Question

Which of the following statements are not correct ?
• [A.] Each DNA strand could act as a template for production of new complementary strand
• [B.] Change in one or more base pairs do not alter the encoded information
• [C.] Replication is the process of protein synthesis
• [D.] The sugar molecule in RNA is deoxyribose
Choose the correct answer from the options given below :

• A. A, B and D only
• B. A, C and D only
• C. B, C and D only
• D. A and B only

Hint:

DNA replication produces identical DNA molecules, while protein synthesis occurs through transcription and translation. RNA contains ribose sugar, not deoxyribose.

Answer 1

The Correct Option is C

Concept: DNA and RNA are fundamental genetic materials responsible for:
• Storage of hereditary information,
• Replication,
• Protein synthesis,
• Transmission of genetic traits. Understanding molecular genetics requires knowledge of:
• DNA replication,
• Mutation,
• RNA structure,
• Gene expression.

Step 1: Analyzing Statement A. Statement A says: \[ \text{Each DNA strand could act as a template for production of new complementary strand} \] This statement is correct. According to the semi-conservative model of DNA replication:
• Each parental DNA strand acts as a template,
• Complementary nucleotides are added,
• Two daughter DNA molecules are produced. Therefore: \[ A = \text{Correct} \] Hence, it is NOT included among incorrect statements.

Step 2: Analyzing Statement B. Statement B says: \[ \text{Change in one or more base pairs do not alter encoded information} \] This statement is incorrect. Changes in base pairs are called mutations and may:
• Alter codons,
• Change amino acid sequences,
• Affect protein synthesis,
• Produce genetic disorders. Therefore: \[ B = \text{Incorrect} \]

Step 3: Analyzing Statement C. Statement C says: \[ \text{Replication is the process of protein synthesis} \] This is incorrect. Replication refers to: \[ \text{Copying of DNA} \] Protein synthesis involves:
• Transcription,
• Translation. Thus: \[ C = \text{Incorrect} \]

Step 4: Analyzing Statement D. Statement D states: \[ \text{The sugar molecule in RNA is deoxyribose} \] This is incorrect. RNA contains: \[ \boxed{\text{Ribose sugar}} \] while DNA contains: \[ \boxed{\text{Deoxyribose sugar}} \] Hence: \[ D = \text{Incorrect} \]

Step 5: Determining the incorrect statements. Incorrect statements are: \[ B, C, D \] Therefore, the correct answer is: \[ \boxed{\text{(C) B, C and D only}} \]