What are the functions of each of the cells major organelles?
Chromosomes – Usually in the form of chromatin – Contains genetic information – Composed of DNA – Thicken for cellular division – Set number per species (i.e. 23 pairs for human) Nuclear membrane Nuclear membrane – Surrounds nucleus – Composed of two layers – Numerous openings for nuclear traffic Nucleolus Nucleolus – Spherical shape – Visible when cell is not dividing – Contains RNA for protein manufacture 2 * Collective term for cytosol and organelles contained within * Colloidal suspension * Cytosol mainly composed of water with free-floating molecules * Viscosity constantly changes Centrioles Centrioles – Paired cylindrical organelles near nucleus – Composed of nine tubes, each with three tubules – Involved in cellular division – Lie at right angles to each other Chloroplasts Chloroplasts – A plastid usually found in plant cells – Contain green chlorophyll where photosynthesis takes place Cytoskeleton Cytoskeleton – Composed of microtubules – Supports cell and provides shape – Aids
