Question

Given below are two statements:
Statement (I): DNA, RNA and proteins are micromolecules.
Statement (II): Nucleotide and amino acids are monomers of DNA/RNA and proteins, respectively.
In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement (I) and Statement (II) are correct.
• B. Both Statement (I) and Statement (II) are incorrect.
• C. Statement (I) is correct but Statement (II) is incorrect.
• D. Statement (I) is incorrect but Statement (II) is correct.

Hint:

Remember that polymers (like proteins and nucleic acids) are always macromolecules, whereas their individual building blocks (monomers like amino acids and nucleotides) are micromolecules.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Biomolecules are divided into two categories based on their molecular weight and complexity: micromolecules (small biomolecules) and macromolecules (complex biopolymers).
Macromolecules are larger polymers formed by linking smaller monomeric units together.

Step 2: Detailed Explanation:
Statement (I) asserts that DNA, RNA, and proteins are micromolecules.
This is scientifically incorrect.
DNA (Deoxyribonucleic Acid), RNA (Ribonucleic Acid), and proteins have very high molecular weights (often exceeding several thousand Daltons) and are classified as macromolecules.
Micromolecules typically have molecular weights under 1000 Daltons and include simple sugars, amino acids, and nucleotides.
Statement (II) states that nucleotides and amino acids are the monomers of DNA/RNA and proteins, respectively.
This is correct.
Nucleic acids (DNA and RNA) are polymers made up of repeating nucleotide units linked by phosphodiester bonds.
Proteins are polypeptide chains formed by peptide bonds between amino acid monomers.
Thus, Statement (I) is incorrect, while Statement (II) is correct.

Step 3: Final Answer:
Therefore, Statement (I) is incorrect but Statement (II) is correct.