Question

Which of the following represents the correct sequence of nucleic acids considering their decreasing molecular weight?

• A. DNA $\to$ mRNA $\to$ tRNA $\to$ rRNA
• B. DNA $\to$ mRNA $\to$ rRNA $\to$ tRNA
• C. DNA $\to$ rRNA $\to$ tRNA $\to$ mRNA
• D. DNA $\to$ tRNA $\to$ nRNA $\to$ rRNA

Answer 1

Answer: (B)

DNA $\to$ mRNA $\to$ rRNA $\to$ tRNA

• DNA is the genetic material present in the nucleus.
• This DNA is translated into RNA. RNA is generally of 3 types. mRNA, tRNA, and rRNA.
• The decreasing order of molecular weight is DNA $\to$ mRNA $\to$ rRNA $\to$ tRNA.
• DNA is the heaviest and tRNA is the lightest.
  Thus the correct answer is option B.