Cells

• Cell membrane only allows small molecules to pass through, but not the larger molecules, hence controlling the substance entering and leaving the cell
• Cytoplasm is a site where most cell activities take place
• Nucleus controls activities in the cell and contains DNA that can be passed on from one generation to another generation
• cell wall protects the cell from injuries and give the cell a regular shape
• rough endoplasmic reticulum transport proteins to the Golgi apparatus for secretion out of the cell
• smooth endoplasmic reticulum synthesize fats and steroids, involved in detoxification of metabolic waste and drugs
• Golgi apparatus modify substances that were synthesize by the endoplasmic reticulum and stores and package these substances in the vesicles for secretion out of the cell
• mitochondria is a site where organic food substances like glucose is oxidise by the enzymes during aerobic respiration for cellular activities
• Chlorophyll is a green pigment that absorbs light energy for photosynthesis
• chloroplast is a site of photosynthesis
• animal cell have small numerous temporary vacuole contains water and food substances
• plant cell have one large central vacuole contains cell sap
• red blood cell contains haemoglobin to transport oxygen from lungs to the rest of the body
• muscle cell will contract and relax for movement
• root hair cell absorb water and dissolved mineral salts from the soil