RNA polymerase builds mRNA molecules through base pairing. If the DNA nucleotide is a C, the polymerase will add a G to the RNA (and similarly, a A to a T). RNA polymerase always builds RNA from the 5' to 3' position.

RNA Polymerase

The function of the nucleus is to store the genetic blueprint in order to make proteins during transcription and translation. The nucleus is enclosed by the nuclear envelope that acts as protection for the nucleus. The nucleolus which produces ribosomes to conduct protein production is also within the nucleus. 

Nucleus

The process of copying a gene's DNA sequence to make a single-stranded messenger RNA (mRNA) molecule in the nucleus. The process of transcription is mainly performed by RNA polymerases, an enzyme that matches the correct RNA nucleotide with the template strand. After transcription, mRNA molecules are sliced (resulting in variability in mRNA generated from the same DNA sequence) and stabilized with a 5' guanine cap and poly-A tail. 

University of California, Berkeley

- Transcription 
- Translation
- Replication

The Central Dogma of Life

https://www.khanacademy.org/science/biology/gene-expression-central-dogma/transcription-of-dna-into-rna/a/overview-of-transcription

Overview of Transcription

Transcription

During Translation, a ribosome "reads" the mRNA, which encodes for a peptide, which will then fold into a protein or a subunit of a whole protein. Every three nucleotides on a mRNA form a codon and each codon has a corresponding amino acid. Transfer RNA brings the amino acids to the ribosome and mRNA complex and peptide bonds form between the amino acids, resulting in a single peptide. This process takes place in the cytoplasm or the rough endoplasmic reticulum. 

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