𝐛𝐢𝐨𝐥𝐨𝐠𝐲 𝐭𝐞𝐬𝐭𝟏

• Tissue:

  a group of cells in the same place, all doing the same thing
• Diffusion:

  the movement of particles from an area of higher concentration to an area of lower concentration
• Specialised cells

  Cells that have specific structures and functions in the body
• Examples of specialised cells:

  •Red blood cells

  •sperm cells

  •root hair cells

  •nerve cells

  •palisade cells

  •xylem cells
• Total magnification:

  =power of objective lense x power of eyepiece
• Cell wall

  Protects the cell, made of cellulose
• Cell membrane


  Controls what moves in and out of the cell
• Chloroplasts


  Contains chlorophyll, which absorbs light energy for photosynthesis
• Cytoplasm

  Most chemical processes take place here, controlled by the enzymes
• nucleus

  controls the activity of cell, also contains DNA
• Mitochondria

  Respiration happens
• Vacuole


  Fills with cell sap, which keeps the cell firm
• Osmosis


  The net movement of water molecules across a semi permeable membrane from a region of higher concentration to a region of lower water concentration
• mag=image size divided by actual size

  Image size= actual x mag

  Actual= image divided by mag
• What Is microscopy 


  To look at objects too small to be seen by the naked eye
• What consists of the microscope?


  eyepeice-usually magnifies objects x10

  Coarse focus

  Fine focus

  Objective lense-normally x4 x10 x40

  Stage-holds the glass slide with object on it
• Differentiation 


  process by which a cell changes to become specialised

  As cell changes they develop different sub cellular structures and turn into diff types of cells
• enzymes 


  a protein that functions as a biological catalyst - a substance that speeds up a chemical reaction without being changed by the reaction
• What is the moduel?


  Lock and key method
• active transport


  the movement of particles across a semi permeable membrane using energy for ATP
• 𝐓𝐢𝐬𝐬𝐮𝐞𝐬

  𝐀 𝐠𝐫𝐨𝐮𝐩 𝐨𝐟 𝐜𝐞𝐥𝐥𝐬 𝐰𝐨𝐫𝐤𝐢𝐧𝐠 𝐭𝐨𝐠𝐞𝐭𝐡𝐞𝐞 𝐭𝐨 𝐝𝐨 𝐚 𝐩𝐚𝐫𝐭𝐢𝐜𝐮𝐥𝐚𝐫 𝐣𝐨𝐛