Question

which process is part of transcription?
dna is copied to create a second dna strand.
mrna codons and trna anticodons assemble amino acids.
dna is unzipped with the aid of dna polymerase.
mrna is synthesized from a strand of dna.

Explanation:

• Option 1: DNA being copied to create a second DNA strand is DNA replication, not transcription.
• Option 2: mRNA codons and tRNA anticodons assembling amino acids is part of translation (protein synthesis), not transcription.
• Option 3: DNA is unzipped with the aid of DNA polymerase in DNA replication. In transcription, RNA polymerase is involved in unzipping DNA (in prokaryotes, RNA polymerase can also unwind the DNA; in eukaryotes, other proteins help in DNA unwinding for transcription).
• Option 4: Transcription is the process where mRNA is synthesized from a strand of DNA. RNA polymerase reads the DNA template strand and synthesizes a complementary mRNA strand.

Answer:

mRNA is synthesized from a strand of DNA.