what are cells?
cells are build blocks for living things
- The larger the organism the more cells it would have
- Cells are realy small and can only be seen in a microscope
what is a microscope?
A microscope is a instrument used to see small things
An animal celll contains 5 feature these are:
Nucleus:A large substance in the cell which contain the chromosomes made out of DNA.The nucleus also controls the activities of the cell and how it develops.
Cytoplasm:A jelly like substance in the cell containing many chemicals. this is were the chemical recations occure
Ribosomes:A BALL like stubstance found in the cytoplasm. This is were proteins are made.
Mitochondria:a rod-shaped subtance found in the cytoplacm. rhis releases energy from sugar through aerobic respiration
Cell membrane: A thin layer around the the cell.this controls the movements of substances in and outof the cell
Plant cells have the exact same fetures as a animal cell. Except they have three more. These are:
Cell wall: A rigid layer around the cell made out of cellulose which is strong and supports the cell
Chloroplast: A disc like substance found in the cytoplasm.they contain green pigments of chlorophyl which trap light energy for photosynthesis
Permenant vacuole: fluid-fuild cavity.This fluid is called: Cell sap. The sap supports the cell
Bacteria:single celled orrganisms which dont have an enclosed nucleus
- bacteria cells are reall small
- you cant see them without a microscope
bacteria are some times good for us but sometimes the cause problems example:
- pros: cons :
- make food for us they cause problems such as diseases
- break down wast
- a bacteria cell contains:
DNA LOOP:these are stands of DNA which control the cell as there is no nucleus in a bacteria cell
- Cell wall
- Cell membrane
Capsul: a slimy layer around the cell wall that protects the cell example antibiotics
Fungi are single celled organisms
They include:mushrooms,mould, and yeast. yeast are commercially useful. they are used in making bread and beers.
you can see fungal cells using light microscopes
fungal cells contain:
- plasmid/vacule:contain exstra genetic information
- cell membrane, and wall but the wall is madee out of chitin in stead of cellulose