Evolution: Theories of origin of life and evidence of evolution
The origin of life on Earth and evolution are closely connected, as one explains how life began and the other explains how it changed over […]
Articles by Sushil Humagain
Semi-conservative DNA Replication
Introduction DNA is only one type of genetic information that is carried by humans and other living things. The bases of the DNA known as […]
Meiotic cell division (Meiosis), its stages and significance
What is meiosis? The term meiosis is derived from the Greek word ‘meioum’ which means to reduce. It is a special kind of cell division, […]
Mitotic cell division (Mitosis), its stages and Significance
What is cell division? Life of multicellular organisms starts from a single cell known as a zygote. An adult plant or animal contains millions of […]
Artificial kidneys: Hemodialysis therapy
If the kidneys fail, toxic substances build up in the body until cells and organs begin to deteriorate and eventually die. Many tens of thousands […]
How is Kidney (Renal) transplantation done?
Grafting a kidney from a compatible donor to restore kidney functions in a recipient suffering from kidney failure is called kidney transplantation. It is also […]
Differences between Agnatha and Gnathostomata
S.N. Agnatha Gnathostomata 1. Mouth is circular without jaws. Mouth is provided with jaws. 2. Paired appendages are lacking. Paired appendages are present, may be […]
Excretory System in a Frog
Kidney is the most important excretory organ of frog. Frog mainly excretes urea, ammonia and water. In tadpole, kidney is pronephric but in adult kidney […]
The Arterial system in human beings
The blood vessels which carry oxygenated blood away from the heart and supply blood to various body parts collectively constitute the arterial system. The major […]
Nitrogen fixation, its types and mechanism
What is nitrogen fixation? The phenomenon of conversion of free nitrogen into nitrogenous salts to make it available for absorption by plants is called nitrogen […]