OCR BIOLOGY F211 BIOLOGY UNOFFICIAL 2014 Question paper Watch

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Report Thread starter 4 years ago
Does anyone know the questions for the biology f211 paper.
The unofficial mark scheme answers are listed below:
Does anyone have the unofficial question paper. thanks

1a)i) Present in plant cells but not animal cells:
Chloroplasts, cell wall (2 marks)
ii) Present in animal cells but not plant cells:
Centrioles (1 mark)
1b) Description of what the cytoskeleton does:
Determines shape of cell; changes shape of cell; vesicles move down microtubules; RNA/other molecules move down microtubules (3 marks)
1c) Secretion of protease enzymes from pancreatic cells:
EXOCYTOSIS; mRNA moves out of nuclear pores to the ribosomes; ribosomes assemble the proteins;
vesicles move to Golgi body down microtubules; modified and repackaged; vesicles move to the cell surface membrane; fuse with membrane; deposit enzymes outside cell (5 marks, one for QWC)

-Xylem on top, phloem on bottom (DON'T label the middle, that's cambium) (1 mark)
-Vascular bundle (1 mark)

The balloon expands because pulling the rubber sheet down increases the volume inside the bell jar, which decreases the pressure, so air is sucked into the balloons down the pressure gradient (2 marks)
Tidal volume: Volume of air moved in and out of the lungs from a 'normal' breath at rest (2 marks)
How to demonstrate it: Pull the rubber sheet down and release it (in tandem with a student's even breaths at rest?) (2 marks)
Vital capacity: Maximum volume of air that can be inspired + maximum volume of air that can be expired (2 marks)
How to demonstrate it: Pull the rubber sheet down as far as it can go without the balloons bursting (1 mark)

a) Why erythrocytes don't enter the tissue fluid:
They're too big, 7 micrometres, can't fit through the fenestrations of the capillary wall (2 marks)
b) Haemoglobin transporting oxygen:
High affinity for oxygen; 4 haem groups, each of which can bond to one oxygen molecule; transported around body in blood; oxygen released to tissues where there is a low O2 partial pressure (3 marks)
c) How hydrogencarbonate ions are made:
Carbonic anhydrase; reaction of water and carbon dioxide to make H2CO3; dissociation into H+ ions and hydrogencarbonate ions (4 marks)
d) Carbon dioxide reaction:
Bohr shift. The H+ ions produced due to the high partial pressures of carbon dioxide bind to haemoglobin and displace the oxygen atoms, so they diffuse out of the haemoglobin into the actively respiring tissue. (3 marks)

a) Mitosis (asexual reproduction) (1 mark)
b) 3 is where differentation starts (1 mark)
c) Cell signalling (1 mark)
d) There is cell signalling with the folic acid and bacteria; and the cAMP (specific complementary receptors...molecules...trigger response...) (2 marks)
e) They can be adapted to this by having specific, complementary receptors in their plasma membranes to the molecules folic acid and cAMP, e.g. glycoproteins (2 marks)
f) It takes 17 hours to form the grex (1 mark)

2 and 3 means that charged particles (H+ ions) are transported out and then back into the companion cells, due to the changes in pH; against concentration gradient (2 marks)
4 means that the process is an active process requiring ATP from aerobic respiration. (1 mark)
Observations through electron microscope:
Large amount of mitochondria, transporter proteins in plasma membranes of companion cells
Gap fill:
Active transport, concentration, facilitated, diffusion, ARGH (amino acids is definitely correct; waiting for confirmation on glucose/fructose/maltose) (5 marks)

DEFINITIONS (1 mark each)
-Homologous pair (of chromosomes)
-Organ system
-Open circulatory system
-Apoplast pathway
Badges: 2
Report 4 years ago
managed to find this link for the ocr paper, i'm not sure whether they have included the latest 2014 paper yet. but it has the rest of the past years, links and answer too.

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Report 4 years ago
I'm going to be doing this paper this summer, any help would be appreciated

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