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What are cells?
- The basic structural and functional units of all life
- Average cell size is 0.1um
What does the cell theory propose?
- All living things consist of one or more organised structures at are called cells
- All living things are composed of one or more cells, and that new cells are produced from existing ones
Describe prokaryotic cells
- Have little defined internal structure
- No structure houses the DNA
- Eg. Bacteria
Describe Eukaryotic cells
- Complex internal structure
- Contain organelles
- Have a nucleus
- Organelles are held in place by the cytoskeleton
- eg. animals, fungi, protists, plants
What is the plasma membrane?
- Present in animals and plants
- It is a semi permeable boundary that controls the internal environment of the cell
What is the Cell wall?
- Present in all except animal cells
- Rigid protective structure outside of plasma membrane
- Made from carbohydrates (cellulose)
What is the Cytoplasm?
- The liquid where the organelles are found
- Where cellular metabolism occurs
What are organelles?
Membrane bound structures
Describe the nucleus
- Only found in eukaryotic cells
- Houses the DNA and is the control centre of the cell. Determines metabolic activity
- Covered by nuclear envelop (double layer membrane)
What is the mitochondrion?
- Found in Eukaryotic cells
- The site of cellular respiration, production of ATP (energy compound)
What are ribosomes?
- Site for protein synthesis
- Eukaryotic and Prokaryotic
- Attached to the Endoplasmic reticulum
What does the endoplasmic reticulum do?
Collects the protein synthesised by ribosomes for transport throughout the cell
What are lysosomes?
- A sac within cells containing digestive enzymes
- Can cause death of cell
- Responsible for destruction and digestion of unwanted material with the cell
What are chloroplasts responsible for?
- In plant cells
- Site of photosynthesis
- Contain chlorophyll (absorbs light)