, (a) Levels of Organisation
2.1 Levels of organisation
Definition Example
Organelle Smallest function of a cell that carries out a specific task; they are not living Mitochondria
Cell Basic functional and structural units that can be classed a being alive Eukaryotic
Tissue A group of the cells with a similar structure that work together for a common Muscle tissue
function Nervous tissue
Glandular tissue
Organ A group of different tissues working together to perform a particular function Liver
Organ system A group of organs with related functions working together to perform a particular Digestive system
function
Organism A group of organ systems working together to form a complete individual sunflower
(b) Cell Structure
2.2/3 Cell structures
https://www.youtube.com/watch?v=qHkUOlC8Nbo
Organelle Function Found In
Nucleus Controls the cell activities e.g. cell division Animal / plant
Contains genetic material
Chloroplasts Contain chlorophyll to photosynthesis Plant
Chlorophyll pigments absorb sunlight
Mitochondria Site of aerobic respiration, producing energy for the cell Animal / plant
Cells with high rates of metabolism will have more mitochondria
Ribosomes Protein synthesis Animal / plant /
Found on a structure called rough endoplasmic reticulum bacteria
Cell wall Hold cell together and keeps its structure Plant / bacteria
2.1 Levels of organisation
Definition Example
Organelle Smallest function of a cell that carries out a specific task; they are not living Mitochondria
Cell Basic functional and structural units that can be classed a being alive Eukaryotic
Tissue A group of the cells with a similar structure that work together for a common Muscle tissue
function Nervous tissue
Glandular tissue
Organ A group of different tissues working together to perform a particular function Liver
Organ system A group of organs with related functions working together to perform a particular Digestive system
function
Organism A group of organ systems working together to form a complete individual sunflower
(b) Cell Structure
2.2/3 Cell structures
https://www.youtube.com/watch?v=qHkUOlC8Nbo
Organelle Function Found In
Nucleus Controls the cell activities e.g. cell division Animal / plant
Contains genetic material
Chloroplasts Contain chlorophyll to photosynthesis Plant
Chlorophyll pigments absorb sunlight
Mitochondria Site of aerobic respiration, producing energy for the cell Animal / plant
Cells with high rates of metabolism will have more mitochondria
Ribosomes Protein synthesis Animal / plant /
Found on a structure called rough endoplasmic reticulum bacteria
Cell wall Hold cell together and keeps its structure Plant / bacteria
