OCR Biology F214

Hey guys! I thought it would be nice to have a kind of question and answer thread for unit 4 biology...someone asks a question..and someone answers ^.^ This is my first unit 4 exam...because my sixth form decided to do ubit 5 first in January..and then unit 4 in june, so I need as much practice as possibleeeee!

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Reply 1

ds4143

Descride the main features of the Krebs cycle, anyone :biggrin:

?

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Reply 2

otrivine

Original post by ds4143

Descride the main features of the Krebs cycle, anyone :biggrin:

?

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please ask me from chapter 1 :wink:

Reply 3

andrew_c

Unit 4 is not too bad, had a question about glass beads that put everyone off so i reckon it will be better second time round :smile:

, im not too confident about unit 5 though :s-smilie:

Reply 4

otrivine

Original post by andrew_c

Unit 4 is not too bad, had a question about glass beads that put everyone off so i reckon it will be better second time round :smile:

, im not too confident about unit 5 though :s-smilie:

hey do you want to revise for both units ?

Reply 5

ds4143

Oohh I learnt the glass bead stuff, its not in the text book, but I got a few powerpoints on it ^.^ was the question about why glass beads are used in the 2nd test tube or something?

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Reply 6

ds4143

Ha hey

What is meant by saltatory conduction :smile:

?

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Reply 7

otrivine

Original post by ds4143

Ha hey

What is meant by saltatory conduction :smile:

?

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it is the jumping of action potential from one node of ranvier to the next

Reply 8

user977153

This is a resit for me :frown:

Got a D in January.

Reply 9

ds4143

Unit 5 I didnt do too well in, I knew the content thoroughly...but I did not practice exam questions...so now im doing all the legacy papers ...they have a mixture of both unit 4 and unit 5 because back then the syllabus was different to ours now... Try practicing them :biggrin:

may give you abit more confidence

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Reply 10

otrivine

Original post by ds4143

may give you abit more confidence

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was my answer right? and the leagcy papers like dont have questions that follows our spec ?

Reply 11

ds4143

It does follow our spec :redface:

check them out on www.pastppers.org and go on biology and on the central concepts link, all of that is defo our spec.

And yup your answers correct, also its only in myelinated neurones, ask me :biggrin:

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Reply 12

ds4143

Www.pastpapers.org/central-concepts-biology-papers

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Reply 13

otrivine

Original post by ds4143

It does follow our spec :redface:

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no its not in myleinated neurones well does not mention in the book ?

Describe difference between type1 and type 2 diabetes (3)

Reply 14

ds4143

Aw, your resitting again in june right?

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Reply 15

otrivine

Original post by ds4143

Aw, your resitting again in june right?

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who me?

Reply 16

ds4143

Oh i just checked, If you look on page 17, the paragraph under the blue box, and the last few lines kinda explain it. I guess you dont really need to mention it as its not in the glossary definition, but just be sure that waves occur in non-mylenated neurones, and jumps occur in myelinated neurones (saltatory conduction). But otherwise you got the answer correct :smile:

Type 1 diabetes occurs in younger people due to their pancreas not producing insulin. A condition called hyperglycaemia occurs, when blood glucose levels remain high.

Type 2 diabetes occurs in older people due to not being able to produce enough insulin or does not respond well to insulin. It can also be linked to obesity.

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Reply 17

otrivine

Original post by ds4143

yes thats fine answer

Reply 18

ds4143

Original post by otrivine

who me?

Nope sorry was for andrew, I didnt realise that I wasnt quoting who I was replying too, trying to get used to this app on my phone :tongue:

Oh and a question for you.. what are the advantages of using genetically modified bacterua to produce insulin instead of extracting then from aninals?

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Reply 19

ds4143

Original post by DoctorVertigo

This is a resit for me :frown:

Got a D in January.

Aw, I didnt do too well in my unit 5 exam in Jan..in fact i didnt do well at all haha, im resitting boths unit >.< are you ready for unit 4?

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