This week we started to look at the structure and function of cells. Make sure you can name and identify the following organelles within cells:
- Nucleus and nucleous
- Cell membrane (phosopholipid bilayer)
- Cytoplasm and cytosol
- rough and smooth endolplasmic reticulum
- golgi body (golgi apparatus)
- vacuoles (small in animal cells, large in plant cells)
- cell wall (made of cellulose in plant cells)
- Choroplasts (containing chlorophyll in plant cells).
This is a model of an animal cell made from cake showing the different organelles of a typical cell. The nucleus is shown by the freckle, mitochondrian was shown by the purple jelly beans, the lysosomes were the yellow jelly beans, the centrioles was the musk sticks which were then placed on the cytosol (icing), the vaccuole was shown by two freckles placed upside-down, the endoplasmic reticulum was made with yellow snakes and the rough endoplasmic reticulum was made with yellow snakes with 100’s and 1000’s laces on top to make the ribosomes and for the golgi compex was made by placing a pink snake on the icing.
This activity was enjoyed by the year 11 biology group. Making a model of a cell meant that we could relate to what a real one looked like. This made it easier to remember the names of parts of the cell and what their function was.
Chapter 1 (Cell Discovery and Exploration): Stephanie and James
Chapter 2 (Cell Structure and Function): Chris and Melissa
Chapter 3 (Composition of Cells): Charlotte and Catherine
Chapter 4 (Cell replication – Mitosis and Meiosis): Monique and Chloe
This is the animal cell model made by a group of students in year 11 Biology – each of the lollies represents a different cell organelle. Can you find the ribosomes, nucleus, smooth and rough endoplasmic reticulum, golgi bodies, vacuole and mitochondria? Below is the model of a plant cell – note the cell wall, chloroplasts and large vacuole.
This beautiful image is of a Paramecium (a common unicellular organism found in freshwater environments), using enhanced phase-contrast microscopy. It is an example of a protozoan – that is, a ‘first animal’. If you look closely, you can see the cilia (tiny, hair-like projections) that propel the organism through the water and the phospholipid bilayer (cell membrane) that is the barrier between the external and internal environment of the cell. In the top right of the image you can see water being ejected from the contractile vacuole, which helps to maintain the correct water balance inside the cell (osmoregulation). Water will naturally diffuse into the cell, as the cell’s contents have a higher concentration of salts and nutrients. The contractile vacuole is a specialized structure that collects this excess water and expels it from the cell, to prevent the cell membrane from rupturing.