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    Does anyone have any predictions for tomorrows exam? Like what experiment might come up?
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    (Original post by Komol)
    Can anyone give me the ans of how molecule of mRNA is made during transcription (4 marks) thanks😊

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    Transcription takes place in the nucleus of a cell.

    DNA is unzipped by DNA helicase, by breaking the H bonds between the strands.

    Free RNA nucleotides in the nucleus line up along the template/antisense strand, following the complimentary base pairing rule. (over here you can also mention which nitrogen base binds to which)

    RNA polymerase enzyme forms the sugar phosphate backbone, by forming phosphodiester bonds, as a result of condensation reaction.

    mRNA then leaves the nucleus, and DNA ligase joins the DNA strands back together.

    Hope that helps!
    Anyone if i missed anything pls do let me know!!
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    (Original post by Nethmioysters)
    Transcription takes place in the nucleus of a cell.

    DNA is unzipped by DNA helicase, by breaking the H bonds between the strands.

    Free RNA nucleotides in the nucleus line up along the template/antisense strand, following the complimentary base pairing rule. (over here you can also mention which nitrogen base binds to which)

    RNA polymerase enzyme forms the sugar phosphate backbone, by forming phosphodiester bonds, as a result of condensation reaction.

    mRNA then leaves the nucleus, and DNA ligase joins the DNA strands back together.

    Hope that helps!
    Anyone if i missed anything pls do let me know!!
    Thanks that's a lot info

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    can someone pls describe the three-dimensional (tertiary) structure of an enzyme!? (3 marks)
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    (Original post by Komol)
    Can anyone give me the ans of how molecule of mRNA is made during transcription (4 marks) thanks😊

    Posted from TSR Mobile
    Transcription takes place in the nucleus of the cell. Here DNA unwinds and hydrogen bonds between bases break. A strand is used as a template (antisense strand) for the synthesis of mRNA. Free RNA mono nucleotides pair up due to complementary base pairing and the enzyme RNA polymerase joins of the mono nucleotides to form a strand of mRNA. This then moves out of the nucleus through the nuclear envelope and into the cytoplasm where translation begins...

    anyone have anything to add? I think that should be enough for 4 marks
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    (Original post by Nethmioysters)
    can someone pls describe the three-dimensional (tertiary) structure of an enzyme!? (3 marks)
    An enzyme's tertiary structure is the further folding of the enzyme to give it its 3D structure

    Bonds are formed between the R groups of the amino acids (e.g. hydrogen, ionic and disulphide bridges).

    The formation of the active site allows the enzyme to bind to a specific substrate molecule to catalyse a reaction.
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    (Original post by perez_perez)
    Transcription takes place in the nucleus of the cell. Here DNA unwinds and hydrogen bonds between bases break. A strand is used as a template (antisense strand) for the synthesis of mRNA. Free RNA mono nucleotides pair up due to complementary base pairing and the enzyme RNA polymerase joins of the mono nucleotides to form a strand of mRNA. This then moves out of the nucleus through the nuclear envelope and into the cytoplasm where translation begins...

    anyone have anything to add? I think that should be enough for 4 marks
    That must be 4 marks.

    Only thing to add is its helicase that causes the enzyme to unwind
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    Is this thread for those resitting or for the new spec?
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    (Original post by Excuse Me!)
    Is this thread for those resitting or for the new spec?
    This thread is for the old spec. Most people on here are probably resitters but I'm doing the full A-Level of biology this year for the first time.
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    (Original post by perez_perez)
    An enzyme's tertiary structure is the further folding of the enzyme to give it its 3D structure

    Bonds are formed between the R groups of the amino acids (e.g. hydrogen, ionic and disulphide bridges).

    The formation of the active site allows the enzyme to bind to a specific substrate molecule to catalyse a reaction.
    Thanks alot!
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    Name:  12.PNG
Views: 205
Size:  12.4 KBAttachment 538481538483

    could someone explain the circled bit
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    (Original post by mh99)
    Name:  12.PNG
Views: 205
Size:  12.4 KBAttachment 538481538483

    could someone explain the circled bit
    Glucose and Galactose has the formula
    C6 H12 O6
    So when it is simplified it is :
    C1 H2 O1
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    (Original post by NNB_Herath)
    Glucose and Galactose has the formula
    C6 H12 O6
    So when it is simplified it is :
    C1 H2 O1
    okay thanks
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    I would say don't predict what is going to come up.. Know them all lol


    I know them all but hate the enzyme one 😁
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    Good luck guys :crossedf:
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    (Original post by Nethmioysters)
    wow there were so many questions straight from past papers.
    How difficult was it?was there any weird question?
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    (Original post by Nethmioysters)
    nope no weird questions. most of them quite straightforward. but the mcqs were quite tricky
    What came up?
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    (Original post by Nethmioysters)
    nope no weird questions. most of them quite straightforward. but the mcqs were quite tricky
    Were the questions about experiment straight forward as well??
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    Easy paper I guess
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    How did everyone do?
 
 
 
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