What can mRNA do that DNA cannot?

A. Copy itself

B. Leave the nucleus

C. Enter the nucleus

D. Leave the cell

Answer: B. Leave the nucleus

Explanation: DNA is a genetic material found in the nucleus of a cell. mRNA is made by copying the DNA in a complementary manner in a process called transcription. After mRNA is produced, it leaves the nucleus and moves to the ribosome where it is used to make polypeptide chains which are packaged into proteins in a process known as translation. DNA cannot leave the nucleus but an mRNA can.