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

Reply 800

lauren1brown

Original post by wndms

What kind of disease can we relate the hormone adrenaline? Explanation please..?!

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You could talk about atherosclerosis :smile:

Nicotine in cigarettes causes the body to increase adrenaline levels. This increases blood pressure and heart rate meaning there is more likely to be damage to artery walls. Leading to atherosclerosis :smile:

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Reply 801

Ché.

Original post by LaughingGas

Nice answer! Full marks! :smile:

Thank you very much!
:biggrin:

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Reply 802

cookiess

3

Original post by MrMeep2580

Define Taxonomy and Phylogeny? (3 Marks)

Taxonomy: It's the study of the principles of classification and the difference between species
phylogeny: It's the study of evolutionary history of species using an evolutionary tree diagram

Reply 803

cookiess

3

Original post by Gotzz

Recognise the virus
Produce a clone
Can form plasma cells on infection, which make antibodies
They are responsible for the secondary response.

Omg...wait- how did you know LOL. Cause it says in the book that it produces immunological response but doesn't explain how etc...I'm guessing you did the past paper for this question already haha

Reply 804

Gotzz

13

Original post by cookiess

Omg...wait- how did you know LOL. Cause it says in the book that it produces immunological response but doesn't explain how etc...I'm guessing you did the past paper for this question already haha

Lmao, yeah I've done the past paper :biggrin:

Reply 805

kited4

What do we need to know about allopatric and sympatric speciation - and stabalising, disruptive and directional selection?

Reply 806

xKaylax

2

Have I got this right.. the difference between T and B lympthocytes are T cells mature in the thymus gland and respond to the bodies own infected cells. B cells mature in the bone marrow and respond to foreign pathogenic cells?

Reply 807

cookiess

3

Original post by kited4

What do we need to know about allopatric and sympatric speciation - and stabalising, disruptive and directional selection?

Allopatric: It's speciation which is a result of geographical seperation e.g. what happened on the galapogas island. For example if there are two groups of the same species living on different islands, they are unlikely to breed
Sympatric: It's speciation which is not a result of geographical seperation. This speciation can be behavioural e.g. a courtship dance is not recognised; it can be biochemical e.g. species cannot fertilise the egg
Directional selection: It's a selection pressure- it's a external pressure that drives evolution in a particular direction
And the others I haven't heard of O_O

Reply 808

wndms

1

Original post by lauren1brown

You could talk about atherosclerosis :smile:

Nicotine in cigarettes causes the body to increase adrenaline levels. This increases blood pressure and heart rate meaning there is more likely to be damage to artery walls. Leading to atherosclerosis :smile:

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Thank you!

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Reply 809

TheSnail

17

Original post by kited4

What do we need to know about allopatric and sympatric speciation - and stabalising, disruptive and directional selection?

I know about these, I think you need to know how they cause speciation (geographical or reproductive barriers etc)
Directional is due to selection pressures, drive evolution in a certain direction.

I've never heard of the others and I've done all the past papers more than once...so that scares me :s-smilie:

(edited 10 years ago)

Reply 810

kited4

Original post by cookiess

Allopatric: It's speciation which is a result of geographical seperation e.g. what happened on the galapogas island. For example if there are two groups of the same species living on different islands, they are unlikely to breed
Sympatric: It's speciation which is not a result of geographical seperation. This speciation can be behavioural e.g. a courtship dance is not recognised; it can be biochemical e.g. species cannot fertilise the egg
Directional selection: It's a selection pressure- it's a external pressure that drives evolution in a particular direction
And the others I haven't heard of O_O

Thanks

my teacher taught us that- and he has a terrible habit of not teaching us stuff that we actually need to know and spending ages on pointless stuff to the extent where we had to self teach most of food and health! :frown:

i guess we dont need to know it - thanks guys :colondollar:

Reply 811

wndms

1

"Explain how biodiversity may be considered at different levels:habitat, species and genetic"
This is what it says inthe specification, can anybody help me what we are supposed to say? :/

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Reply 812

Ché.

Original post by wndms

"Explain how biodiversity may be considered at different levels:habitat, species and genetic"
This is what it says inthe specification, can anybody help me what we are supposed to say? :/

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Oh!
This is the first paper of the Biodiversity specification...
It is much more simpler than it sounds!
It is talking about the different forms of variety in living organisms..

I'll take a picture!

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(edited 10 years ago)

Reply 813

TheSnail

17

Original post by wndms

"Explain how biodiversity may be considered at different levels:habitat, species and genetic"
This is what it says inthe specification, can anybody help me what we are supposed to say? :/

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Habitat - The range of habitats in which different species live
species - the number of different species
genetic - genetic variation between individuals within a species

Reply 814

Ché.

Original post by wndms

"Explain how biodiversity may be considered at different levels:habitat, species and genetic"
This is what it says inthe specification, can anybody help me what we are supposed to say? :/

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ImageUploadedByStudent Room1370168002.034810.jpg

Here!

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Reply 815

MedMed12

21

Original post by otrivine

Yes, those the ones I said was the answer, but for you is fine! Use your A2 knowledge as well then the examiners would be very impressed with the quality of your answers :wink:

:P aha I will do, so worried we might get a occurrence of last June :frown:

aiming for full UMS this time-will save me stress on F215

Reply 816

wndms

1

Original post by Ché.

Here!

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Ah thank you!

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Reply 817

MedMed12

21

Original post by kited4

What do we need to know about allopatric and sympatric speciation - and stabalising, disruptive and directional selection?

A2

Reply 818

MedMed12

21

Original post by g.k.galloway

I know about these, I think you need to know how they cause speciation (geographical or reproductive barriers etc)
Directional is due to selection pressures, drive evolution in a certain direction.

I've never heard of the others and I've done all the past papers more than once...so that scares me :s-smilie:

see above