biology

• cells

  there are two types of cells - eukaryotic and prokaryotic cells
• eukaryotic cells are larger than prokaryotic cells and their dna is contained in a nucleus
• most eukaryotic cells are part of a complex multicellular organism containing a range of specialised cells that perform a variety of functions
• organisms are made up of organ systems which contain organs working together to perform a function
• organs are made up of a range of tissues that work together to perform a function
• specialised cells with similar structures and functions are organised into tissues
• animals, plants and fungi are all examples of eukaryotic organisms
• eukaryotic cells contain a range of organelles such as cell-surface membrane, nucleus, mitochondria, chloroplasts, ribosomes, cell wall and cell vacuole
• cell structure includes : chloroplast,ribosomes,nucleus,mitochondria,cell wall
• diffusion is the movement of molecules from the area of high concentration of the molecules to an area of low concentration
• osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration
• animal cells 


  animal cells have a basic structure, including: cell membrane, cytoplasm,nucleus,ribosomes and mitochondria
• cytoplasm 


  contains dissolved nutrients and structures called organelles, it is where many of the chemical reactions happen
• nucleus 


  contains genetic material, including DNA, which contains the cell’s activities
• cell membrane 


  the structure is permeable to some substances, but not to others. it. controls the movement of substances in and out of the cell