Molecular Biology Review
It can be useful, though not accurate, to think about gene expression as a 1:1:1 ratio between genes:transcripts:proteins.
- Protein Isoforms
- Different forms of proteins produced by the same gene.
- One genes can produce many different types of proteins.
- Transcription-Factor Proteins A Form of Gene Regulation
- Binds to the DNA close to the site of another gene and makes it easier or harder for mRNA to be produced from that other gene.
- Nucleotide
- A base attached to a sugar and phosphate(s).
DNA
A nucleic acid, made up of nucleotides. Double stranded.
Four Bases
Sequences of base pairs encode information. Possible for there to be a pair mismatch, though rare.
- AC Base Pair
-
Adenine
Thymine
- CG Base Pair
-
Cytosine
Guanine
Transcription
DNA is read by RNA Polymerase into mRNA.
mRNA is complementary to the DNA being read (with Thymine swapped with Uracil).
- Coding Strand
- The strand that the mRNA matches (with T -> U).
- Template Strand
- The strand that RNA Polymerase reads to form the compliment of.
mRNA
A nucleic acid, made up of nucleotides. Usually single stranded.
Four Bases
- AU Base Pair
-
Adenine
Uracil
- CG Base Pair
-
Cytosine
Guanine
Translation
Amino Acids Codon Chart
mRNA > Amino Acids > Proteins.
mRNA sequence can be thought of in triplets, where a triplet of nucleotides is called a codon.
Proteins
A chain of amino acids is folded together to produce the final protein structure.
Epigenetics
Ways DNA can be regulated based on the 3D structure of the DNA. Useful for cell differentiation from stem cell.