question_answer

  Plasma membrane is made up of which two   components? *-ENTER_NEXT_LINE*   What is hypotonic solution? *-ENTER_NEXT_LINE*   What is hypertonic solution?

Answer:

                Plasma membrane is made up of lipids and proteins. *-ENTER_NEXT_LINE*                   A solution having solute concentration lower than that of the cell sap is call hypotonic solution. *-ENTER_NEXT_LINE*                   A solution having solute concentration higher than that of the cell sap called hypertonic solution. *-ENTER_NEXT_LINE*                   A solution having solute concentration same as that of the cell sap is call isotonic solution. *-ENTER_NEXT_LINE*                   Cell wall is made up of cellulose. *-ENTER_NEXT_LINE*                   Amoeba, Bacteria, Paramecium. (Any one) *-ENTER_NEXT_LINE*                   Fungi, plants, animals. (Any one) *-ENTER_NEXT_LINE*                   The diffusion of water or solvent through a semipermeable membrane from a solution of lower concentration of solutes to a solution of higher concentration of solutes is called osmosis. *-ENTER_NEXT_LINE*                   The movement of molecules across a membrane in cells against concentration gradient with the help of ATP units is called active transport. *-ENTER_NEXT_LINE*      Plastids and mitochondria. *-ENTER_NEXT_LINE*                   Lysosomes are known as 'suicidal bags' because when cell gets damaged due to disturbance in cellular metabolism, lysosomes may burst and the digest enzymes thus released digest their own cell. *-ENTER_NEXT_LINE*                   Ribosomes present in the cell synthesise proteins and are called protein factories of the cell. These may be attached on the surface of rough endoplasmic reticulum or lie freely in the cell. *-ENTER_NEXT_LINE*                   Lysosome.                            *-ENTER_NEXT_LINE*                                           Endocytosis is the ingestion of material by folding of the membrane around it for its engulfment as seen in Amoeba.        *-ENTER_NEXT_LINE*                                        Genes are located on chromosomes in the nucleus. *-ENTER_NEXT_LINE*                   Cell wall and chloroplast. *-ENTER_NEXT_LINE*                   Lysosomes and centrioles. *-ENTER_NEXT_LINE*                   Golgi apparatus. *-ENTER_NEXT_LINE*                   Plasma membrane. *-ENTER_NEXT_LINE*                   Cell wall. *-ENTER_NEXT_LINE*                   Vacuoles. *-ENTER_NEXT_LINE*                   Endoplasmic reticulum. *-ENTER_NEXT_LINE*                   Microscope is an optical instrument consisting of a lens or combination of lenses which renders minute objects distinctly visible. *-ENTER_NEXT_LINE*                   Light microscope is called a compound microscope because it consists of two or more lens systems. *-ENTER_NEXT_LINE*                   Nucleolus. *-ENTER_NEXT_LINE*                   Chromosomes are made up of DNA and protein. *-ENTER_NEXT_LINE*                   It is the shrinkage of cytoplasm away from cell membrane when kept in a hypertonic medium. *-ENTER_NEXT_LINE*                   The undefined nuclear region of prokaryotes is known as nucleoid. *-ENTER_NEXT_LINE*                   Mitochondria and plasmids contain DNA. *-ENTER_NEXT_LINE*                   Ribosomes. *-ENTER_NEXT_LINE*                   Viruses. *-ENTER_NEXT_LINE*                   Peroxisome. *-ENTER_NEXT_LINE*                   Ribosome. *-ENTER_NEXT_LINE*                   Movement of molecules from a region of their high concentration to a region of their low concentration is called diffusion. *-ENTER_NEXT_LINE*                   For endocytosis to occur, the outermost membrane should be flexible. But in plant cells, cell wall is the outermost membrane which is very rigid. Hence, no endocytosis occurs in plants. *-ENTER_NEXT_LINE*                   Nucleus, also known as the brain of the cell, controls most of the activities of the cell because it contains DNA (Deoxyribonucleic acid) which contains all the information of the cell.