Which of the following molecules would coded for by the longest piece of dna, assuming that no post-transcriptional rna processing or splicing has occurred?

(a): a protein with 25 amino acids
(b): a polysaccharide with 60 sugars
(c): a mrna molecule with 20 codons
(d): an mrna molecule with 45 nucleotides

A protein with 25 amino acids coded for by the longest piece of DNA, assuming that no post-transcriptional RNA processing or splicing has occurred.

The correct option is Option A i.e. A protein with 25 amino acids.

Explanation:

A codon is a "group of three nucleotides" on mRNA which codes a "particular amino acid" during the protein translation. Whereas nucleotide is a group of a pentose sugar, a nitrogen base, and a phosphate moiety.

A RNA molecule with 20 codons have 20*3=60 nucleotides. A protein with 25 amino acids will be coded by 25*3=75 nucleotides. So option A is correct. Option B i.e. Polysaccharide has no relation with nucleotides.

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