2. PROTOPLASM AND THE CELL.doc - PROTOPLASM AND THE CELL...

This preview shows page 1 - 3 out of 7 pages.

PROTOPLASM AND THE CELLPROTOPLASMDescribed as the “physical basis of life”, general term for the living substanceIncludes the cytoplasm and nucleus of the cellOrganized aggregate of colloids, crystalloids, dissolved gasses and other minute particles dispersed in an aqueousmedium and endowed with lifeHas vital properties which includes irritability, motility, metabolism, growth and reproductionPhysical appearanceTranslucent, viscous, gelatinous, semi fluid substance similar to the albumin of an eggBelieved to be a colloidal system capable of changing its state from a watery solution to a gel-like colloidMay appear homogenous (hyaline), granular, alveolar or reticular and fibrillarHomogenous – as seen in the exoplasm of the amoebaGranular – as seen in young and undifferentiated cells(immature cells)Reticular – fine lattice like appearanceFibrillar – appearance of fine fibrilChemical componentWater75% water; Partly free and available as a solvent for metabolic processesPartly bound to protein as a structural componentMost abundant elements includes oxygen, hydrogen, carbon and nitrogenAlso contains proteins, nucleic acids, carbohydrates, lipids and inorganic materialsProteinConstitutes more than half of the dry weight of the cellDetermines the shape and the structure of the cellMay exist as pure protein or combined with lipids or with carbohydrate to form glycoprotein,proteoglycan or mucoproteinOther types of proteins includes enzymes and hormonesNucleic acidsDNA- Genetic material found mainly in the nucleusRNA - Present both in the nucleus and the cytoplasm; carries message from the nucleus to thecytoplasm & serve as a template for the synthesis of proteins.
CarbohydratesProvides the chief source of energy of most cells in the form of glucose and glycogen which is thestorage form of glucoseLipidsMajor component of the membrane system of the cellCan also serve as an energy source for the cellInorganic materialK, Na, Ca, Mg, Cl, P, S and FeMinerals found in trace includes Mn, Cu, Zn, Co, I, Br, and FlResponsible for the following

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 7 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Spring
Professor
N/A

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture