OCR Biology F212 (Molecules, Biodiversity, Food and Health)- 21st May 2012

Oh sorry my bad!
Describe the chemical test for finding the presence of a reducing sugar (5)

add benedicts solution gives brick red
calorimeter to measure absorbance
Same volume of sugar and solution
Plot a graph
Copper (2) sulphate
and starts from yellow

Reply 181

The Illuminati

4

Original post by Joshalos

Time to finally join in the F212 thread! I'm willing to help others with any questions they may have but could others also ask me a few questions, too?

Explain why glycogen makes a good storage molecule.

Reply 182

otrivine

14

Original post by The Illuminati

Explain why glycogen makes a good storage molecule.

- compact
-insoluble in water
- ends can be broken down rapidly to release energy for aerobic respiration

Reply 183

AmyLH

10

Thought I'd join the thread. It's the exam I'm most worried about tbf. :redface:

Reply 184

Harriet : )

10

Original post by otrivine

add benedicts solution gives brick red
calorimeter to measure absorbance
Same volume of sugar and solution
Plot a graph
Copper (2) sulphate
and starts from yellow

Yup! Got it :smile:

Reply 185

Rainingshame

13

Original post by LETSJaM

I hate biodiversity!

We've just finised our syllabus a week ago. :redface:

Does anyone know the last time a big biodiversity question came up???

<3 x

i don't think there has been one, though there are always 2 10-15 markers

Reply 186

username854791

OP

14

Guys your worst topic?

Mine: Biodiversity, Conservation, Food and stuff.

Reply 187

Joshalos

15

Original post by The Illuminati

Explain why glycogen makes a good storage molecule.

Glycogen is a good storage molecule but it is a non-polar molecule and so is insoluble in water. This means that it won't affect the water potential of cells and cause them to swell and burst.
It is also folded into a highly compact shape which means you can fit many glycogen molecules in a small space.
The bonds also contain lots of energy and the highly branched structure means that chains can be broken down very quickly from simultaneous branching points at once.

Reply 188

RandomPeopleDancin

2

Quiz time!
What is a dichotomous key and what feature does a good key have? (Think about the questions on the key is a hint)

Reply 189

otrivine

14

Original post by RandomPeopleDancin

Quiz time!
What is a dichotomous key and what feature does a good key have? (Think about the questions on the key is a hint)

- This is a key where there are 2 alternative answers to be able to identify the specimen.
- A question fewer than the number of species found

Reply 190

AishaTara

14

hope the A in around 66 like last year :tongue:

Reply 191

Sharyn

Original post by has87

I know

also sampling techniques etc. OCR are a really mean board when it comes to boring topics -_- :mad:

Yeah all the big marks are for the boring topics and I really need a solid A in this paper because I got a B for F211 and the retake today didn't go amazingly well :frown:

Anyways good luck with revision I'm going to go attempt some conservation now...

Reply 192

ohmyBEAUT

2

Really need to do well in this paper so I can make up for doing badly in my F211 exam today.

Reply 193

fionywy

GUYS!!!
time to focus on unit 2 exam!!!
especially to those who had their unit 1 just now!!
forget it and get on!
i know i did badly in the exam but anyways....forget it LOL

Reply 194

The Illuminati

4

Original post by otrivine

- compact
-insoluble in water
- ends can be broken down rapidly to release energy for aerobic respiration

Yep

Original post by Joshalos

Glycogen is a good storage molecule but it is a non-polar molecule and so is insoluble in water. This means that it won't affect the water potential of cells and cause them to swell and burst.
It is also folded into a highly compact shape which means you can fit many glycogen molecules in a small space.
The bonds also contain lots of energy and the highly branched structure means that chains can be broken down very quickly from simultaneous branching points at once.