What are Genes?
A gene is a basic unit of heredity in a living organism that ordinarily resides in long strands of Dna called chromosomes. Genes are coded instructions that decree what the organism is like, how it behaves in its environment and how it survives. They hold the information to build and profess an organism's cells and pass genetic traits to offspring. A gene consists of a long combination of four different nucleotide bases namely adenine, cytosine, guanine and thymine. All living things depend on genes as they specify all proteins and functional Rna chains.
What are Proteins?
Proteins are large, complex molecules that play many principal roles in the body. They are principal for construction the structural components of the human body, such as muscles and organs. Proteins also decree how the organism looks, how well its body metabolises food or fights infection and sometimes even how it behaves. Proteins are chains of chemical construction blocks called amino acids. A protein may include a few amino acids or it could have some thousands. The size of a protein is an foremost corporeal characteristic that provides beneficial information together with changes in conformation, aggregation state and denaturation. Protein scientists often use particle size analysers in their studies to discuss protein size or molecular weight.
Archibald Garrod
Archibald Garrod was one of the first scientists to recommend that genes controlled the function of proteins. In 1902, he published his observations regarding patients whose urine turned black. This health known as alkaptonuria happens when there is a buildup of the chemical homogentisate, which causes the darkening of urine. In most situations, excess amounts of amino acid phenylalanine are metabolised by the body. This led Garrod to infer that the enzyme responsible for its breakdown must be defective in these patients. In addition, since the black urine phenotype was passed from generation to generation in a quarterly pattern, Garrod reasoned that a gene had to be responsible for the production of the defective enzyme. He attributed a defective enzyme to a defective gene, suggesting a direct link in the middle of genes and proteins.
The connection in the middle of Genes and Proteins
Most genes include the information wish to make proteins. The journey from gene to protein is one that is complex and controlled within each cell and it consists of two major steps - transcription and translation. Together, these two steps are known as gene expression.
Transcription: information stored in a gene's Dna is transferred to a similar molecule called Rna in the cell nucleus. Although both Dna and Rna are made up of a chain of nucleotide bases, they have slightly different chemical properties. The type of Rna that contains the information needed to make protein is called a messenger Rna or mRna and it carries the message from the Dna out of the nucleus into the cytoplasm.
Translation: This is the second step in the production of proteins and it takes place in the cytoplasm. The mRna interacts with a specialised complex known as a ribosome that reads the sequence of the mRna bases. Each sequence has three bases called a codon, which codes for one single amino acid. A change Rna or tRna assembles the protein, one amino acid at a time. This continues until the ribosome meets a "stop" codon. The characterisation of different proteins can be conducted by Size Exclusion Chromatography as this technique can be used characterise molecular weight, structure and aggregation state.
