What molecule holds instructions for the synthesis of proteins and copies itself before cell division?Multiple ChoiceATP synthaseDNARNANADFAD

The Correct Answer

1. Identifying the Key Concept: The question is asking for the molecule that contains the genetic instructions for protein synthesis and replicates itself before cell division.

2. Analyzing Each Option:

   • ATP synthase: This is an enzyme that helps synthesize ATP (adenosine triphosphate) but does not hold genetic instructions.
   • DNA: Deoxyribonucleic acid (DNA) contains the genetic instructions for the development and function of living organisms. It also replicates itself during cell division.
   • RNA: Ribonucleic acid (RNA) is involved in protein synthesis but is generally synthesized from a DNA template and does not replicate itself in the same sense before cell division.
   • NAD: Nicotinamide adenine dinucleotide (NAD) is a coenzyme found in all living cells but does not hold genetic information.
   • FAD: Flavin adenine dinucleotide (FAD) is another coenzyme involved in various biological reactions but like NAD, it doesn't store genetic information.

3. Conclusion: Given that DNA is the only option that carries genetic instructions and replicates prior to cell division, it is the correct answer.

Final Answer

DNA is the molecule that holds instructions for the synthesis of proteins and copies itself before cell division.