The website has the complete lesson note for all the subjects in secondary school but this piece showcases the SS1 Biology Lesson Note on Description and Function of Cell Components. You can use the website search button to filter out the subject of interest to you.
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DESCRIPTION AND FUNCTION OF CELL COMPONENTS
Cell wall
Description: Non-living, made of cellulose, permeable to water and substance
Functions: Provides rigidity to the cell and gives it a definite shape.
Cell membrane
Description: Living and differentially permeable to water and substance.
Function: Allows selective movement of materials in and out of the cell.
Cytoplasm:
Description: Semi-fluid mass enclosed within the cell membrane and contain many organelles.
Functions: The largest and liquid part of the cell in which metabolic reactions occur.
Nucleus
Description: Enclosed by a nuclear membrane, and contains chromatin and nucleolus.
Functions: It stores and carries hereditary information from generation to generation. It also translates genetic information into the kind of protein characteristic of the cell. It controls the cell’s life processes
Vacuoles
Description: This is the fluid filled spaces in the cytoplasm.
Functions: Help in maintaining turgidity in the plant cell.
Mitochondria
Description: It is a double membrane system, found in all cells. It contains the enzymes for cellular respiration.
Functions: it carries out metabolism for all life processes. Kreb’s cycle and electron transfer system take place in the mitochondria.
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