Cell theory, Biology

Assignment Help:

Cell Theory

The term cell was first used by an English cytologist, Robert Hooke (1665) not for unit protoplasmic masses, but for the well defined and empty compartments, he observed in a thin slice of cork under his self invented   microscope. This finding of Hooke was cork is a dead and dry plant material. Obviously, what Hooke actually   observed were empty cells with cellulose walls originally produced by the living cells they surrounded, yet the term cell has since been retained and universally adopted for unit protoplasmic masses of live organisms.

Leeuwenhoek (1674-76) discovered free living cells. He also observed the presence of a distinct central structure in certain unicellular organisms and some cells of multicellular organisms.  Robert brown (1831) discovered that a central structure is an essential is an essential part of all living cells. He named it as nucleus first observed the jelly like protoplasm in living   cells and termed it arcade. When observation upon varied types of cells and unicellular organisms many scientists during17th and 18th centuries were leading to the realization that plants and animals were made up of component cells. Two German biology Matthias j Schleiden and Theodor Schwann (1938-39) separately formulated. Famous cell theory stating that cells are the basic structural and functional unit or building blocks of the bodies of all organisms, like the bricks of house. Thus this cell theory came as the most fundamental biological generalization implying a common pattern of body architecture in all living beings. 


Related Discussions:- Cell theory

Differentiate between sterilization and disinfection, Q. Differentiate betw...

Q. Differentiate between sterilization and disinfection? 1) Sterilization is defined as freeing the object or substance from all life of any kind. It is the process by which a

Illustrate fluoxetine is an antidepressant drug or not, Fluoxetine is an an...

Fluoxetine is an antidepressant drug that presents an action mechanism related to the synaptic transmission. What is that mechanism? Fluoxetine is a substance that inhibits th

Explain the donnan membrane equilibrium, Explain the Donnan Membrane Equili...

Explain the Donnan Membrane Equilibrium? If one of the solutions in a two-phase membrane equilibrium contains certain charged solute species that are unable to pass through the

Roles of abscisic acid, Roles of Abscisic Acid Abscisic acid (ABA) is ...

Roles of Abscisic Acid Abscisic acid (ABA) is a particularly interesting hormone with regard to the regulation of its own levels. Its levels rise and fall dramatically in seve

Hirschsprungs disease, Hirschsprungs Disease (Congenital Megacolon): T...

Hirschsprungs Disease (Congenital Megacolon): This  is also known as congenital megacolon. There is absence of ganglion cells, submucus plexus  and intramural plexus  (parasym

Digestive system - liver, LIVE R (HEPAR) - Largest gland of body. W...

LIVE R (HEPAR) - Largest gland of body. Weighing 1.6 kg. Form 1/40 of the body weight. Bio-chemical laboratory. Bussiest part in whole river of life. Dark reddish brown

Classification of living beings, Q. What is the Biology field that studies ...

Q. What is the Biology field that studies the classification of living beings? The Biology field that studies the classification of living beings is termed as Taxonomy. Q.

Define the effect of dietary fibre on satiety, Define the effect of Dietary...

Define the effect of Dietary fibre on Satiety? Satiety: Several investigators have speculated that ingestion of a high fibre food induces a feeling of satiety, reduces meal siz

Absorbing surface of the small intestine is increased, State three ways in ...

State three ways in which the absorbing surface of the small intestine is increased.   The absorbing surface of the small intestine is increased by:- (a) being very long

Explain about conjugated proteins, Conjugated Proteins Conjugated prote...

Conjugated Proteins Conjugated proteins are composed of easy proteins combined with a non- proteinous substance.  The non-proteinous substance is known as prosthetic group o

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd