Amylose, Amylopectin, Starch, Glycogen and Cellulose!

This is all from memory, can you check if this correct and where I can improve. Please and thanks! :smile:

Amylose is alpha glucose, forming straight chains

Amylopectin is also alpha glucose, highly branched instead of forming chains; together they form Starch

Starch is a mixture of Amylose and Amylopectin, it's insoluble; and is used as the storage molecule for plants.

Glycogen is made up of alpha glucose, it's highly branched and has short chains, it's the storage molecule for animals.

Cellulose is made up of beta glucose, linear molecule forming plant cell walls; it has other structural properties

Reply 1

Amber May

very good, but you could also put more about how the glucose bonds together (1,4 glycosidic bonds) :smile:

Reply 2

R1C3W1N3

Original post by Amber May

very good, but you could also put more about how the glucose bonds together (1,4 glycosidic bonds) :smile:

Okay thanks :smile:

, you also sitting F212?

Reply 3

Amber May

Original post by R1C3W1N3

Okay thanks :smile:

, you also sitting F212?

Yeah ,OCR

Reply 4

R1C3W1N3

Original post by Amber May

Yeah ,OCR

Yeah, we have exactly one month!
Do you know of any revision sites, or threads on tsr
How's your revision going?

Reply 5

Amber May

Original post by R1C3W1N3

Yeah, we have exactly one month!
Do you know of any revision sites, or threads on tsr
How's your revision going?

one month, wow that's scary!! Revisions going ok, but i'm really focusing on maths at the moment as its in one week. S-cool.co.uk has some good stuff and so does biologyguide.net, how about you, hows revision going? :smile:

Reply 6

R1C3W1N3

Original post by Amber May

Study leave from this friday, so hopefully I can re-revise thoroughly. Thanks :smile:

I'll try those sites out

Just gone through all the carbs on molecules that stuffs okay, we just finished biodiversity and health and I have to go through that (again) now, think I'm "on-track" might try a past paper tomorrow

I'm on tsr for revision so gimme a shout if you wanna revise or need help

Reply 7

Amber May

Original post by R1C3W1N3

Study leave from this friday, so hopefully I can re-revise thoroughly. Thanks :smile:

hi did a mock today it went ok but one of the questions was: Why is a dichotomous key called a dichotomous key? and i have no idea, help! feel free to ask anything as well :smile:

Reply 8

tssf_skye

Original post by Amber May

hi did a mock today it went ok but one of the questions was: Why is a dichotomous key called a dichotomous key? and i have no idea, help! feel free to ask anything as well :smile:

Hey! I had that mock too :smile:

It's because there are two answer available, hence dichotomous :smile:

Reply 9

R1C3W1N3

Original post by Amber May

hi did a mock today it went ok but one of the questions was: Why is a dichotomous key called a dichotomous key? and i have no idea, help! feel free to ask anything as well :smile:

Original post by tssf_skye

Hey! I had that mock too :smile:

It's because there are two answer available, hence dichotomous :smile:

Skye, thanks for the answer +1

Can you tell me which exam it was?
I'm on study leave now and will be revising biology, should I upload my notes?

Reply 10

tssf_skye

Original post by R1C3W1N3

Skye, thanks for the answer +1

Can you tell me which exam it was?
I'm on study leave now and will be revising biology, should I upload my notes?

It was the Jan 2013 paper :smile:

It was a nice paper actually, wasn't too tricky.
Yeah, upload your notes!

Reply 11

R1C3W1N3

Original post by tssf_skye

It was the Jan 2013 paper :smile:

It was a nice paper actually, wasn't too tricky.
Yeah, upload your notes!

All of my notes are hand written, only a few (start of biological molecules) are on the computer... I'll do the rest soon

Here you go :smile:

1 Biochemistry and metabolism.docx14.4KB

Different types of biological molecules.docx15.1KB

2.1.1.doc53.8KB

Carbohydrates overview.docx184.9KB

6 Amino acids - the monomers of proteins.docx74.1KB

5 Carbohydrates 3 structural units.docx142.6KB

4 Carbohydrates 2 energy storage.docx214.6KB

3 Carbohydrates 1 simple sugars.docx26.4KB

2 Biochemicals and bonds.docx15.4KB

Different types of bonding.docx15.5KB

Reply 12

R1C3W1N3

A few more..

F212 Notes.pdf220.0KB

Natural Selection & Biodiversity.docx20.5KB

Biologcal molecules Revision.docx83.4KB

Reply 13

Neon-Soldier32

As well as knowing their structure you need to know how this related to their function / how their structure is advantageous. For example, glycogen is highly branched giving it a large surface area on which it can be hydrolysed.

Reply 14

TomWas'Ere2015

Im sorry to say it, but thats really quite bad

Amylose is alpha glucose, forming straight chains - amylose is not glucose and vice versa

Amylopectin is also alpha glucose, highly branched instead of forming chains; together they form Starch - same thing.. a-glucose is a CONSTITUENT of amylopectin, plus here you have said that it doesnt form chains as it is branched. Sorry, but it forms branched CHAINS.

Glycogen is made up of alpha glucose, it's highly branched and has short chains, it's the storage molecule for animals see you said it yourself.. though, glycogen isnt the only storage molecule, so are fats and ATP