Amino Acids
Apr/100
How many amino acids are there in DNA during transcription?
How many nitrogenous bases does it take to code for a protein?
Each group of 3 nitrogenous bases that codes for an amino acids is called a.?
Give me an example ?
There are some mistake above in the answer of previous writer. Protein can't be made of two amino acids, as proteins are the sufficiently long chain of amino acids. They, in human usually act as enzymes and may contain up to even several hundreds amino acid units. THEY are POLYPEPTYDES.
But, your question is entirely different.
How many amino acids there are in transcription- depends on how many amino acids the DNA replication started WITH.
But the most important thing you must remember is replication always take place in between 5 prim(5') and 3' in the template (DNA) strand , and there may be as many amino acids as it's necessary to produce a required protein.
Late I will give you a few example. But before please follow a few things-
CODON--> (Triplets) made of 3 nitrogenous bases, denoting one amino acids.
e.g. for Alanine --> GCU,GCC,GCA,GCG.
Glycine--> GGU,GGC,GGA, GGG
( see a "m-RNA amino acid table" in any genetics book))
There are 64 possible combinations BUT, among them...
3 following are STOP codons and 1 is just a initiating codon
a. STOP codons--> UAA, UAG, UGA ( stops adding further aminoacids to the template strand)
b. Methionine ( AUG)--> starts synthesis.
The number of amino acids forming a protein is always initiated and limited by these above codons and strictly takes place in a DNA template strand and nextly m-RNA strand IN BETWEEN
3'....................................................................5'
Let's see an example:
SINGLE TRANSRIPTION UNIT
5' ATGCCGTGGATATTTCTTTTATATTAG 3'--> DNA coding
strand
5' TACGGCACCTATAAAGAAAATATAATC 3' --> tepml. str.
TRANSCRIPTION
5' AUGCCGUGGAUAUUUCUUUUAUAUUAG 3'--> mRNA
MET, Ala, Try, Iso, Phe, Leu, leu, Tyr, STOP = protein
TRANSLATION
5' START........ 7 amino acids.............. STOP synthesis 3'
ANSWER--> You can now count the no. of nitrogenenous base in the above example.
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