OCR Biology AS F211 May 2012

1)
Type of asexual reproduction. (1 mark)
Why is DNA replicated before division. (2 marks)
Define homologous pair of chromosomes (3 marks)
Location/function of squamous and ciliated epithelium in humans (4 marks)
Define a tissue (2 marks)

2)
State the name of 3 organelles (C,D,E or something). (3 marks)
Example of a type of extracellular protein in the vesicle (1 mark)
Active process involving exocytosis of a protein vesicle. (1 or 2 marks)
Outline the role of Golgi apparatus (2 marks)
2 organelles present that are not in prokaryotes (2 marks)
Organelle that would be present in prokaryotic cytoplasm (1 mark)

3)
What does amplitude represent? (1 mark)
What happens to elastic fibres between A-B. (1 mark)
What happens between B-C (3 + 1 marks)
Breathing rate (2 marks)
What causes residual volume of air in lungs (2 marks)
Tick type of circulatory system in humans/mammals (1 mark)

4)
Explain why haemolysis occurred and why plant cell didn't lyse (4 + 1 marks)
How to prevent RBC from bursting (1 mark).

5)
What does the fluctuation represent? (1 mark)
Describe the pressures compared to the cross-sectional areas using graph and diagrams (3 marks)
Explain why aorta curve fluctuates (2 marks)
Explain why pressure changes from aorta ------> veins (3 or 4 marks)
Explain why pressure decreases from arteries --> capillaries (2 marks)

6)
Most commonly transported sugar and tissue involved (2 marks)

Edit:
Mechanism for oxygen moving into RBC/haemoglobin (1 mark)
How are roots adapted for their function and mechanism (3 marks)

How are sugars actively loaded into phloem (3 marks)
Explain how temperature affects the drips per minutes/flow of sugar in phloem (3 marks).

There are obviously a couple more questions/marks somewhere along the lines, but those are the ones I can remember (and some stolen from AishaTara's list).

would i get a Max of 2 marks for outlying inspiration correctly?

love how I get no reps for my list, but you get two never mind how many marks equivalent left to figure out?
if anyone can get hold of the paper from school or get a teacher to go over it, please do and post the answers here. My french teacher went over the paper with us after the exam last year but sciences are like cba.

Wasn't too bad! Easier than Jan 12 but harder than May 11. Two minutes before entering the exam I looked up the definition for homologous chromosomes, but then completely forgot it.
A lot of people in my year put the first answer as meiosis, I was shocked!

Wasn't too bad! Easier than Jan 12 but harder than May 11. Two minutes before entering the exam I looked up the definition for homologous chromosomes, but then completely forgot it.
A lot of people in my year put the first answer as meiosis, I was shocked!

Sorry, I did reference you in it! I'll rep you, should make up for it.

ahh tbh most people remember anything if they quickly cram before going in. My teacher says if u always forget something go over it an hour before the exam, and as soon as you go inthe exam flick through to find a question related to it and do it first.
Woah really thats like gcse stuff as well :/ mitosis

Why is there residual volume still in the lungs? is it because never a steep enough gradient & dead space?

I wrote that a steep diffusion/conc gradient was formed. Air would move from the high concentration to low, this would be the outside environment to the lungs.
Some air would not move out because air won't go from a low concentration to high.
The conc gradient prevents the remaining air from moving out.

But apparently the answer is simpley because if some air was not in the lungs, the alveoli would collapse

I wrote that a steep diffusion/conc gradient was formed. Air would move from the high concentration to low, this would be the outside environment to the lungs.
Some air would not move out because air won't go from a low concentration to high.
The conc gradient prevents the remaining air from moving out.

But apparently the answer is simpley because if some air was not in the lungs, the alveoli would collapse

1)
Type of asexual reproduction. (1 mark)
Why is DNA replicated before division. (2 marks)
Define homologous pair of chromosomes (3 marks)
Location/function of squamous and ciliated epithelium in humans (4 marks)
Define a tissue (2 marks)

2)
State the name of 3 organelles (C,D,E or something). (3 marks)
Example of a type of extracellular protein in the vesicle (1 mark)
Active process involving exocytosis of a protein vesicle. (1 or 2 marks)
Outline the role of Golgi apparatus (2 marks)
2 organelles present that are not in prokaryotes (2 marks)
Organelle that would be present in prokaryotic cytoplasm (1 mark)

3)
What does amplitude represent? (1 mark)
What happens to elastic fibres between A-B. (1 mark)
What happens between B-C (3 + 1 marks)
Breathing rate (2 marks)
What causes residual volume of air in lungs (2 marks)
Tick type of circulatory system in humans/mammals (1 mark)

4)
Explain why haemolysis occurred and why plant cell didn't lyse (4 + 1 marks)
How to prevent RBC from bursting (1 mark).

5)
What does the fluctuation represent? (1 mark)
Describe the pressures compared to the cross-sectional areas using graph and diagrams (3 marks)
Explain why aorta curve fluctuates (2 marks)
Explain why pressure changes from aorta ------> veins (3 or 4 marks)
Explain why pressure decreases from arteries --> capillaries (2 marks)

6)
Most commonly transported sugar and tissue involved (2 marks)

Edit:
Mechanism for oxygen moving into RBC/haemoglobin (1 mark)
How are roots adapted for their function and mechanism (3 marks)

How are sugars actively loaded into phloem (3 marks)
Explain how temperature affects the drips per minutes/flow of sugar in phloem (3 marks).

There are obviously a couple more questions/marks somewhere along the lines, but those are the ones I can remember (and some stolen from AishaTara's list).

Again, I went with a physics approach

The pressure inside the lungs would eventually match atmospheric pressure, so there would be no pressure gradient between them. (Now things i should've added onto my actual answer! Exhalation is a passive process, so relies on there being a pressure gradient).

Though the stuff about surfactant and alveoli collapsing should be valid.

I put for the residual volume that if there was no air left in the lungs, they would collapse.. So the residual air keeps them inflated and it's impossible to exhale this out., or well they'd collapse ? Is that right?

Hi, for the question about identifying 2 eukaryotic organelles that aren't present in prokaryotes, did the question want them from the diagram provided or organelles that aren't in the diagram?

it was from the diagram