Which of the following best describes the what happens during gene expression?
A. A single gene leaves the nucleus of a cell and travels through the cytoplasm to the membrane.
B. The nucleus of a cell builds cellular proteins based on the sequence of the mRNA code.
C. A gene is copied many times so that all of a cell’s daughter cells will have their own copy.
D. A cell reads the instructions in DNA and builds a protein based on those instructions.