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    (Original post by moonandstars)
    Yes I would love to know this !
    The most probable question regarding the human genome project would probably be its implications:
    - insurance companies may discriminate between individuals, especially those people who have a higher chance of having a disease
    - medical treatments specific to particular alleles/genes are more expensive which may create a two tier-health system
    - there has to be a person deciding who has access to all the information
    - someone knowing that they have a higher chance of cancer may be psychologically stressed throughout their whole life even if they never develop the disease
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    (Original post by iluv)
    We don't need to know a lot of detail for that, you usually get the mark for just saying "calibrate the volume" of the respirometer. The main points are:
    -one peak represents one breath
    -distance from peak to trough is tidal volume
    -counting number of peeaks in one minute gives you breathing rate
    -measure the tidal volume of several peaks to work out a mean, increasing reliability
    -take one reading at rest and one after exercise
    -if comparing two groups of people make sure to standardise gender, age, etc.
    -after exercise distance between two peak decreases
    -tidal volume increases
    -the gradient of the graph is steeper due to increased O2 consumption
    I don't mean to alarm you but you're talking about a Spirometer not respirometer
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    (Original post by iluv)
    The most probable question regarding the human genome project would probably be its implications:
    - insurance companies may discriminate between individuals, especially those people who have a higher chance of having a disease
    - medical treatments specific to particular alleles/genes are more expensive which may create a two tier-health system
    - there has to be a person deciding who has access to all the information
    - someone knowing that they have a higher chance of cancer may be psychologically stressed throughout their whole life even if they never develop the disease
    also on june 2012 there was a whole question on it just asking for the definition, ethical issues and how it helped develop a drug
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    (Original post by PhysicsIP2016)
    I don't mean to alarm you but you're talking about a Spirometer not respirometer
    Oh damn I just realised, sorry! Let's try this again:

    1. Need a mass of respiring tissue
    2. Empty test tube as a control/or same mass of beads in control test tube
    3. Use a syringe to set the liquid to a known point/ to 0 (this is what they mean by calibrating I think)
    4. Put KOH at the bottom of the test tube with the respiring tissue so CO2 released is absorbed and there is a difference in the net pressure of the test tube
    4. Use thermostatically controlled water baths to maintain a constant temperature, increasing validity
    5. Let the tissue respire for a set period of time e.g. 5 hours
    6. Measure the distance the coloured liquid moved
    7. Using the known radius of the capillary tube and the distance the liquid moved work out the volume of oxygen consumed
    8. Divide this volume by the set amount of time to find rate of respiration
    9. Repeat to increase reliability
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    (Original post by mxntrose)
    also on june 2012 there was a whole question on it just asking for the definition, ethical issues and how it helped develop a drug
    Oh yh! Do you remember the definition? I can't remember
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    Could someone go over Baroreceptors, stretch receptors and chemoreceptors and when they are used? also are baroreceptors same as pressure receoptors
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    do we need to know the complete structure of an eye??
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    What's hormonal Co ordination ? (4 mark question asking to compare hormonal Co ordination to mechanism of auxin in plants, June 2011)
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    How would the 'toggle switch' work? is it to do with binding to transcription factors etc.?
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    (Original post by _H_V)
    What's hormonal Co ordination ?
    If its the same as endocrine then:

    growth and sexual development of an mammal due to chemical messages within the blood that circulate within the blood plasma. they are slow acting and take a long time to be put into action, eg.: why growth so slow acting.
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    Thankssss
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    Something along the lines of; 'All of the genes of the Human Species & their location (locus) on the chromosomes'.
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    (Original post by iluv)
    Oh yh! Do you remember the definition? I can't remember
    its like the complete DNA sequence for an organism or something along those lines
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    (Original post by fpmaniac)
    Hey, can you post some of the questions you would think should come up in the pre release please
    - differences between the process of transcription and replication, DNA and RNA, Yeast and bacteria
    - Risks associated with GM crops
    - Fermentation
    - Totipotent, pluripotent stem cells
    -'kill switch'
    - 'keep track of radiation within a cell' some radiation can be mutagens, what is a mutagen and how will it affect the protein synthesised
    - implications of synthetic biology
    - gene expression/ transcription factors/ specialisation
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    (Original post by _H_V)
    What's hormonal Co ordination ? (4 mark question asking to compare hormonal Co ordination to mechanism of auxin in plants, June 2011)
    stimulus - receptor - hormone - effector - response
    In plants, hormonal co ordination uses chemical impulses which travels between cells in the cytoplasm.
    the hormones move away from the production site
    it is a slow process and long term
    auxin is a hormone which allows growth of a plant, IAA is an example, it is produced in the shoot. when photorecptors detect unidirectional light, IAA accumulates to the shady side of the shoot. IAA enters the nucleus, binds to transcription factors to form a transcription initiation complex. this binds to the promoter region of DNA which regulates the expression of genes. Genes are activated to allow the cell to elongate. elongation allows the shoot to bend towards the light, as cells on the shady side are longer the cells on the non shady side.
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    *****ing bricks for this one. Biology can SMD after today!
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    Could someone post a "model answer" for how kill switches work? I get it but I don't know what like buzz words they'd be looking for. So excited for this exam to be over and I am freeeeee
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    Really hope little AS comes up. Wouldn't mind if they put some unit 4 in this paper!
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    Yeah you're right would be nice to actually show off our unit 4 revision as we only got to use about 10% of it last time hahaha
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    (Original post by moonandstars)
    Yeah you're right would be nice to actually show off our unit 4 revision as we only got to use about 10% of it last time hahaha
    Exactly hahaaaa!
 
 
 
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