Question

Where might a point mutation substitution have NO effect?

		before the stop codon
		in the mitochodrion
		in the start codon
		in an intron region

Which statement about protein manufacture is TRUE

		proteins are assembled in the nucleus
		each codon consists of 3 nucleotides
		DO NOT GRADE
		bacteria cannot manufacture proteins
		each codon can code for multiple amino acids

Answer 1

ANSWER :

Introns are non-coding sequence of DNA, which can't be translated to a functional protein or amino acids. Hence a point mutation substitution occurs in these region of DNA base sequence would not have any effect on protein synthesis.

The process of protein synthesis occurs in the cytoplasm of both prokaryotic and eukaryotic cells. Each genetic codon consists of three specific nucleotide base which codes for a specific amino acid during translation. Hence option (2) is the correct answer choice.