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Biology (new spec) 1st June OCR - How did it go?

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Reply 60

skatealexia

What did everyone get for the vulture previous population?

Reply 61

LearningMath

Xerophelistica

LearningMath, up there you said the emphysema question was nothing to do with nicotine - but surely nicotine paralyses the cillia, meaning the mucus and tar don't get shifted out of the lungs, which causes the problem in the first place?

I only ask because that's similar to what I wrote :smile:

Tar paralyses cilia not nicotine i believe. I forgot to pick up the paper today so ill grab one tomorrow and post it so we can go through it like jan. Someone else might post a copy though! :biggrin:

Reply 62

Wakeke

I got 133,333.33333 for the vulture population, rounded it to 133,333.

Reply 63

Mrcarrot

Xerophelistica

I was waiting for this thread to get made :P

I hope everyone remembered that the place where Plasmodium reproduces is in the Liver? When I did that question I got a feeling some people would put Blood.

Overall, a good paper though :smile:

Hopefully got I got an A. Only one more exam (Chemistry) to go now!

Wikipedia says that plasmodium enters the body and invades hepatocytes where they mature and divide, and are then released. They then invade erythrocytes where they grow once more and divide, feeding off the haemoglobin, and release more to invade more red blood cells.

Realistically I think if you put erythrocyte or hepatocyte you'd get the mark- I put erythrocyte myself. I don't think you'd get it for 'blood' or 'liver', because the question did say 'a cell' rather than 'the cell'.

Reply 64

Eddie91

i wondered if it was red blood cells or liver cells but it didnt say name 'the cell' so i think im ok :smile:

.
i messed up on why u couldnt find a vaccine for malaria, just put that it mutates, was worth 3 :frown:

put discontinuous variation as there were no inbetween idk how u could get 3 marks for explaining it tho

didnt have a calculator for the population question but got 133,334?
on the emphysema i put cigarette smoke contains elastase lol

overall i think ive got the mod1 qs right as we spent like 4 months doing it, most of the mod2 and 3 ones wrong...

NVM! :smile:

Reply 65

v1oXx-

Let's try making an unofficial markscheme?

Q1)
-antiparralel, double helix, phosphate-sugar.
-data in table, no. of a+t is similar, no. of g+c are similar, no of a and t decrease going down the group.
-helps scientists to understand base pairing etccc
-DNA 2 strands, has thymine, deoxyribose. RNA: 1 strand, has uracil, ribose sugar.

I've got to eat... hopefully this'll be added to by others?

Reply 66

LearningMath

Wakeke

I got 133,333.33333 for the vulture population, rounded it to 133,333.

Same, loads of my mates thought it looked odd though so overlooked it and came up with a load of other answers!

Reply 67

chuck111

Guts what did u put for the breeding one????

I put u pick the ones with the most flowers on it and which shows the most resisitance and breed those together..then breed offspring nd so on

Reply 68

Xerophelistica

LearningMath

Tar paralyses cilia not nicotine i believe. I forgot to pick up the paper today so ill grab one tomorrow and post it so we can go through it like jan. Someone else might post a copy though! :biggrin:

Damn you're right.. Thanks.

Reply 69

*Gee*

I hated the malaria vaccination question and the alveoli question which was like arghhhhhhh! It went ok not bad but not amazing!

Reply 70

LearningMath

v1oXx-

We need a paper first!

Reply 71

Wakeke

For the breeding I just said breed a high resistance with a high yield, then repeat for several generations seemed so simple I wasn't sure if I was missing something out.

Reply 72

Xerophelistica

v1oXx-

You forgot Hydrogen for the very first part!

Reply 73

Moabubaker

LearningMath

We need a paper first!

Any chance you can get the paper please ? Like you did for unit 1.

Reply 74

Wakeke

How do you get hold of the paper so early? Is it available to teachers as soon as the exam is over?

Reply 75

Wakeke

v1oXx-

I think it was polypeptide, not phosphate-sugar but no point debating till we get the paper I guess :wink:

Reply 76

LearningMath

chuck111

Guts what did u put for the breeding one????

I put u pick the ones with the most flowers on it and which shows the most resisitance and breed those together..then breed offspring nd so on

Mmm... I first explained mark assisted selection. Then said a series of plants should have there genomes examined and those with desirable traits such as large maximum growth, fast growth rate and resistance to what disease it was. These plants with desirable traits should then be isolated from populations and clones(cuttings) made. Thus a new generation of plants with desirable traits has been produced.