Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Explain Cell - The Basic Unit of Life
You must be aware of the fact that the cell is the basic unit of life. What do you understand by the term 'cell'? What are the components of the cell, its structural features and functions that make it such an essential component of all the living beings? Well, here in this section, we shall study about all these aspects related to cell. What would be the answer to the question what is a cell? Well, a cell is the smallest self-functioning unit found in all the living organisms. Cells may exist as independent units of life (as in monads) or may form colonies or tissues as in the higher plants and animals. Each cell is enclosed by an outer membrane or wall called as the cell membrane. A cell has receptors on its surface which have unique functions and identifying properties. Also, it contains genetic material (DNA) and other parts to carry out its life functions. Within the cell are the nucleus and the cytoplasm. The nucleus contains the genetic material-DNA.
The cytoplasm contains organelles that carry out the cell's functions. We shall read about these components of the cell in a little while from now. An aggregation of cells having a common origin and performing a similar but one or more specific functions in the body constitute a tissue (e.g. muscle). Several types of tissues may join collectively to form an organ that carries out one or more specific functions (e.g., kidney, liver, leaf and roots). In majority of animals, several organs are interrelated to perform a specific function within a multicellular organism and thus constitute an organ-system.
We will learn about this organ systems i.e. gastrointestinal system, renal system in the subsequent units. You would realize that several types of organ-systems in the body of an organism show unique example of division of labor. It is important to note that the cells are not only the building blocks of the body, but are the functional unit of life too. Every cell arises from pre-existing cells. The cells have the same genetic material. It is, therefore, capable of giving rise to a new individual. This potential of the cell to give rise to unlike cells and so to develop a new organism or a part is termed as totipotency. Interestingly, all the activities of an organism are present in miniature form in each and every cell. Therefore, the cell can be called as a basic unit of life and the structural unit of an organism. 'All organisms are composed of cells'. 'All cells come from pre- existing cells'. These two statements constitute the cell theory.
i need help
1. Contrast how a functionalist verses a conflict theorist would view the impact and effects of the media on children differently? Be sure to articulate the point of view of e
What ways can igneous rock form two ways? Igneous rocks are formed when melted material crystallizes, e.g. from magma.
what is the mode of feeding of a lion
Explain the Factors Controlling Movements of Gall Bladder Contraction of gall bladder can be controlled by reflex action, by the presence of foodstuff in the duodenum and by th
As glaciers erode the surface over which they move, sets of parallel linear grooves are sometime worn into the rock surface. These grooves are known as: Striations
Eye Injuries : The eyes are a particularly vulnerable part of your body. Safety glasses, goggles or a face shield are a 'must' for any experiment where there is any , danger of sp
what is ecology
RADIATION HAZARDS : We are sure that you would have studied about electromagnetic radiation during your studies at the school. You would recall that in electromagnetic radiatio
The Ayurvedic System of Medicine: Punarvasu Atreya (about 6th century B.C.) taught medicine at Taxila. Each of his disciples such as Bhela, Jatukarna, Harita, Ksarapani, Par
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd