AS OCR Biology Depth 07/06/16 Unofficial Mark Scheme

Was there any repetitions in the depth Bio paper from the breadth?

Oh right Probably got it wrong either way

Also, I think the textbook means within 5% significant difference is shown, so a value of 0.01-0.001 is in that range. I don't think it means use the 0.05 value in the table, not entirely sure though.

What did people get for the MRSA question for the % increase? You had to find the year at which the numbers peaked which i thought was like 498 one for S.aurea (forgot the MRSA number!).. I did the difference which was like 1154 and divided by the smaller number which was 498 then X100. Is this right??

The year was 2006 and the % increase was something like 3200 I think.

I thought you only had to look at the MRSA values!

Oh.. well for a percentage change I thought you had to use both values.. Maybe that's where I went wrong! So you used the 1993 number and 2006 number difference, then divided by the smaller number (498) to give you 3200??

Yeah, I got 3204 but I had to round it to 3sf

Yes, that makes sense now. I got something like 232!!! Oops, just another thing I got wrong! Hated that paper so much! Anyone else with me?!

Did you not read the table? The value of 13.834( or whatever) fell in the range from 0.01 and 0.001 p.

Oh right Probably got it wrong either way

Also, I think the textbook means within 5% significant difference is shown, so a value of 0.01-0.001 is in that range. I don't think it means use the 0.05 value in the table, not entirely sure though.

No I don't think so! But the 6 markers weren't what I expected. Thought they were going to be better and proper biological processes like DNA replication, Protein Synthesis, Water's properties & functions.. etc. Really disappointed with that paper really.

Trust me my teacher told me you use only p=0.05 to compare with. We did an exact question like it and thats what the mark scheme also said. I don't know why you use it but for biology it is. The other values are for different things not relevant to biology.

Trust me my teacher told me you use only p=0.05 to compare with. We did an exact question like it and thats what the mark scheme also said. I don't know why you use it but for biology it is. The other values are for different things not relevant to biology.

What did you all get for the one about the smooth muscle contracting?? It sounds really stupid saying this but I had no idea!

No, it is relevant, I did this in psychology and the values are chances that the difference is due to chance. In biology and all other sciences really, we can usually accept that results are significant if we only allow 5% chance that the results are due to chance and there is really no significance. 0.001 would mean that theres a 0.1% chance it is due to chance so you could use that and say it is very significant.

Trust me my teacher told me you use only p=0.05 to compare with. We did an exact question like it and thats what the mark scheme also said. I don't know why you use it but for biology it is. The other values are for different things not relevant to biology.

Name another that isn't controlled (1)
Volume/drops of indicator on white tile

Name one that is controlled (1)
Time/intervals of testing solution

Alternative what would happen as a result of chitin (1)
-Mites may be vectors and cause disease
-May bite through tracheoles and leak tracheal fluid (disrupt gaseous exchange)


percentage increase of death from MRSA from 1993 to peak (2)
-3140%

1. Volume, I think if I done it correctly, was stated for substrate and enzyme. However substrate was only given as 5cm^3 with no concentration given so I think it must be the substrate concentration not kept same (enzyme concentration was given as a percentage.)
2. Enzyme concentration (since only 4 factors of enzyme reactions... Sub/Enz Concentrations, Temp, pH.) everything else was changing except enz conc. But you may be right for mentioning time interval.

3. I wrote: (those pathogen in Bee) may block the Tracheole (by bundling or travelling through smaller tracheole), preventing fluid ventilation of the tissue therefore dissolved gases cannot be exchanged -> Bee feels tired

4. I got 670%
Although almost all of my friends got similar to 3200%.
One thing. It cannot be negative like in the answer since it's % Increase.