biology

What is archaea?

Prokaryotic cell is one of the simplest forms of cell which makes up the unicellular microscopic organisms called acrhaea and bacteria. However, there are some cyanobacteria which are multicellular.

More advanced and developed than the prokaryotic cell, eukaryotic cells are those which have true or membrane-bound nucleus along with other nucleus bound cell organelles. From unicellular organisms like protozoa and amoeba, all plants and animals, including human beings are made up of eukaryotic cells.

Eukaryotic cell are the developed, advanced and complex forms of cells. They are the building block or smallest unit of life of organisms as simple as amoeba and protozoa to the most complicated plants and animals. Significantly bigger than the prokaryotic cells, eukaryotic cells have diameter ranging from 10µm -100µm. Inside it are various cell organelles which performs individual functions and support cell life.

Prokaryotic cells are the earliest forms of lives on the earth and simples cells which evolved nearly 3.5 billion years ago. Almost 1.5 billion later, more advanced and complex cells called eukaryotic cells evolved which make up superior organisms such as plants and animals.

The study of bone is known as Osteology. The bone connective tissue is highly calcified, solid, hard, rigid connective tissue. The matrix consists of an organic component called ossein. It is the major component of adult vertebrate endoskeleton.

Blood corpuscles (blood cells)

This tissue is mesodermal in origin. It is the most abundant body tissue. The cells forming the connective tissues are more widely separated from each other than those forming the epithelium and intracellular substance. It has few cells, an extensive matrix and a rich blood supply.

Mitosis cell division is the type of cell division cycle in which chromosomes in a cell nucleus are separated into two identical sets of chromosomes, each in its own nucleus.