Bilogy — Introduction to Genetic Information Flow + 5 more topics

You've probably heard of DNA, RNA, and proteins, but how do they all connect? The Central Dogma of Molecular Biology describes the fundamental flow of genetic information within a biological system. It basically states that information usually moves from DNA to RNA to protein.

Let's break down each step:

You know that DNA contains all the instructions for building and operating a cell. But these instructions (genes) are locked away in the nucleus. Proteins, which do most of the cell's work, are made outside the nucleus in the cytoplasm. Transcription is the process that bridges this gap, creating a portable copy of a gene's instructions.

The main players here are:
* mRNA (messenger RNA): This molecule carries the genetic code from the DNA in the nucleus to the ribosomes in the cytoplasm. It's essentially the instruction manual for building a specific protein.
* Ribosomes: These are complex cellular machines made of ribosomal RNA (rRNA) and proteins. They act as the workbench where translation occurs. They have binding sites for mRNA and tRNA.
* tRNA (transfer RNA): These small RNA molecules are like adapter molecules. Each tRNA carries a specific amino acid at one end and has a three-base sequence called an anticodon at the other end. The anticodon pairs up with a complementary codon on the mRNA.
* Amino Acids: These are the building blocks of proteins. There are 20 common types.