B1 Cells Flashcards
Organisms are made of _______.
cells
What cell structures are unique to plants instead of animals?
cell wall
chloroplasts
vacuole
cytoplasm
Jelly-like, with particles and organelles in it.
Cell membrane
A partially permeable layer that forms a boundary around the cytoplasm.
Prevents cell contents from escaping an and controls what substances enter and leave the cell.
nucleus
A circular or oval structure containing DNA in the form of chromosomes.
Controls cell division, development and activities.
cell wall (plants)
A tough, non-living layer made of cellulose surrounding the cell membrane.
Prevents plant cells from bursting and allows water and salts to pass through (freely permeable).
Vacuole (plants)
A fluid-filled space surrounded by a membrane.
contains salts and sugars and helps to keep plant cells firm.
Chloroplasts (plant)
An organelle containing chlorophyll.
Traps light energy for photosynthesis.
Formula for magnification
M = I/A
Formula for actual size
A = I/A
Formula for image size
I = AxM
Root hair cell
Absorb water and minerals from the soil.
The hair-like projection on each cell penetrates between the soil particles and offers a large absorption surface. The cell membrane is able to control which dissolved substances enter the cell.
Palisade Mesophyll Cell
These are found underneath the upper epidermis of the plant leaves. They are columnar, long and packed with chloroplasts to trap light energy. Their function is to make food for the plant by photosynthesis using carbon dioxide, water and light energy.
Red Blood Cells
These cells are distinctive because they have no nucleus when mature. They are tiny disc-like biconcave cells which contain a red pigment called haemoglobin. This readily combines with oxygen and their function is the transport of oxygen around the body.
