plant cell ultra structure
Cards (3)
- chloroplasts
- double membrane
- have a fluid called stroma containing starch grains
- internal network of flattened discs on top of each other called grana individual discs are called thylakoids
- grana contain chlorophyll and joined by membranes called lamelle
- make their own proteins and contain own dna and ribosomes
- carry out photosynthesis
- cell wall
- surrounds cell membrane
- made from the carbohydrate cellulose
- freely permeable
- provides cell shape
- contents of cell press against cell wall making it rigid
- provides barrier for pathogens
- Vacuole
- membrane lined sac containing cell sap
- permanent feature
- membrane is called tonoplast and is selectivley permeable
- fills or loses water to maintain turgor