AP BIOLOGY

Detailed explanation-1: -Repressors are regulatory proteins that prevent transcription by impeding the progress of RNA polymerase along the DNA strand so the DNA cannot be transcribed to mRNA. Figure 6.7.

Detailed explanation-2: -Gene expression is the process by which the information encoded in a gene is turned into a function. This mostly occurs via the transcription of RNA molecules that code for proteins or non-coding RNA molecules that serve other functions.

Detailed explanation-3: -This is carried out by an enzyme? called RNA polymerase which uses available bases from the nucleus? of the cell to form the mRNA.

Detailed explanation-4: -Even though nearly every cell in an organism’s body contains the same set of genes, only a fraction of these genes are used in any given cell at any given time.