable so an immediate energy source
-Phosphorylates
-Makes subsance more reactive/lowers activation energy
-Can be reformed/made again

What does hardy weinberg predict?
-Proportion of dominant to recessive alleles will stay the same from generation to generation

What does hardy weinberg assume?
-No mutations
-Population is isolated
-No selection pressure
-Large Population
-Random mating

Tip:
Assume the examiner is a moron!! usually you have to say things that seem obvious to get the marks!
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#509
(Original post by Qwob)
Why is everyone talking about respiration here? Respiration is a unit 5 topic isn't it? Unit 4 is only photosynthesis...
Glycolysis, Link reaction, Krebs cycle, Electron Transport chain.

Do those words ring a bell?

EDIT: Just to clarify this is AQA!
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Tikara
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(Original post by frogs r everywhere)
Glycolysis, Link reaction, Krebs cycle, Electron Transport chain.

Do those words ring a bell?
yeah, respiration is most definitely unit 4 (section 4)
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Tikara
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#511
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#511
Equations!!!

Hardy Weinberg Principle

p + q = 1

p = frequency of dominant allele
q = frequency of recessive allele


p^2 + q^2 + 2pq = 1

p^2 = frequency of homozygous dominant genotype
q^2 = frequency of homozygous recessive genotype
2pq = frequency of heterozygous genotype


~(Make sure if anything is in a percentage convert to a frequency and vice versa! so 20% is 0.2 and 0.34 is 34%)

Percentage Efficiency of Energy Transfer

(Energy available after transfer / Energy available before transfer ) * 100

Productivity

Net primary productivity = Gross productity - Respiratory losses

Estimated Mean Density (Quadrats)

(Total number of individuals counted) / number of quadrats used) * (area of each quadrat)

Estimated Total Population (Mark Release Recapture)

(Number caped/marked in first sample) * (number captured in second sample) / (number marked in second sample)

Birth Rate

(Number of births per year / Total population of same year) * 1000

Death Rate

(Number of deaths per year / Total population of same year) * 1000

Population Growth:

(Births + immigration) - (Deaths + emigration)

Percentage Population Growth Rate

(population change during specified period / population at start of specified period) * 100
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(Original post by Tikara)

Why is ATP awesome?
-Released in manageable amounts
-Hydrolysis is one reaction
-Is unstable so an immediate energy source

Tip:
Assume the examiner is a moron!! usually you have to say things that seem obvious to get the marks!
That paragraph had me to bits :rofl:

For ATP, you could also say:

Phosphorylates
Makes subsance more reactive/lowers activation energy
Can be reformed/made again
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Wick3d
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#513
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(Original post by frogs r everywhere)
That paragraph had me to bits :rofl:

For ATP, you could also say:

Phosphorylates
Makes subsance more reactive/lowers activation energy
Can be reformed/made again
I always get caught out by questions like that, I assume they can't simply what the easy answers there must be a super difficult one. But NO! They want 3 simple points listed and straight to the point. I always fall for it as well...
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Tikara
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#514
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#514
(Original post by frogs r everywhere)
That paragraph had me to bits :rofl:

For ATP, you could also say:

Phosphorylates
Makes subsance more reactive/lowers activation energy
Can be reformed/made again
hehehe its so frustrating though when the mark scheme says something thats proper obvious

thanks very much I knew the ATP bit could have a bit more on - I've just updated the post
I also put the hardy weinberg stuff and a list of all the equations

[if i've missed anything/ got anything wrong tell me !! then i'll update ]
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Tikara
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#515
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#515
(Original post by Wick3d)
I always get caught out by questions like that, I assume they can't simply what the easy answers there must be a super difficult one. But NO! They want 3 simple points listed and straight to the point. I always fall for it as well...
to save time and sanity I just bullet point stuff :P unless its question 8
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#516
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#516
(Original post by Wick3d)
I always get caught out by questions like that, I assume they can't simply what the easy answers there must be a super difficult one. But NO! They want 3 simple points listed and straight to the point. I always fall for it as well...
If its a 2 marker then, yes, you're right. BUT if its along the lines of "Explain why ATP is useful in biological processes" or suchlike, I think those previous points will get you some marks. :cool:


EDIT: Q8 a) Jan 12 paper!
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bellaanne
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#517
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Not sure if this is right or not: if the SD (standard deviation) does not overlap then the results are not due to chance and are significant. Please help! and is there anything else we need to know about SD?
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Scienceisgood
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#518
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#518
(Original post by bellaanne)
Not sure if this is right or not: if the SD (standard deviation) does not overlap then the results are not due to chance and are significant. Please help! and is there anything else we need to know about SD?
If it overlaps, are not significantly significant and thus have a 5% probability of being due to chance.
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#519
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(Original post by bellaanne)
Not sure if this is right or not: if the SD (standard deviation) does not overlap then the results are not due to chance and are significant. Please help! and is there anything else we need to know about SD?
If standard deviations overlap, then the data is due to chance. The results are NOT significant
If they do overlap, then the data is not due to chance. The results are significant.
(see above for the use of probabilities)

Reminds me of the empa.
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Tikara
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#520
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#520
okay guys I'm gonna go do a practice test- when I come back I'm gonna round up all the 5/6 marker questions and answers and post them here

they're usually either explain advantages and disadvantages of something - comparing two things (e.g. biological control and chemical) or just straighforward describing something in detail (honestly my fav question :P)
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