Category Archives: School

Difference between Mitosis and Meiosis

By | September 9, 2021

Cell happen to be fundamental unit of life. New cells will arise from existing cells. A cell will divide to give rise to two cells and these two cells can form four cells and so on. This is termed as “Cell reproduction” or “Cell division“. Cell division usually occur by Mitosis or Meiosis . Following… Read More »

What is Meiosis?

By | September 8, 2021

In the previous posts we looked into eukaryotic cell division (Mitosis) and its regulation at checkpoints. Today we will discuss about another important type of cell division called as Meiosis. Introduction : Meiosis is a special kind of cell division that occur in germ cells of sexually reproducing organisms, where it reduces the chromosome number… Read More »

Cell cycle checkpoints and regulation

By | September 7, 2021

Cell cycle can be defined as a ordered and highly regulated sequence of events required for cell division. The cell cycle can be divided into four phase for understanding purpose (as cell cycle is a continuous ongoing process) – Gap 1 (G1), synthesis (S), Gap 2 (G2) and mitosis (M), During these phases a cell… Read More »

Cell cycle and Cell division

By | August 31, 2021

All the living organisms, even the enormous ones, start their journey from a single cell. The process through which cells originate from existing living cells is called as cell division. Each cell have the ability to divide into two daughters cells (In mitosis), which again can grow and divide. This after many cycles (of growth… Read More »

Five and three domain classification of living organisms

By | August 24, 2021

Our Earth exhibits a large variety of living organisms, be it different kinds of plants, insects, sea creatures or other animals. In addition to these living forms, there are many organisms which we cannot see with our naked eye but are present around us. There are an estimated 1.5 – 1.7 million named species on… Read More »

The Nucleus of a Eukaryotic Cell and Chromatin Organization

By | August 20, 2021

The nucleus of a eukaryotic cell is essential for the storage and utilization of genetic information. The contents of the nucleus are enclosed by a complex nuclear envelope that separates the nucleus from the cytoplasm. The nucleus of a non-mitotic cell contains: Chromosomes, highly extended nucleoprotein fibers, also called chromatin. An irregularly shaped electron-dense structure,… Read More »

What are prokaryotes ?

By | August 18, 2021

All the living organisms on this planet are made up of cells. They can be divided into two groups : Prokaryotes and Eukaryotes. Prokaryotes are single celled or colonial organisms, where the cell is surrounded by cell membrane or plasma membrane and lacks a defined nucleus (as found in eukaryotic cell). These cells are of… Read More »

4 major Biological Macromolecules – Fueling Life

By | July 27, 2021

Everything on this Earth – living and non-living, is made up of atoms. An atom is the smallest unit of matter that has the characteristic properties of a chemical element. Two or more different or similar atoms will combine to form “Molecules” with the help of chemical bonds. Many molecules, joined together in an organized manner… Read More »

Lysosomes – Digestive Organelle of an Animal Cell

By | July 27, 2021

A lysosome has approximately 50 different hydrolytic enzymes. These enzymes are produced by the endoplasmic reticulum and targeted lysosomes. Lysosome enzymes can digest every type of biological macromolecule. All the enzymes of the lysosome share significant properties – their optical activity at an acid pH and thus are acid hydrolases. The pH optimum of these… Read More »

Golgi Complex – The Protein Assembly Center of the Cell

By | July 26, 2021

The Golgi complex has a characteristic morphology – flattened, disklike, membranous cisternae with dilated rims, and associated tubules. The cisternae have a diameter of 0.5 to 1 micrometer, stacked in an ordered manner and a Golgi stack contains fewer than eight cisternae. There are several thousand distinct types of stacks depending on the cell type.… Read More »