A2 Biology OCR June 2015 Revision Thread

did anyone else write chloroplast envelope rather than inner membrane

I did, hopefully its one of those that will be accepted

IT WAS MSM WOOOOO!!! it was MSM trust me cause i asked my sister who got A* in bio and is doing dentistry

Surely it was outer membrane for q1?

I'm just putting the things I worded differently in bold

Guys pls add anything you remember

1) Inner membrane
Stroma
Granum

M
B (this one is so iffy ;_; - I thought it was B but then I realised motor neurones attach to the CNS by its dendrons, so changed it to S?)
M

why less ATP generated than theoretical
ATP used to actively transport pyrivate from glycolysis to Link reaction
ATP used to actively transport NADH2 from cytoplasm into matrix
Some protons leak through mitchondrial matrix reducing proton motive force (I said proton gradient)

how structure of motor n sensory neurone are similar
Both have cell body with nucleus and mitchondria
Both have axon
Both can be myelinated, schwann cells wrapped around
- (I said that they both also have dendrites)

Anaerobic respiration (Wasn't the question why less ATP is formed in Anaerobic than Aerobic?)
No oxygen- oxygen is final electron acceptor
Electron transport chain cannot function,
so link reaction and krebs cycle also stop
Glycolysis is the only source of ATP
- (NADH and FADH produced in Link & Krebs etc are used in oxidative phosphorylation - H+ used to make more ATP, while H+ from NADH made in glycolysis doesn't produce more ATP in anaerobic)
- (Comparative figures might be a mark? 2ATP made in anaerobic respiration, 36 in aerobic? Bulk of ATP produced in oxidative phosphorylation/chemiosmosis?)

Secretion of Insulin
1) Glucose diffuses in, metabolised to ATP
2) ATP causes potassium ion channels to close, depolarisation (K+ accumulated in cell, I put changes the potential difference, idk)
3) Voltage-gated calcium channels open, calcium ions diffuse in
4) Ca2+ causes vesicles containing insulin to fuse with cell surface membrane and release (secrete) insulin via exocytosis

What cells make red blood cell and the location
Stem cells
Bone marrow

RRT
93


Range? I said error bars.
how peritonal dialyisis differs from haemodalyisis? (LOOOL GOT THIS WRONG)
peritoneal needing to be done 4 times a day? Counter-current multiplier effect of the blood and dialysis fluid makes diffusion more effective in the Haemodialysis, peritoneal doesn't have this? There's the amount of blood too that it's exposed to as well...)
Shivering in fever? (bahaha i don't even know what I wrote there awkz)

That doesn't mean anything

IT WAS MSM WOOOOO!!! it was MSM trust me cause i asked my sister who got A* in bio and is doing dentistry

i'll set up a google docs thing everyone can edit?

I did, hopefully its one of those that will be accepted

Surely motor neurone dendrites are connected by synapses though? How else would it communicate with the cns

IT WAS MSM WOOOOO!!! it was MSM trust me cause i asked my sister who got A* in bio and is doing dentistry

I think k was box plot. I got it just at the last minute.

Surely motor neurone dendrites are connected by synapses though? How else would it communicate with the cns

Whats your google name this isn't working...