Which of the following nucleic acid types encodes the amino acid sequence of a polypeptide?...

BIOLOGY
SAT 2021

Which of the following nucleic acid types encodes the amino acid sequence of a polypeptide?

  • A. rRNA
  • B. snRNA
  • C. DNA
  • D. mRNA

Correct Answer: D. mRNA

Explanation

mRNA, or messenger RNA, carries genetic information from DNA into a three-letter code that encodes the amino acid sequence of a polypeptide (protein). DNA contains the genetic instructions for structure and development of living things and stores genetic information over the long term. tRNA, or transfer RNA, brings amino acids to ribosomes during translation of RNA to protein. rRNA, or ribosomal RNA, is a component of ribosomes along with ribosomal proteins. Ribosomes are the cell organelles responsible for translating mRNA to protein. snRNA, or small nuclear RNA, forms complexes with proteins used in RNA processing. snRNA is found only in eukaryotes.

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