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Biology Paper 1

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[Spy]:
Hey Guys

So last paper in Bio AS, paper 2 was dam easy and so was paper 3, so i think the paper is going to be a killer :/

plus look at physics paper 1 was relatively very hard, so yeah god be with us, but since physics was full of repeated questions then so should bio so focus on past papers :)


any questions lets post them here :) and anyone predicting anything share it with us

good luck all :D

ill start with the questions myself, in one of the papers it asked

What level of organization is Responsible For the globular shape of enzymes?

- Primary
- Secondary
- Tertiary
- Quaternary

it should be quaternary but its tertiary how :S

XaM!!:
its tertiary...
primary refers to sequence to amino acids.
secondary refers twisting of chains into alpha helix n b-pleated
tertiary refrs to bending of chains to form GLOBULAR or fibrous proteins... n lastly
quaterny refers to prosthetic group(like sulphur proteins or iron in haemoglobin)

Gaz:
Correction: quaternary does not necessarily have to have a prosthetic group. quaternary structure is the arrangement of multiple folded protein or coiling protein molecules in a multi-subunit complex, i.e: more than one polypeptide chains. eg: myoglobin has one folded chain hence it has a tertiary structure. haemoglobin has 4 chains, hence a quaternary str.

XaM!!:
Quaternary always have a prosthetic group. like myoglobin n haemoglobin have iron as prosthetic group.

[Spy]:
no in my book it specifically says quaternary is for globular. :S
well it doesnt specicially say that but globular proteins part is under quaternary organization, but thanks :D

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