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Are all proteins enzymes?

How enzymes works? And translation of proteins.?

  • Explain how (i) competitive and (ii) non competitive inhibitors of enzymes work (8 marks) Briefly describe the process of translation of RNA to protein (10 marks)

  • Answer:

    I'll just add onto zindagi's answer for the first question. Competitive inhibitors block the active site of an enzyme, preventing the enzyme from acting on a substrate (the substance being acted on by the enzyme). When a substrate comes along, they won't bind because the active site of the enzyme is already filled. Non-competitive inhibitors don't act on the active site. When they join onto the enzyme, the tertiary structure of the enzyme is distorted, thus changing the shape of the active site of the enzyme. When a substrate comes along to bind, it's shape will no longer fit that of the active site. Here's a good animation: http://www.youtube.com/watch?v=PILzvT3spCQ These kinds of inhibitions are sometimes considered in the designing of drugs (rational drug design). If you block the active site of an enzyme, products won't be formed and further down the track, the virus cannot replicate.

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can explain the 2nd one not the frst .. !! haven't done that .. i hope it caters .. =] frstly we start wit the mRNA which the gene codes of .. this will act as a guideline of as to where the and which proteins will be brought and synthesized .. it has an initiation site where the process stats secondly we need to know about tRNA (transfer RNA) - as significant as it is very functional has 2 parts the anti codon and the amino acid carrying part .. the anti codon is complementary to the mRNA template thirdly the ribosome - it is responsible for making the protein using the above 2 .. now fr the process .. 1)the ribosomes assembles at the start site ... 2) now a starter is required for the translation soo.. we have AUG (methionine) which starts the process .. 3)the next codon invites its complementary tRNA which has the complementary anti codon .. 4) it enters the ribosome and the met transfers to the next tRNA .. which moves forward .. 5) the next tRNA comes and the 2 amino acids transfer themselves from the prev tRNA to the one inside the ribosome ,.. 6) this process continious till we get a long protein .. 7)then a release factor enters the ribosome and stops the process .... the protein is released and translation complete .. any issues use youtube .. !! here a vid i refferd to .. http://www.youtube.com/watch?v=5bLEDd-PSTQ hope you understood ! =) cheeers !!

zindagi rocks

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