Biology

• What does the nucleus do?

  The nucleus contains the cell's genetic material and controls the cell's activities.
• What does the mitochondria do?

  Energy production
• What does the cell membrane do?

  Controls what goes in and out of cell
• What does the cell wall do?

  Gives the cell structure and strength (plants only)
• What does cytoplasm do?

  A watery, jelly-like mixture that contains many smaller parts where the work of the cell takes place
• What does the vacuole do?

  Stores wastes or chemicals (storage)
• What does ribosome do?

  Grows protein that we use to grow and repair our bodies
• What does chloroplast do?

  Photosynthesis
• Plant cells have a regular, rectangular shape, whereas animal cells have an irregular shape.
• What are the three principles of the cell theory?

  The three principles of the cell theory are: 1. All living organisms are composed of cells.

  2. The cell is the basic unit of structure and function in living organisms.

  3. Cells can only be made out of the division of pre-existing cells.
• What is the difference between plant and animal cells?

  Plant cells have a cell wall and chloroplasts, while animal cells do not.
• How do you prepare a wet mount slide?

  Place a specimen on a slide, add a drop of water, and cover it with a coverslip.
• What is the difference between unicellular and multicellular organisms?

  Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function.
• As the magnification increases, the field of view decreases
• Red blood cells carry oxygen throughout the body. They do not have a nucleus so that they can fit more oxygen.
• Epithelial cells are specialised for absorption, secretion and movement of substances. They have small hairs that can help with filtration.
• Muscle cells are specialised for contraction and have a large nucleus and lots of mitochondria.
• Micrometres are represented by the symbol �mμm. 11 micrometre is 1000th1000th of a millimetre, or 1,000,000th1,000,000th of a metre.