cell biology Flashcards
What is a eukaryotic cell?
Animal and plant cells. They have a cell membrane, cytoplasm and a nucleus.
What is a prokaryotic cell?
Bacterial cells. They have a cell membrane, cell wall and a unenclosed genetic material. They may have smaller rings of DNA called plasmids, or tails called flagellum.
True or false: Eukaryotic cells are smaller than prokaryotic cells.
False, vice versa. Eukaryotic are measured in micrometres, prokaryotic are measured in nanometres.
What sub- cellular structures are found in animal cells?
Nucleus, mitochondria, ribosomes, cytoplasm and a cell membrane.
What sub- cellular structures are found in plant cells?
Nucleus, mitochondria, ribosomes, cytoplasm, a cell membrane, cell wall, chloroplasts, and a permanent vacuole.
What is the function of a nucleus?
Contains the genetic material.
What is the function of mitochondria?
Provides energy by carrying out respiration .
What is the function of ribosomes?
To carry out proteinsynthesis.
What is the function of cytoplasm?
Where most of the chemical reactions happen.
What is the function of a cell membrane?
Controls the movement of substances in and out of the cell.
What is the function of chloroplast?
Absorbs light for photosynthesis.
What is the function of a permanent vacuole?
Filled with cell sap to help keep the cell turgid.
What is the function of a cellulose cell wall?
Gives strength to the cell and supports the plant.
What is the function of plasmids?
Additional genetic materials.
What is the function of a flagellum?
A tail that helps the cell to move around.
How is a sperm cell specialised to carry out its function?
Has a tail for swimming to the ovum, packed full of mitochondria to provide energy, sperm head (acrosome) contains enzymes to help break into the ovum.
How is a nerve cell specialised to carry out its function?
Long thin axon allows nerve impulses to travel along the cell as it makes its way to and from the brain. Has many dendrites to pass nerve impulses to nearby nerve cells.
How is a muscle cell specialised to carry out its function?
Contract and relax as part of a muscle tissue, for movement. Packed full of mitochondria for energy.
How is a ovum cell specialised to carry out its function?
The cytoplasm contains nutrients and many mitochondria to provide energy for mitosis and fertilisation. Has a special cell membrane which allows only one sperm cell to fertilise it.
How is a root hair cell specialised to carry out its function?
Take up water and mineral ions for the plant. Long thin hair to increase the surface area over which water can be absorbed.