Vesicles and Vacuoles
Vesicles- membrane- bound sacs found in cells- used to carry many different substances around cells.
Plant cells- large VACUOLE needed to maintain cell stability
- filled with water
- pushes the CYTOPLASM against the cell wall
- TURGID- caused by the water pushing the CYTOPLASM agains the CELL WALL
- Turgidity- helps support the plant
Plant cell walls
Plant cell walls are:
- Outside of the plant cell plasma membranes
- Plants- made of cellulose- CARBOHYDRATE POLYMER made up of GLUCOSE subunits
- Cellulose- forms a sieve like NETWORK of strands- makes the wall strong
- Held rigid- by PRESSURE of the fluid inside the cell (turgor pressure)- supports the cell, and effectively the whole plant
- Largest organelle
- When stained- dark patches named CHROMATIN
- Surrounded by a NUCLEUR ENVELOPE
- Has a dense, spherical structure called the NUCLEOLUS inside the nucleus
WHAT IS A NUCLEUR ENVELOPE?
A stucture made of 2 membranes with fluid between them.
Nuclear pores that pass through- relatively large molecules can pass through