Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by SwordStream)
    I dunno mate. I've been at it since 10 this morning. Might catch some zeds soon.
    Which topics have you still got to do ?
    Offline

    0
    ReputationRep:
    Most things on genetics - will go over in the morning

    and muscles

    Im off to bed X_X
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by SwordStream)
    Most things on genetics - will go over in the morning

    and muscles

    Im off to bed X_X
    Gn.
    Offline

    0
    ReputationRep:
    (Original post by ibysaiyan)
    Ty. I will go through them in a bit.They better be what the spec. wants us to know.

    ;P
    xD ehm have a look at your text book as well so your 100% alright with behaviour (^^,) 2 more points id like to add that i forgot ehm classical conditioning is involuntary and passive
    operant conditioning is voluntary and active and is often referred to as trial and error learning
    And thats everything from the heinemann book on behaviour

    Lol feels weird this is the first bio exam i have ever revised for lool!!
    Offline

    0
    ReputationRep:
    (Original post by ibysaiyan)
    ....
    BTW what topics are you going over tonight?
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by mathsclown)
    BTW what topics are you going over tonight?
    Hm... All of module four and then a quick rewind from the whole spec.
    :P :P
    Offline

    0
    ReputationRep:
    (Original post by ibysaiyan)
    Hm... All of module four and then a quick rewind from the whole spec.
    :P :P
    Yup same here, going to review it and do all the questions in the book
    Offline

    2
    ReputationRep:
    You can start aking me questiions now
    Offline

    0
    ReputationRep:
    Just finished revision FINALLY!! lol been up for the last 2 days straight learning the whole book Need sleep!!).

    guys wot do u think the hardest module is in f215??
    Offline

    2
    ReputationRep:
    (Original post by rtzj00)
    Just finished revision FINALLY!! lol been up for the last 2 days straight learning the whole book Need sleep!!).

    guys wot do u think the hardest module is in f215??
    Have you done any of the past papers or questions in the book/back of the heinmann book?
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by rtzj00)
    Just finished revision FINALLY!! lol been up for the last 2 days straight learning the whole book Need sleep!!).

    guys wot do u think the hardest module is in f215??
    Hmm tbh None are hard.. for module one genetics practice more on past papers.. other than that meh :/
    Offline

    2
    ReputationRep:
    Fell free to pot questions and I will try my best to answer them
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by Summerdays)
    Fell free to pot questions and I will try my best to answer them
    LOL you are awake... :P I have muscles and animal behavior to finish.IDK which questions ons to think of.. hmm ooo yea gibberlins mary jones book doesn't have much on it.What do you know about it ?
    All I know is that GA shows it's effect by gene expression.It binds onto protein receptors in the cells which in chain of reaction activate DELLA protein.This protein breaks down into a transcription factor which transcripts a gene for rapid growth of stem.
    • Thread Starter
    Offline

    14
    ReputationRep:
    Right I will start with tropism.
    Tropism is a directional growth response to a stimulus.A plant shoot exhibits positive phototropism while the root shows negative phototropism.
    Movements which don't depend on the direction of stimulus,are reversible and happen due to changes in cell turgidity are called nastic movements.


    Phototropism is where plant growth occurs due to light.Auxin is the plant hormone involved in the elongation of stem.Light falling on the un-shaded are phophorylates photo-tropins.Phototropins are protein light receptors which abosrb blue light.As a result of phosphorylation an auxin gradient is formed flowing through un-shaded area to shaded.This is caused because transporter proteins are either activated as such they work more harder on one side than the other or that there are more number of them.Auxins bind onto the cell membrane receptors.In doing so the hydrogen ion conc. is fluxed,more h+ ions stay in resulting lower Ph.This activates enzyme which breaks through the cell walls/causing them to lose.Water enters by osmosis causing cells to increase in size.This effect is permanent.
    Auxin is made at the tip of plants/germinating seed - Coleoptile.
    • Thread Starter
    Offline

    14
    ReputationRep:
    outline the role of hormones in leaf loss in
    deciduous plants;

    Leaf loss/abscission is caused by the following plant growth regulators:
    Auxin,Ethene, Abscisic acid


    In a young leaf leaf loss does not occur because they produce plentiful of auxin.Auxin itself inhibits plant loss.As the leaf ages,auxin concentration decreases.This makes the leaf sensitive to ethene.Ethene production increase which inhibits auxin production.This change in concentration produces Abscisic layer "made of thin walls" which is broken down by enzymes.Prior to breakage a protective tissue is made by the plant called suberin to prevent pathogen entry.



    describe how plant hormones are used
    commercially


    Ethene:Is used to ripen fruits hence fruits can be harvested early and made to ripe before the point of sale.

    Auxin:Is used as a herbicide for some species of plants because it passes through the transporter proteins but don't go through the different set of outgoing t. proteins.The plant dies as a result of this.
    Is used to produce seedless plants without the pollination of flower.


    Gibberlins : Causes rapid growth of stem.In sugar cane this causes more productivity of sucrose.
    Increases the size of fruit.
    Is used in the brewing industry for the conversion of barley into alcohol.



    Apical dominance is when the apex of the shoot grows and due to which lateral bud's growth is inhibited.
    Auxins are involved here AGAIN.

    At the tip of the shoot called apical meristem is where auxin is produced.Cells here constantly divide.Auxin goes down due to gravity.As it accumulates at the nodes on the lateral buds,it inhibits their growth.
    Two experiments to prove it are:
    1) Place a growing shoot upside down,you'll notice that apical dominance doesn't occur because auxin can't go against gravity.
    2)Cut the top of the shoot (terminal bud),place synthetic auxin.Apical dominance takes place.



    DONE........................ Now off to muscles xD xD
    • Thread Starter
    Offline

    14
    ReputationRep:
    Grrrr nervous system is such a pain......
    • Thread Starter
    Offline

    14
    ReputationRep:
    How much info do we need to know on biceps/triceps ?
    Offline

    0
    ReputationRep:
    Too much for my liking. Yet to go over muscles.
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by SwordStream)
    Too much for my liking. Yet to go over muscles.
    I am almost done with muscles... man... I hope ALL THIS INFO STAYS INTACT GRRR I REALLY WISH EXAM WAS LIKE IN ERMM 3 HOURS... :P Oh well.. Once I am done i will do past papers... quickly and then a quick skim through genetics...
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by SwordStream)
    Too much for my liking. Yet to go over muscles.
    Okk this is all what the book says on these muscles:
    Biceps and triceps are antagonistic muscles.When one contracts other relaxes.The contraction of biceps gets the radius,ulna closer to the scapula.This is called flexing.Contraction of triceps gets them apart and this called extension.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Will you be richer or poorer than your parents?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.