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OCR Biology F212 Revision [3rd June 2013] (Now Closed)

why the grey squirrel populus may be lower than the red squirrel even though the sampling of people says the opposite?

I put:
Red squirrels only come out at night, people not around at night.
Grey squirrels may be counted twice by two different people.

put the recounting bit
also put may be mistaken for same species or other species of squirrel as they appear similar

Reply 1581

Kayess67

For the 7 mark phagocyte question, it said describe how pathogens are destroyed AFTER the antigens are presented on the phagocyte cell surface. So surely this question was requiring you to talk about the cell-mediated response and T lymphocytes differentiating into T killer cells and secreting H2O2 into infected cells? I wrote about phagocytosis too just in case :tongue:

Reply 1582

Moon1ight

15

For the squirrel question - I put its part of a food chain or ecosystem and aesthetic value- it's been like that for every question of that type before surely it's right

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Reply 1583

LostPlanet2Luke

2

When "Stahl" came up, did anyone else think of General Stahl from Killzone 3?
Please don't say I'm the only 1.

Reply 1584

Liamnut

13

Original post by theCreator

I put because grey squirrels are in plain sight more often since they are mostly on the ground. Then I also put they may have counted some squirrels twice.

I don't think red squirrels come out at night...Squirrels aren't nocturnal.

The answers were in the question.

Red are more scared of humans, therefore they're harder to spot.
Red spend more time in trees, therefore they've harder to spot.

Of course, I jazzed up the answers a bit in the exam.

Reply 1585

kited4

Original post by krishkmistry

Anyone put high tensile strength for the property of collagen ?

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yer

Reply 1586

NielsBohrsDad

Original post by MrMeep2580

why the grey squirrel populus may be lower than the red squirrel even though the sampling of people says the opposite?

I put:
Red squirrels only come out at night, people not around at night.
Grey squirrels may be counted twice by two different people.

I wrote a population of them may have died out in a different area

And forgot what else. I suppose youre right mt mind went blank for.these

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Reply 1587

Moon1ight

15

Original post by Kayess67

For the 7 mark phagocyte question, it said describe how pathogens are destroyed AFTER the antigens are presented on the phagocyte cell surface. So surely this question was requiring you to talk about the cell-mediated response and T lymphocytes differentiating into T killer cells and secreting H2O2 into infected cells? I wrote about phagocytosis too just in case :tongue:

It said after its attatched to the phagocyte

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Reply 1588

username1107833

2

Original post by kayess67

for the 7 mark phagocyte question, it said describe how pathogens are destroyed after the antigens are presented on the phagocyte cell surface. So surely this question was requiring you to talk about the cell-mediated response and t lymphocytes differentiating into t killer cells and secreting h2o2 into infected cells? I wrote about phagocytosis too just in case :tongue:

omg i put about phagocytosis, am i wrong ffs

Reply 1589

aliman65

15

Way too many ecological questions. Also way too many questions that were unclear what you needed to answer, especially the first question (primary structure is what I put down but it could have been protein or polypeptide also).

Reply 1590

Sam_1996

The first question on the enzymes section
What was the answer?

Reply 1591

Liamnut

13

Original post by Kayess67

For the 7 mark phagocyte question, it said describe how pathogens are destroyed AFTER the antigens are presented on the phagocyte cell surface. So surely this question was requiring you to talk about the cell-mediated response and T lymphocytes differentiating into T killer cells and secreting H2O2 into infected cells? I wrote about phagocytosis too just in case :tongue:

Welp, I just spoke about phagocytosis :3 I'm stuffed.

Reply 1592

skywalker12

13

Original post by ellie2996

Help!

Did you have to draw the amino acid or write its formula!?!

Had to draw it i think

Reply 1593

Majeue

1

Original post by theCreator

I put because grey squirrels are in plain sight more often since they are mostly on the ground. Then I also put they may have counted some squirrels twice.

I don't think red squirrels come out at night...Squirrels aren't nocturnal.

I put grey squirrels can fly so are often seen around and red squirrels are highly susceptible to getting eaten by dogs so they hide in the trees a lot.