As biology unit 1 21/5/2014 panic thread Watch

mr osaka
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#121
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#121
(Original post by trialbyc0mbat)
dont you mean U replaces T? :confused:
yes U replaces T,, i dont know about replacing G
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mr osaka
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guys how's it all going ? are u done studying and solving? how ready do u think u r for the exams ? what r ur doubts? im so nervous
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mr osaka
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(Original post by fictioned)
Go through past papers.
There is a pattern in the questions actually

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dude will u say what pattern u r talking about ?
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Alnassenigzig
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#124
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(Original post by Husain J.)
Uracil replaces Thymine mate, not Guanine
Oh crap! my bad ,sorry!
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HQazi
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I'm not sure if its the same as DNA helicase but polymerase is in electrophoresis (A2, dont' worry )
So to avoid confusion, I'd just say helicase

Hope this helps
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HQazi
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Remember key terms definitions; how to draw molecules of amino acid, triglyceride and glucose; also bonds!

These are easy marks I wish everyone very best of luck
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Catb97
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(Original post by Katiekatie1)
Hey guys, what is DNA polymerase used for? Is it the same as DNA helicase?
I think it's used to form the bonds between mononucleotides - as in vertically, when DNA replication is occuring - same as mRNA polymerase
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aliali8
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Guys can someone explain CFTR and how a mutation causes thick mucus.
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Catb97
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What is the difference between a point mutation and a chromosomal mutation anyone?
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Catb97
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(Original post by mr osaka)
dude will u say what pattern u r talking about ?
There is a pattern in the core practical questions - well as in no two the same have come up two years in a row - i reckon either enzymes or beetroot should come up this time, and definitely not vit c
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Alnassenigzig
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(Original post by Catb97)
What is the difference between a point mutation and a chromosomal mutation anyone?
Point mutation is caused by miscopying of just one or a small number of nucleotides.
Chromosomal mutations :involves changes in the number or position of genes with the chromosomes
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fictioned
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You just said what I was gonna say.

I am sorry, I couldn't tell you earlier, my mom took my phone away so that I study

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HQazi
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(Original post by Catb97)
There is a pattern in the core practical questions - well as in no two the same have come up two years in a row - i reckon either enzymes or beetroot should come up this time, and definitely not vit c
I think beetroot one is likely to come up.
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fictioned
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I am doing Daphnia and the beetroot one.

Both are idk, seems worthy?

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gabriella2193
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#135
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please please please can someone give me a brief explanation of transcription and translation?
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myrmeco12
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Hi guys, quick question, main differences between fibrinogen and fibrin? I am aware that fibrinogen is an insoluble substance whilst fibrin is soluble but I believe there are a few other differences?

Thanks in advance!
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fictioned
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Fibrin is a fibrous protein while fibrinogen is a globular protein

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crazzysashgirl
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(Original post by myrmeco12)
Hi guys, quick question, main differences between fibrinogen and fibrin? I am aware that fibrinogen is an insoluble substance whilst fibrin is soluble but I believe there are a few other differences?

Thanks in advance!
fibrinogen - soluble, tertiary, compact
fibrin - insolube, secondary structure

nd so d same points as in for d comparison of globular proteins n fibrous proteins
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N.Choi
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(Original post by gabriella2193)
please please please can someone give me a brief explanation of transcription and translation?
Transcription (in nucleus):
  • Double helix unwinds and hydrogen bonds break between bases
  • One strand is used as a template to make mRNA.
  • Free RNA line up along this template strand called the antisense by complementary base pairing.
  • RNA polymerase binds the RNA bases together
  • 3 adjacent mRNA bases forms a codon


Translation (in cytoplasm)
  • mRNA moves out of nuclear pores and onto ribosomes
  • a tRNA moves into the mRNA. A tRNA consists of three bases called an anticodon and it has an amino acid too
  • The anticodon binds with codon by complementary base pairing
  • When there are two tRNA lining up, the two amino acids join together by peptide bonds


Thats all
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Alnassenigzig
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(Original post by aliali8)
Guys can someone explain CFTR and how a mutation causes thick mucus.
I'm also feeling uneasy about this question,im going to attempt to answer it ,and someone please correct me if im wrong,here it goes
A mutation of the gene or the genes that code for CFTR protein structure hindering its function.
Chloride ions build up in their cells instead of moving out through the CFTR channels and as a result water does not move out to their dilute the mucus on the surface of the membrane.Thus water moves back into cells by osmosis making mucus stickier and thicker
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