Which of the following statements concerning transcription is true?
A. All types of RNA in the cell are synthesized by transcription, which uses a portion of DNA as a template for copying.
B. Promoter sequences signal the end of a gene and mark the place where transcription stops.
C. During transcription, entire chromosomes are copied because the starting position of genes is unknown.
D. Transcription is the process whereby identical copies of DNA are made in preparation for cell division.