Table of Contents
Is protoplasm a colloid?
Protoplasm is a colloidal solution. It is a general term used for the living substance of cells which is enclosed by the plasma membrane.
What is colloidal theory of protoplasm?
Protoplasm is the fundamental material of all living organisms. The colloidal theory of protoplasm was proposed by Fisher (1894) and Hardy (1899). According to them protoplasm is a heterogenous polyphasic colloidal system, which appears in different phases, like reticular, fibrillar, granular or alveolar.
Is cytoplasm a colloid?
The cytoplasm is that portion of the cell enclosed by the plasmalemma and excluding other membrane bound organelles. It is an aqueous colloidal liquid containing a multitude of metabolites. The cytoplasm contains a number of inclusions.
Why is it called colloid?
The term colloidal refers to a state of subdivision, implying that the molecules or polymolecular particles dispersed in a medium have at least in one direction a dimension roughly between 1 nm and 1μm, or that in system discontinuities is found at distances of that order.
What makes up the protoplasm of a cell?
The protoplasm is the living material of the cell. It is primarily composed of biomolecules like nucleic acids, proteins, lipids, and carbohydrates. It also holds inorganic salts and molecules of water. The protoplasm consists of two major divisions in eukaryotes: the cytoplasm, and the nucleoplasm (cell nucleus).
Is protoplasm a cytoplasm?
Protoplasm is physically translucent, granular slimy, semifluid or viscous. In eukaryotes, the portion of protoplasm surrounding the cell nucleus is known as the cytoplasm and the portion inside the nucleus as the nucleoplasm.
What is the function of protoplasm?
what is the function of protoplasm? Protoplasm contains the genetic material of a cell. It also controls the activity of the cell. The first component of the protoplasm is the cytoplasm, which in eukaryotes exists between the cell membrane and the nucleus.
What is colloidal theory?
A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance. A colloid has a dispersed phase (the suspended particles) and a continuous phase (the medium of suspension).
Who defined protoplasm?
Who coined the term protoplasm? J.E. Purkinje coined the term protoplasm.
Is blood a colloid?
Blood is a colloid because in blood the blood cell size is between 1nm to 100nm. A mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance. Blood is a colloidal solution of an albuminoid substance.
Why is colloid classified as a homogeneous mixture?
A colloid is a heterogeneous mixture in which the dispersed particles are intermediate in size between those of a solution and a suspension. Because the dispersed particles of a colloid are not as large as those of a suspension, they do not settle out upon standing. …
What is colloid short answer?
A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance.
What is the colloidal nature of protoplasm?
The colloidal nature of the protoplasm is chiefly due to the presence of gigantic protein molecules which often reach colloidal dimensions and are distributed throughout it. In fact, these macro-molecules of proteins constitute next major category of chemical substances after water in protoplasm.
Is protoplasm a solution or mixture?
Although a large number of chemical substances are found in the protoplasm with water constituting the major portion, the protoplasm is not a true solution. Most of the particulate phase of the protoplasm is colloidal in nature.
What is the cyclosis of protoplasm?
Due to the phase reversal property of the protoplasm, the intracellular streaming or movement of the protoplasm takes place. This property of intracellular movement of protoplasm is known as the cyclosis. The cyclosis usually occurs in the sol-phase of the protoplasm and is effected by the hydrostatic pressure, temperature, pH, viscosity, etc.
Who proposed protoplasm theory?
Schultze proposed protoplasm theory (name given by O. Hertwig). Max Schultze firstly told that protoplasm is physical basis of life. Rinke and Roderwald, 1881 first of all performed the chemical analysis of protoplasm. Several theories have been proposed to explain physical nature of protoplasm. (1) Alveolar theory – “Butschli” (1892).