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    (Original post by Mushi123)
    Itts the opposite actually! In primary they are arranged in a parallel manner and in secondary they are arranged in a criss cross manner coz it gives more strength! I saw this in a mark scheme so i am pretty sure :3
    Okay my text book says primary is arranged in a criss cross manner and secondary is laid down in sheets in which the microfibrils run in one direction.
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    When we are writing answers, are we allowed to use the short form for rough endoplasmic reticulum? rER? Case it would actually save some time
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    Posted from TSR Mobile
    Writw thw first time then put next to it (rEr) and then if you write again on the same answer write rer instead
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    Just did the exam, how did it go for everyone?


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    When can we discuss?
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    We can discuss now all ial papers have same time
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    How do you measure biodiversity?
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    (Original post by shariqsss)
    How do you measure biodiversity?
    Measure species richness using quadrats and genetic diversity.


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    Please don't discuss now many schools postpone the exams and some people have clashes so they do the exam later in the day so discuss in 2 hours

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    PM me please.
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    (Original post by sara_ara98)
    Please don't discuss now many schools postpone the exams and some people have clashes so they do the exam later in the day so discuss in 2 hours

    Posted from TSR Mobile
    Exactly. It's not worth taking the risk
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    what did you guys get for the % answer?
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    (Original post by Sal296)
    what did you guys get for the % answer?
    350%
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    and what did you guys write for the paper published to be declined by the scientific community?
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    (Original post by Sal296)
    and what did you guys write for the paper published to be declined by the scientific community?
    my answer was quite vague for this, I said because scientists need to have statistical data and proof + a detailed method of the investigation so it can be carried out and repeated and this paper lacked all these things, also wrote a bit about ethical issues - mice cannot give consent
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    (Original post by AJC1997)
    350%
    77.7%
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    (Original post by Pablomenlopez)
    77.7%
    didn't it increase from 0.20 to 0.90?

    ((0.9 - 0.2) / 0.2)) x 100 = 350%

    edit: woops meant x100
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    what about that 2 mark question on why differentiated cells cant form stem cells?
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    (Original post by Sal296)
    what about that 2 mark question on why differentiated cells cant form stem cells?
    this one was asking why it was difficult to turn specialised cells back into unspecialised stem cells right?

    I said it's difficult because activated genes would have to be deactivated which doesn't happen naturally like the reverse process of specialisation does, so it requires other force to 'undifferentiate' the cell which can be expensive and time consuming as it's very difficult to reverse specialisation
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    (Original post by AJC1997)
    this one was asking why it was difficult to turn specialised cells back into unspecialised stem cells right?

    I said it's difficult because activated genes would have to be deactivated which doesn't happen naturally like the reverse process of specialisation does, so it requires other force to 'undifferentiate' the cell which can be expensive and time consuming as it's very difficult to reverse specialisation
    YAY! i wrote the same.
 
 
 
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