OCR Gateway Biology 2012 B1 B2 B3

Do you mean the question which was about why body cells cannot grow into an embryo? Well, I wrote that body cells would need an electric shock to divide and that it would need to be placed inside another animal so it received enough nutrients.

A friend wrote that body cells lose their ability to differentiate.

But I'n not sure which is correct. Also, I accidentally drew a tiny line into the bar code on one of the pages...Do you think they would accept it and still be able to scan it?

What did you write about the question on the holes in the heart?

I wrote convex instead of concave :// and other than that I think I've only made tiny mistakes :P hopefully an A* you?

I also wrote about vasoconstriction/ vasodilation and when it expands its skin thing, it increases surface area which increases the amount of heat absorbed but more is also lost...

For the holes in the heart question, I just blabbed about aerobic respiration being harder as deoxygenated blood can merge with oxygenated blood, and, as a result, less O2 being delivered to the respiring cells. More lactic acid produced and so forth.


We did a mock with the new specification and the mark scheme was 55% for an A I believe. Nobody in my top set for Biology achieved an A*.
What did people put for the DNA replication question? I said some stuff about DNA unzipping with mRNA and then protein synthesis (complementary base pairing with A-T .etc).

Which type of lens did you put on the 2nd question? I put concave but it was a guess

1) a) what is wrong with the shape of lens that causes problems...

What lens can correct it?

What is an allele?

Diagram asking how can we tell that allele is recessive for that Ilness..

Genetic diagram for host and carrier...

6 marker about fats and heart related deaths...

What else? On B1

DNA replication also takes place during mitosis and meisosis by the way . I wrote the DNA structure unwinds so there are now two single strands. New strands form via complementary base pairing. This information was memorised straight from the specification so it should be correct. However, the question was three marks so I assumeed the third mark was for a diagram and thus drew an abysmal diagram to show this. :P

Naaaw, do you think a mark could have been gained from mentioning mitosis/meisosis? I do feel that we were not quizzed enough about the differences between them.

What was going on with that saturated fat question? I mean, seriously... arguments for/against? I just wrote that scientists could argue for his theory as a high proportion of sat. fat in a diet can cause heart disease through clogging of arteries and the heart having to pump hard and compensate for it. Then, as a counter-argument, teh fact that a high amount of fat in each diet may be relative to the country's staple food/ persons individual diet (e.g: someone may require high amounts of energy for strenuous exercise).

What was the right definition of an allele? I put to turn a gene on/or off in the amino acids of DNA... hmmm?

b1 - drugs.
one question was why do drugs have a classification system and another one was using the table where we filled in the gaps (75000 and 5000?) and then had to write which was the dangerous i think?
then the neurotransmitter question
im not sure if the mutation question was in b1 - suggest how a change in DNA can cause illnesses like cancer?