Q. Consider the following statements:
1.microRNA (miRNA) and messenger RNA (mRNA) are made from the same basic chemical components.
2.The mRNA is used to build the carbohydrates.
3.mRNAs have a greater length compared to the shorter miRNAs.
Which of the statements given above are correct?
Explanations –
Statements 1 and 3 are correct. Both miRNAs and mRNAs are made of ribonucleic acid (RNA) and composed of the same four nitrogenous bases: adenine (A), guanine (G), cytosine (C), and uracil (U). mRNAs are significantly longer, ranging from hundreds to thousands of bases, while miRNAs are typically around 20-22 bases long. mRNA serves as a messenger that carries genetic instructions from DNA to the ribosomes, the cell’s protein-making machinery. It tells the ribosomes which proteins to make and in what order. miRNAs are small RNA molecules that regulate gene expression. They do this by binding to mRNAs and either blocking their translation into proteins or marking them for destruction.
Statement 2 is incorrect. mRNA carries genetic information from DNA to ribosomes for protein synthesis and is not involved in carbohydrate synthesis.
Source: The Hindu
