DNA is a polymer ( a large molecule that contains repeating units) composed of 2’ deoxyribose (a five-carbon sugar), phosphoric acid, and the four nitrogen containing bases denoted A, T, G and C. The chemical structures of the bases are
Chapter 5 : stem cells
What is a stem cell? Ultimately, every cell in the human body can be traced back to a fertilized egg that came into existence from the union of egg and sperm. But the body is made up of over hundreds
Chapter 4 : specific features of meiosis
Meiosis has three unique features : The mechanism of cell division varies in important details in different organism. This is particularly true of chromosomal separation mechanism, which differ substantially in protists and fungi from the process in plants and animals
Chapter 2 : Replication
1) Definition The DNA replication is one of the key mechanisms of cell cycle. It is a highly regulated biological process in which new synthesis and repair mechanisms ensure the integrity of the genome. S phase or replication phase follows
Chapter 1 : TRANSCRIPTION
The central dogma of molecular biology The central dogma is the classic sequence of events : DNA produces RNA by transcription and RNA produces proteins ( structural proteins and Enzymes ) by translation . Transcription: making of RNA (taking the