Which occurs during 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.

Answer; mRNA is synthesized from a strand of DNADuring transcription mRNA is synthesized from a strand of DNA. Explanation; Transcription is the process that takes place in the nucleus of a cell, where DNA molecules acts as a primer to synthesis messenger RNA, catalyzed by the enzyme RNA polymerase. It is the first step of expression of gene, a particular segment of DNA is copied to mRNA by RNA polymerase. Then the mRNA is transported to the cytoplasm for the process of translation in which proteins are formed.

mRNA is synthesised from a strand of DNA. this messengerRNA then carries the section of code from the DNA to a ribosome where it is transcribed into a protein.