Question

when mrna leaves the nucleus, it ________. enters a mitochondria binds to a ribosome fuses with the plasma or cell membrane

Explanation:

mRNA (messenger RNA) is involved in protein - synthesis. After leaving the nucleus where it is transcribed from DNA, it travels to the ribosomes in the cytoplasm for translation into proteins. It does not enter mitochondria, nor does it fuse with the plasma membrane.

Answer:

binds to a ribosome