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Edexcel 6BIO1 ~ 9th January 2013 ~ AS Biology

Once again, how does the primary structure of an enzyme determine its function?

The primary structure is the sequence of amino acids.
The type of amino acids present determines the type of bonds whereas the position determines the specific active site of the enzyme. An enzyme contains small amino acids.

Reply 581

gimme those exams

Original post by Rubyturner94

germ line therapy involves altering the alleles in the sex cell, so the offspring will be effected by the therapy. this can give rise to ethical issues because it can lead to choosing other charascteristics auch as gender, eye colour. whereas somatic therapy involves altering the cells in the body that are most effected by the disorder, and has no effects on sex cells. is this right? have i missed anything?

Posted from TSR Mobile

On the Question, following the markscheme, I think you would get 0 such as I did.

Points to mention:
1.Idea of germ line gene therapy affecting every cell in the body; - Here you might get the mark for mentioning altering of sex cells ...Idk
2.Germ line therapy can pass genes on to next generation/ eq;
3.Future generations unable to give consent;
4. May result in designer babies / can cause new mutations

Reply 582

vladipn

i found some conflicting data between books e.g. Ann Fullick's textbook says that ionic interactions (in proteins) are strong whereas in CGP it clearly states that they are weak. And this is just an example (also at atherosclerosis, etc) Which one should i trust?

Reply 583

NilFBosh

3

Another doubt

When two molecules are given and when they ask to draw the product, in the answer space, should we draw only the products or should we draw the full equation?

Reply 584

vladipn

Original post by NilFBosh

Another doubt

When two molecules are given and when they ask to draw the product, in the answer space, should we draw only the products or should we draw the full equation?

the full equation i guess as you have to show how water is formed from the two molecules in the condensation reaction

Reply 585

raflook

Anyone know where I can find the snab june 2012 unit 1 past paper?

Reply 586

letsbehonest

15

Original post by vladipn

i found some conflicting data between books e.g. Ann Fullick's textbook says that ionic interactions (in proteins) are strong whereas in CGP it clearly states that they are weak. And this is just an example (also at atherosclerosis, etc) Which one should i trust?

The snab book doesn't really mention them being weak/strong so it should matter too much but I think

'weak Ionic bonds between Ionised r groups' is correct.

Reply 587

bubblegummer

what is correlation and causation? i always thought they were the same like when a variable changes it will affect the other variable. can someone pls explain them to me? :s-smilie:

Reply 588

gimme those exams

Original post by bubblegummer

what is correlation and causation? i always thought they were the same like when a variable changes it will affect the other variable. can someone pls explain them to me? :s-smilie:

A correlation is that a change in one variable is reflected in the change of another variable. A causation is when the change of one variable causes the change of another variable

Reply 589

gimme those exams

Original post by NilFBosh

Another doubt

When two molecules are given and when they ask to draw the product, in the answer space, should we draw only the products or should we draw the full equation?

pretty sure you don't have to. You have to draw the new products and draw water as H20 given off( and say water is given off)

Reply 590

Zarah01

9

exam_question_analysis_updated.xlsx
so we made this at school today to help predict what will be in our exam

Reply 591

username893771

13

Original post by bubblegummer

what is correlation and causation? i always thought they were the same like when a variable changes it will affect the other variable. can someone pls explain them to me? :s-smilie:

Correlation: A change in one variable is reflected by a change in another variable. Eg. Where there is an increase in smokers, an increase in lung cancer will be observed.

Causation: A change in one variable is caused by a change in another variable. Eg. An increase in exercise will cause an increase in heart rate.

Correlation doesn't necessarily mean causation. So whereas there is a link between smoking and lung cancer. You can't simply say smoking causes lung cancer because not everyone that smokes gets lung cancer as a result. However, if you exercise your heart rate will increase as a result.

Reply 592

vladipn

so two quick things:
the atheroma is the cholesterol deposit that builds up BEFORE or AFTER it is hardened by fibrous tissue and Ca ions?

plant statins are the normal type of statins or sterols and stenols (CGP says they are sterols&stenols and i think i found it in a past paper as well, but in 2012 past paper if i'm not mistaken, they take it as normal statins (for risk faactors) )
Thanks :smile:

(edited 11 years ago)

Reply 593

SarahLeanne

6

Does anybody know if I got this answer correct for one of the questions of the may 2012 paper?

There was a photo and the question was 'calculate the increase in the thickness of artery wall where the plaque is located.'

I checked the mark scheme and the original value was 0.8 cm where there was no plaque and the thickness of the wall where the plaque was, was 2.5 cm, which I got right. It then says for the third mark, 'correct calculation.' Were they too lazy to right the actual answer? :frown:

IDK hahaha.

Anyway, I did this sum 2.5-0.8=1.7

(1.7/0.8) * 100 = 212.5% increase

Was 212.5% the right answer? I'd be very very grateful if someone could help me out :biggrin:

PS. GOOD LUCK GUYS! I'm gutted I only saw this thread a day before the exam. I have chemistry and maths exams in the next week aswell :frown:

lol

Reply 594

gimme those exams

How is the structure of the artery related to its function? For a 3 marker what would you include... I always forget these

(edited 11 years ago)

Reply 595

gimme those exams

Original post by SarahLeanne

Does anybody know if I got this answer correct for one of the questions of the may 2012 paper?

There was a photo and the question was 'calculate the increase in the thickness of artery wall where the plaque is located.'

I checked the mark scheme and the original value was 0.8 cm where there was no plaque and the thickness of the wall where the plaque was, was 2.5 cm, which I got right. It then says for the third mark, 'correct calculation.' Were they too lazy to right the actual answer? :frown:

IDK hahaha.

Anyway, I did this sum 2.5-0.8=1.7

(1.7/0.8) * 100 = 212.5% increase

Was 212.5% the right answer? I'd be very very grateful if someone could help me out :biggrin:

PS. GOOD LUCK GUYS! I'm gutted I only saw this thread a day before the exam. I have chemistry and maths exams in the next week aswell :frown:

lol

I think it was 17cm. It doesnt tell you to calculate the percentage increase!

Reply 596

SarahLeanne

6

Original post by gimme those exams

I think it was 17cm. It doesnt tell you to calculate the percentage increase!

Ahhh! Thank you!! :smile:

Do you think I would have gotten the mark anyway? Because I got 1.7 cm written down which was the answer. I'm so stupid! Making things a lot harder for myself! Hahaha : :rolleyes:

xx

Reply 597

username893771

13

Original post by gimme those exams

How is the structure of the artery related to its function? For a 3 marker what would you include... I always forget these

Narrow lumen - to keep blood under high pressure
Smooth muscle - Reduce friction, allows the artery to dilate and constrict
Elastic fibres - Allow recoil to prevent damage

I feel as if I'm forgetting something though.

Reply 598

Branny101

Endothelial lining? For blood flow?

Posted from TSR Mobile

Reply 599

mynameisntbobk

18

Original post by gimme those exams

How is the structure of the artery related to its function? For a 3 marker what would you include... I always forget these

Smooth endothelium, less friction.

Thick muscle and elastic fibre
Elastic fibres, stretch and recoil, maintains high blood pressure. Also pushes blood along the artery if it recoils and stretches behind the blood.
Muscle, allows artery to constrict and dialate.

Narrow lumen, allows blood to travel under high pressure

(edited 11 years ago)

Edexcel 6BIO1 ~ 9th January 2013 ~ AS Biology

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