Protein synthesis occurs in two stages. During transcription,
is generated from a template strand of
This takes place in the
of the cell. The transcribed molecule is then translated into
a
by

The answers to the blank spaces are as follows:

Gene expression is the process whereby the gene is used to synthesize proteins. It is made up of two processes as follows:

Learn more about gene expression at: link

mRNA, DNA, Nucleus, protein, ribosome

Explanation:

mRNA is a messenger RNA which is produced during transcription by using a template strand of DNA in the nucleus. The mRNA is then translated into protein by ribosome of the cell. This whole concept is part of the Central Dogma of Life.