Cell membrane

  • the semipermeable membrane surrounding the cytoplasm of a cell.

cell wall

  • a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants, it consists mainly of cellulose


  • The material or protoplasm within a living cell, excluding the nucleus.


  • The central and most important part of an object, movement, or group, forming the basis for its activity and growth.

Nuclear memebrane

  • A nuclear membrane, also known as the nuclear envelope, nucleolemma or karyotheca, is the double lipid bilayer membrane which surrounds the genetic material and nucleolus in eukaryotic cells.


  • A small dense spherical structure in the nucleus of a cell during interphase.


  • A minute cylindrical organelle near the nucleus in animal cells.

  • Occurring in pairs and involved in the development of spindle fibers in cell division.


  • Material of which the chromosomes of organisms other than bacteria (eukaryotic) are composed. It consists of protein, RNA, and DNA.


  • Ribosomes are protein builders or protein synthesizers

Gologi apparatus

Complex of vesicles and folded membranes with the cytoplasm of most eukaryotic cells.

Endoplasmic reticulum

A network of membranes found throughout the cell and connected to the nucleus.


  • An organelle found in large numbers in most cells
    It has a double membrane, the inner layer being folded inward to form layers.


  • A plastid that contains chlorophyll and in which photosynthesis takes place


  • an organelle in the cytoplasm of eukaryotic cells containing degradative enzymes enclosed in a membrane.


  • A small organelle that is present in the cytoplasm of many cells and that contains the reducing enzyme catalase and usually some oxidases.


  • a sA A small cavity or space in tissue, especially in nervous tissue as the result of disease.



  • A microscopic network of protein filaments and tubules in the cytoplasm of many living cells, giving them shape and coherence.