Reflection

Today we're going to be on the computers for an hour before going back to w12 for a practical. Answer the following:
These first questions are about your experiences this year, so we can all keep improving. Take a minute for each one and try to be as honest as possible.

1. What do you feel are your strengths in Science? What do you do well?
2. What would you like to get better at to improve your marks?
3. How do you think you could go about this?
4. What have you enjoyed in class this year?
5. What would you have liked to change or do differently?
6. Explain the steps involved for DNA to make a protein:
7. What do lysosomes do?
8. Name one other organelle and explain it's function:
9. Why are lysosomes important in the cell?
10. Watch this documentary from the BBC earlier this year. It summarises really well what you'll need to know for GCSE, as well as lots of sixth form Bio stuff! How many cells make up the average human body?

Diffusion and Osmosis

Today we're going to start looking at diffusion and osmosis in cells, which is the start of the year 11 course. Answer the following in your books:

1. How can you define diffusion?
2. Explain WHY diffusion occurs in some conditions, but not others:
3. Where in the body does diffusion occur?
4. What part of the CELL allows diffusion to occur?
5. What things affect the rate of diffusion?
6. How would you explain a concentration gradient?
7. What is osmosis?
8. How could you make cells in a solution get smaller, or larger?
9. What do isotonic, hypotonic and hyper tonic mean?
10. Explain how osmosis can kill cells:
11. Name two organelles and explain what they do in the cell:
12. Watch this video, and then explain the difference between osmosis and diffusion in your own words:                         

Extension - In what ways are our lungs adapted to help gases diffuse into and out of the blood more quickly?