Bellringers

1. Bellringers Unit Test on Cells Friday in the computer lab (1-213) : Cell types, Cell organelles (structure/function ) Cell Transport – active and passive Cell membrane –structure/function Cell theory

2. Cell Types Identify the following cells types and list the main differences between the two cell types.

3. Plant Cell- Name the structure and match it to the function I am a storage unit for the cell I am an organelle that is unique to plants . I capture the sun’s energy and convert it to chemical energy through the process of photosynthesis . I manage all cellular functions and contains DNA . I am a selectively permeable boundary that controls what enters and leaves the cell. Animal Cell – Match the structure to its function I convert fuel into energy for the cell. I help manufacture proteins I store genetic material I hold all the cell contents and separate the cell from its environment

4. What is this ? Looks like a sandwich . The lipid bilayer is composed mainly of which two macromolecules Describe the head and tail of the phospholipidbilayer. Why is it structure this way ?

5. Match the function to the Structure. • packages proteins for transport • Firm, protective structure that gives cell its shape in plants, fungus and most bacteria . • Produces lipids • Digest excess or worn out cell parts using enzymes. Keeps the cell clean and healthy • Site where ribosomes are made • Ribbon-like membrane that is pleated and folds. Its bumpy because its has ribosomes attached to it. This organelle works closely with the golgi apparatus . • Nucleolus • Golgi Apparatus • Lysosomes • Smooth Endoplasmic Reticulum • Cell Wall • Rough Endoplasmic Reticulum

6. Bellringer 2/6/14 1. What is the process by which molecules naturally flow from an area of high concentration to an area of low concentration called? 2. The diffusion of water across a selectively permeable membrane is called _____________ isotonic • 3. Describe the following solutions: hypertonic vs. hypotonic • open to page 86

7. Cell Transport The following link will assist in understanding Cell transport.he surfaces of cell membranes are hydrophilic (water-loving); the interiors http://www.phschool.com/science/biology_place/biocoach/biomembrane1/osmosis.htmlare hydrophobic 3. My prefix means “equal” . Water moves in and out of the cell at an equal rate. 4. My prefix means “ under” . There is more water outside the cell , then inside the cell cause the cell to swell because of pressure increase . Animal cells can burst , but plant cells become firmer. This is why publix will mist the fruits and vegetables ..keeping them looking FRESH. 5. My prefix means, “above” . Water leaves the cell by osmosis and pressure is decreased causing the cell to shrink. In plants , it causes wilting. Osmosis and diffusion are passive transport . When there is movement from low concentration to high concentration the cell has to use its own energy (active transport). This helps the cell maintain homeostasis Hydrophilic molecules tend to interact with water and with each other. Hydrophobic molecules avoid interaction with water and tend to interact with other hydrophobic molecules.