oak12
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Alright Guys,

as before - this will be a full day revision forum for Unit 2

i will endeavor to answer any questions on Unit 2

before that - take a read thru the Unit 2 Revision Notes ive attached as that may answer many of your questions
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reindeer333
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Hi I am confused about why the DNA mass halves but the chromosomes does not half during mitosis, could you please explain this?
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oak12
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(Original post by reindeer333)
Hi I am confused about why the DNA mass halves but the chromosomes does not half during mitosis, could you please explain this?
the dna mass goes from 92 dna molecules (interphase) to 46 dna molecules (diploid)

the chromosome number goes from 46 chromosomes to 46 chromatids
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Ayub234_pro
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Hi there

I wanted to know the explanation behind the lack of proteins which lead to Kwashiorkor occurring.thanks

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oak12
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(Original post by Ayub234_pro)
Hi there

I wanted to know the explanation behind the lack of proteins which lead to Kwashiorkor occurring.thanks
lack of protein in the diet leads to oedema (swelling in the tissue due to build up of tissue fluid)

why? the water potential in the capillary will not be as low as normal, so not as much tissue fluid moves back into the capillary by osmosis, therefore build up of tissue fluid
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Stefanieficur
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Thanks OP for the document is very useful for all knowledge content. Do you think you could do something similar going over the application side, i.e what makes something accurate, what makes something reliable, those sorts of things in application questions. It can be very confusing to tell if a questions wants you to state an increase in reliability or accuracy or comparability or lowering of bias.
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oak12
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(Original post by oak12)
lack of protein in the diet leads to oedema (swelling in the tissue due to build up of tissue fluid)

why? the water potential in the capillary will not be as low as normal, so not as much tissue fluid moves back into the capillary by osmosis, therefore build up of tissue fluid
Why do we calculate ratios orpercentages with data? For easier comparison, because differentgroups have different starting numbers/masses


Why do we take a large sample size?More representative, findings not due to chance


Why do we take random samples?Avoid bias


Why do we take repeats? Identifyanomalous results and calculate a reliable mean


Why do we have controls? To seethat what we are testing (e.g. drug) is causing the effect


How do we treat control groups?Treat exactly the same but donot give the drug, give a placebo
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chloeaccount1
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any predictions for what the 6 marker will be?
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ambzzz
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Hi, can someone please give me the list of definitions and their meanings which we need to know for this unit?
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oak12
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(Original post by chloeaccount1)
any predictions for what the 6 marker will be?
ok, previous 6 markers:

jun 09 = adaptation of gills

jan 10 = evidence of relationship between organisms

jun 10 = reduction of genetic diversity

jan 11 = structure and function of arteries

jun 11 = antibiotic resistance of bacteria

jan 12 = transport of oxygen

jun 12 = formation and return of tissue fluid

jan 13 = dna replication

jun 13 = transport of water up the yxlem

possibilities: compare discontinous and continuous variation, properties of triplet code, role of chromosomes in mitosis, processes producing variation in meiosis, structure of starch/glycogen/cellulose, adaptation of palisade cells for photosynthesis, adaptation of capillaries, factors that affect rate of transpiration, adaptation of xerophytes
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oak12
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(Original post by ambzzz)
Hi, can someone please give me the list of definitions and their meanings which we need to know for this unit?

all the relevant ones in the unit 2 revision notes
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chloeaccount1
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(Original post by oak12)
ok, previous 6 markers:

jun 09 = adaptation of gills

jan 10 = evidence of relationship between organisms

jun 10 = reduction of genetic diversity

jan 11 = structure and function of arteries

jun 11 = antibiotic resistance of bacteria

jan 12 = transport of oxygen

jun 12 = formation and return of tissue fluid

jan 13 = dna replication

jun 13 = transport of water up the yxlem

possibilities: compare discontinous and continuous variation, properties of triplet code, role of chromosomes in mitosis, processes producing variation in meiosis, structure of starch/glycogen/cellulose, adaptation of palisade cells for photosynthesis, adaptation of capillaries, factors that affect rate of transpiration, adaptation of xerophytes

thankyou, but what is continuous and discontinuous variation?x
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ASDFGHJKL8
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What is continuos and discontinuous variation, what are adaptations of insects for efficient gas exchange, could you explain the lymphatic system and how are leaf cells adapted to photosynth&water loss prevention?

thank you
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samdemby
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(Original post by oak12)
ok, previous 6 markers:

jun 09 = adaptation of gills

jan 10 = evidence of relationship between organisms

jun 10 = reduction of genetic diversity

jan 11 = structure and function of arteries

jun 11 = antibiotic resistance of bacteria

jan 12 = transport of oxygen

jun 12 = formation and return of tissue fluid

jan 13 = dna replication

jun 13 = transport of water up the yxlem

possibilities: compare discontinous and continuous variation, properties of triplet code, role of chromosomes in mitosis, processes producing variation in meiosis, structure of starch/glycogen/cellulose, adaptation of palisade cells for photosynthesis, adaptation of capillaries, factors that affect rate of transpiration, adaptation of xerophytes

could you please answer these questions (brief points for each)
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Stefanieficur
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yeah just some points on the 6 markers would be extremely useful! Also is there any chance of a question involving water entering fish, where the mouth opens and mout floor falls so the pressure decreases water moves in agianst conc gradient ect ?
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oak12
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(Original post by chloeaccount1)
thankyou, but what is continuous and discontinuous variation?x
Discontinuousvs Continuous Variation? discontinuous = characteristics fallinto certain groups with no overlap (e.g. blood group) – determinedby genetics only AND continuous = characteristics show a range(e.g. height) – determined by genetic and environmental factors
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oak12
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(Original post by ASDFGHJKL8)
What is continuos and discontinuous variation, what are adaptations of insects for efficient gas exchange, could you explain the lymphatic system and how are leaf cells adapted to photosynth&water loss prevention?

thank you

adaptation of insect: - spiracles to allow air in and out
- tracheoles have a large surface area
- tracheoles have a thin wall
- tracheoles connect directly to cells
(short diffusion distance)

lymph system: picks up excess tissue fluid and deposits in vena cava
(circulatory system)


other questions in unit 2 revision notes ive attached
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chloeaccount1
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how would you compare the two types of variation?
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Chellz
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Can I have a 6 mark answer for:
Symplastic pathway and Apoplastic pathway
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code187
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(Original post by oak12)
Alright Guys,

as before - this will be a full day revision forum for Unit 2

i will endeavor to answer any questions on Unit 2

before that - take a read thru the Unit 2 Revision Notes ive attached as that may answer many of your questions
Can you ask if OC can run a thread on unit 2 as well?
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