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