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AS Biology Revision OCR

Here we can all help eachother and discuss any problems/questions (relating to biology obviously :P)
I find Unit 2 papers so much for difficult than Unit 1 :/

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Reply 1

Lifeimitatesart

Haven't started the unit 2 papers yet :/

Reply 2

FemaleBo55

Original post by Lifeimitatesart

Haven't started the unit 2 papers yet :/

I started them today but i felt like I didnt know the content as I had expected. What I noticed was that unit 2 papers require more application of theories to certain situation

Reply 3

coolgamer

I have a question. Unit 2 how many ester bonds in phospholipid

Reply 4

coolgamer

I am just rewriting notes and recapping and memorising

Reply 5

Munrot07

Original post by coolgamer

I have a question. Unit 2 how many ester bonds in phospholipid

Reply 6

coolgamer

Original post by Munrot07

So in a condensation reaction 3 water molecules will be produced

Reply 7

coolgamer

So what is the similarities and difference between triglycerides and phospholipids?

Reply 8

Munrot07

Original post by coolgamer

So in a condensation reaction 3 water molecules will be produced

Yep

Reply 9

Munrot07

Original post by coolgamer

So what is the similarities and difference between triglycerides and phospholipids?

Similarities - 3 ester bonds, glycerol, 2 fatty acid chains.
Differences - 3rd fatty acid chain on phopspholipid is replaced by a phosphate group, phospholipid is polar a triglyceride is not.

Reply 10

randoms132

Triglycerides have 3 fatty acids and a glycerol molecule

Phospholipids have 2 fatty acids and instead of 3 fatty acids one of them is a phospahte group
A phospholipid is polar meaning it has two different 'poles' ; the hydrophilic head (water loving) and the hydrophobic tail (water hating)

Reply 11

randoms132

Ive been doing quite alot of past papers and ive been getting grades i dont want :frown:

( and ive attempted some unit 2 but theyre so hard
anyone got any tips for unit 2

Doing the 'Application' and 'How Science Works' parts in the as aqa bio NT book is worth everything they reallt do help :P

Reply 12

coolgamer

Original post by Munrot07

Similarities - 3 ester bonds, glycerol, 2 fatty acid chains.
Differences - 3rd fatty acid chain on phopspholipid is replaced by a phosphate group, phospholipid is polar a triglyceride is not.

Reply 13

coolgamer

Original post by randoms132

Ive been doing quite alot of past papers and ive been getting grades i dont want :frown:

Have you revised everything before u did the paper?
Make sure u know key definitions?
Know the meanings of explain describe state .... You can easily lose marks if u don't read and also look at the no of mArks if it's 2 then they expect 2 points