What is the direction of the flow of genetic information?

Question

BlackTom AI · Accepted Answer

Genetic information flows from DNA to mRNA to proteins — this is the central dogma of molecular biology.

1) Relevant knowledge points and concepts
- DNA stores hereditary information in the sequence of nucleotide bases.
- Transcription is the synthesis of messenger RNA (mRNA) using a DNA strand as a template (RNA polymerase catalyzes complementary base pairing; U in RNA pairs with A in DNA).
- Translation is the process by which the ribosome reads mRNA codons and assembles the corresponding amino acids into a polypeptide (the genetic code maps codons to amino acids).
- Replication copies DNA to DNA; reverse transcription (RNA → DNA) is an exception in some viruses but does not change the standard flow for most cellular systems.

2) Step-by-step reasoning
- Step 1 (DNA → mRNA, Transcription): A gene’s DNA sequence is read by RNA polymerase; complementary ribonucleotides are added to form pre-mRNA, which is processed (capping, splicing, polyadenylation in eukaryotes) to produce mature mRNA.
- Step 2 (mRNA → Protein, Translation): Ribosomes bind mRNA, read sequential three-base codons, and tRNAs bring amino acids matching each codon. Peptide bonds join amino acids into a polypeptide that folds into a functional protein.

3) Intermediate details (no numeric calculations)
- Example of base pairing during transcription: DNA template 3′-T A C-5′ → mRNA 5′-A U G-3′ (U replaces T in RNA); AUG codon codes for methionine to start translation.

4) Why the correct answer is correct
- Because genetic information is encoded in DNA, transcribed into an RNA message (mRNA), and then translated into proteins that perform cellular functions. That linear flow is DNA → mRNA → Proteins.

5) Why other options are incorrect
- a and d start with proteins as templates for nucleic acids, which is not how sequence information is copied. Proteins cannot serve as templates to create nucleic acids.
- b reverses the last two steps (DNA → Proteins → mRNA), implying proteins are made before mRNA or that proteins template mRNA, which is false.

Conclusion: The correct direction is DNA → mRNA → Proteins, matching option c.

What is the direction of the flow of genetic information?Single choice

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