OCR Biology A Exam Thread (Breadth - May 26, 2016 and Depth - June 7, 2016)

With regards to the erythrocytes question about viruses and the plasmodium, I answered as above except that I included the idea that the plasmodium can feed on the cell contents.

Reply 824

indrx__

Original post by 11234

For the zoo question did anyone put use artifical insemination or invitro fertilisation

Yes i wrote about IVF aswell, think it is wrong though as everyone else is saying something else :/

Reply 825

Original post by wojiaoshakira

I wrote something about how capillaries are one cell thick so there is a short diffusion distance.

I wrote that too :smile:

2 marks hopefully for saying that.

Reply 826

Original post by ultralightbeam

average grade boundaries are around 65% for an A for f211 and f212. If OCR are feeling generous they'll lower them to 55% - 60% since we're new spec

I think:

A - 50
B - 45
C - 40
D - 34
E - 28

It might look a bit generous but this is the new specification. Since the old specification does not even give 80% for an A, I thought that the grade boundaries will be set like this.

Reply 827

For the malaria and virus question I said;

The female mosquito Anopheles is an example of indirect tranmission that harms the host cell via an intermediate (vector) which enters the blood stream for warmth and feeding on the host cell. However, virus attacks the cells to prevent immunisation to occur. How many marks do you reckon I will get out of 3?

For the zoo conservation question I put down providing medication will prevent the species from suffering any diseases and contributing to the death of organisms. Will I get the mark?

(edited 7 years ago)

Reply 828

Did anyone put B for the question that said which is the neutrophil on blood strain or whatever it was on MCQ?

Reply 829

I did, yeah, I thought it had the most 'multi-lobed' nucleus.

Did anyone think that the numbers for the microscopes question were completely different to the numbers that they got given in class? It really frustrated me because I went out of my way to learn them and what should've been an easier question is now something I may have gotten wrong.

Reply 830

Original post by Astro_Joe

I did, yeah, I thought it had the most 'multi-lobed' nucleus.

Did anyone think that the numbers for the microscopes question were completely different to the numbers that they got given in class? It really frustrated me because I went out of my way to learn them and what should've been an easier question is now something I may have gotten wrong.

I put A for that I believe, or C I can't remember.
The magnification for light microscope was x1500 and in nanometres it was 200.

(edited 7 years ago)

Reply 831

James3000117

Original post by Astro_Joe

I did, yeah, I thought it had the most 'multi-lobed' nucleus.

Did anyone think that the numbers for the microscopes question were completely different to the numbers that they got given in class? It really frustrated me because I went out of my way to learn them and what should've been an easier question is now something I may have gotten wrong.

Yeah we were told Light 1500x 200nm, TEM 500000x 0.2nm, SEM 100000x 10nm but that wasn't an option. Most people I have spoke to after the exam put C. (the one with light at 200nm resolution and TEM and SEM at 0.2)

Reply 832

nwmyname

13

Grade boundaries should be 49 for an A. All past papers have been 70% for an A so this may be lower due to a new spec and uncertainty in the breadth content.

May be lower, but I doubt they would be that harsh!

Reply 833

maxross

Isn't amylase a protein though?

Reply 834

Original post by oni176

I put A for that I believe.
The magnification for light microscope was x1500 and in nanometres it was 200.

I put D but that was because it seemed like the other figures were most similar to the ones I learnt.

Reply 835

Original post by nwmyname

Grade boundaries should be 49 for an A. All past papers have been 70% for an A so this may be lower due to a new spec and uncertainty in the breadth content.

May be lower, but I doubt they would be that harsh!

I think around 50-52. You are right, but if they do lower it, then it won't be less than 49.

Reply 836