DNA/RNA

[Diana Timpano]

Hi....A couple of questions..help....

If a structural gene contains 300 DNA nucleotides, how many amino acids will be used in the protein synthesis process?

If a protein has 150 amino acids, how many DNA nucleotides would make up the structural gene?

[Arty]

Hi....A couple of questions..help....

If a structural gene contains 300 DNA nucleotides, how many amino acids will be used in the protein synthesis process?

If a protein has 150 amino acids, how many DNA nucleotides would make up the structural gene?

Pretty easy!!
No of amino acids= 300/3 = 100 amino acids
No of nucleotides= 150*3 = 450 nucleotides

[zami'87.]

Hi....A couple of questions..help....

If a structural gene contains 300 DNA nucleotides, how many amino acids will be used in the protein synthesis process?

If a protein has 150 amino acids, how many DNA nucleotides would make up the structural gene?

Pretty easy!!
No of amino acids= 300/3 = 100 amino acids
No of nucleotides= 150*3 = 450 nucleotides

if we don't go in details(stop codon...)?

[biostudent84]

448 maximum if you include the start codon and stop codons.

[canalon]

448 maximum if you include the start codon and stop codons.

I think if you really want to count stop codons (start codons are transcribed) you get these results
(300 nt - 1 non transcribed stop codon)= 99 aa
and (150aa + 1 non transcribed stop codon)x3= 453nt

Patrick

[biostudent84]

What are the "n" and the "t" meaning in this example?

[canalon]

What are the "n" and the "t" meaning in this example?

oopps "nt" stands for nucleotides (bases) as "aa" stands for amino acids.

Patrick

[biostudent84]

I'd like to know where I got that number from and what the heck I was thinking.....

98 maximum if you count the start and stop codons.

Sorry.....

[canalon]

I'd like to know where I got that number from and what the heck I was thinking.....

98 maximum if you count the start and stop codons.

Sorry.....

Start codons ARE transcribed, hence 99.

[biostudent84]

They are? Thanks

[MrMistery]

From what i know, start codons are transcripted, but if your protein does not begin with metionin then it is later removed

[cytochromeP]

r we forgetting something...
Oh yes...INTRONS
if the structural gene contains introns then the no. of aa reqd. for protein making is indeterminate !
or else if its a bacterial gene then my predecessors have already done the math.