DNA's Role in Genetic Information

Steps:

• Recall that DNA is the molecule storing genetic instructions in living organisms.
• Understand that these instructions direct cellular processes, primarily through gene expression.
• Recognize that gene expression involves transcription of DNA to mRNA and translation to proteins.
• Identify that protein production is the core function, as proteins perform most cellular tasks.

Why B is correct:

• DNA's primary function is to encode genetic information that guides protein synthesis, as per the central dogma of molecular biology (DNA → RNA → protein).

Why the others are wrong:

• A: Nutrient absorption is handled by cellular structures like the digestive system, not DNA.
• C: Mutation rate is influenced by environmental factors and repair mechanisms, not directly controlled by DNA.
• D: Reproduction rate depends on hormones and environmental cues, not DNA's primary role.

Final answer: B