Which of the following molecules would coded for by the longest piece of DNA, assuming that no post-transcriptional RNA processing or splici

Question

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

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Maya 3 months 2022-02-13T08:02:03+00:00 2 Answers 0 views 0

Answers ( )

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    2022-02-13T08:03:42+00:00

    Answer: (A): A protein with 25 amino acids

    Explanation: Nucleotides are macromolecules composed ofa 5-carbon sugar (ribose), a nitrogenous base, and a phosphate group and represent the building blocks of both our DNA and RNA.

    Both codons and amino acids are built out of 3 nucleotides. Thus, 25 amino acids will yield 75 nucleotides whereas 20 codons only 60. In conclusion, the protein is coded from the longest piece of DNA.

    B has nothing to do with DNA or RNA coding.

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    2022-02-13T08:03:58+00:00

    Answer:

    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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45:5+15-5:5+20+17*12-15 = ? ( )