DNA's Role in Genetic Information and Protein Production

Steps:

• Recall that DNA is the molecule storing genetic instructions in living organisms.
• Understand that these instructions direct cellular functions, primarily through coding for proteins.
• Evaluate choices: A relates to nutrition, not DNA; C to mutation rates, a side effect; D to reproduction, influenced but not primarily controlled by DNA.
• Confirm B matches DNA's central dogma: DNA to RNA to proteins.

Why B is correct:

• DNA's primary function is to carry genetic code that dictates protein synthesis, as per the central dogma of molecular biology, where genes on DNA are transcribed to mRNA and translated into proteins essential for cell structure and function.

Why the others are wrong:

• A: Nutrient absorption is regulated by proteins and cellular processes, not directly by DNA.
• C: Mutation rates are influenced by environmental factors and DNA repair, not controlled by DNA itself.
• D: Reproduction rates depend on hormones and environmental cues, with DNA providing blueprints but not direct control.

Final answer: B