Question

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

Explanation:

Transcription is the process where DNA is used as a template to synthesize mRNA. Let's analyze each option:

• "mRNA is synthesized from a strand of DNA" matches transcription (RNA polymerase uses DNA template to make mRNA).
• "DNA is unzipped with the aid of DNA polymerase" is incorrect (DNA polymerase is for replication, helicase unzips DNA; also, transcription uses RNA polymerase for unzipping and synthesis).
• "DNA is copied to create a second DNA strand" is DNA replication, not transcription.
• "mRNA codons and tRNA anticodons assemble amino acids" is translation (protein synthesis from mRNA).

Answer:

The correct statement is "mRNA is synthesized from a strand of DNA" (the first option).