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Biology AS Discuss problems!

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Hi guys I've been viewing a couple of threads and i got confused with all ALEVEL stuf mixed together discussions.AS and A2 have quite alot of difference and there must be separate threads.So please help me and yourself in this thread.Thank you
 
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sorry??? are u sure you're answering the correct question?? because its not about enzyme inhibition at all:/
 
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I am not sure but if we look at the table a particular sequence of lysosome peptide is given and the order of nucleotides in cì) is not in the same sequence and as far as we know varing the sequence will change the whole protein molecule thats why we will have a different sequence than cì) :( I'm not sure
 
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Because each amino acid has more than one triplet of codons, as shown in the figure, arg has 6 different codons, cys has 2 codons & glu has 2 codons as well. (64 triplets of codons are available for only 20 amino acids, so, logically, each amino acid will have more than 1 codon representing it).
Thanks bro but can u explain me how 64 triplets of codons are available for 20 aminoacids ?
 
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i didnt understand the answer of this question at all can any1 help me in this.its q25.....http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s09_qp_1.pdf
water is transported in the xylem and there are cohesion forces between water molecules and adhesive forces between cellulose cell wall and water so to maintain column of water and sustain the tension applied on the column of water the diameter must reduce.Whenever there is any reference to decrease in diameter only this logic applies.Hope u understand.
 
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water is transported in the xylem and there are cohesion forces between water molecules and adhesive forces between cellulose cell wall and water so to maintain column of water and sustain the tension applied on the column of water the diameter must reduce.Whenever there is any reference to decrease in diameter only this logic applies.Hope u understand.
thanks sameen yea i understood this finally! thanks alot :)
do share your problems too it will be useful
 
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Thanks bro but can u explain me how 64 triplets of codons are available for 20 aminoacids ?
The nitrogen containing bases in mRNA are 4 (A, U, G & C) each triplet contains 3 bases, so you can make 64 combinations with them (4^3= 64).
The total number of amino acids present in the human body is only 20 amino acids, so, the 64 triplets of codons represents those 20 amino acids only. :)
 
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for q 34 you need to put sth in mind while solving p1 questions which is choose the answer which is most likely the correct one as he always gets u two choices which are correct but one of them is closest to the answer... here A is the closest as immune response gets triggered whenever any of the t-lymphocytes or b-lymphocytes spots the graft tissue while they are circulating in the blood
 
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