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6. A correlation occurs when a change in one or two variables is reflected by a change in the other variable
7. What is risk?
- A measure of the probability that damage to health will occur as a result of a given hazard
- A measure of chance that damage to health will occur as a result of a specfic hazard
- A relative measurement of if something may occur on a particular timescale
8. Lifestyle factors of cancer include:
- previous surgery
- smoking, diet, exposure to sunlight, aerobic exercise
- age and genetics
9. A carcinogen is not a chemical, form of radiation or other agent that causes cancer
10. How is the stomach adapted to prevent the enzymes it produces from digesting the surface of the stomach?
- By secreting mucus
- By having a muscular wall
- By only creating enzymes that don't work in acid solutions.
11. Why do large molecules often contain carbon?
- It's a common element
- Carbon atoms readily link to each other to form a chain
- They are organic molecules
12. The Benedict's test requires heating the solution
13. What substance is used for the test for starch?
- dissolved potassium iodide solution - turns from yellow to blue - black
- iodine
- potassium
14. What determines the structure of a 3-D protein?
- The sequence of amino acids
- The number of amino acids
- How many hydrogen bonds there are
15. Which are the weakest bonds in the tertiary structures of proteins?
16. Name one limitation of the lock and key model?
- The enzyme, the lock, is considered to be a rigid structure
- The substrate, or the key is a different shape depending on the chemical
- The shape depends on the amount of kinetic energy provided
17. Why are enzymes effective in small quantities?
- They can divide and share their substrates between different active sites
- They are not used up in the reaction and so can be used repeatedly
- They can move really fast to lots of substrate
18. A non competitive inhibitor binds to the enzyme's active site and is reversible
19. When studying organelles, why do they need to be kept in a buffered solution?
- To prevent osmosis occuring
- To maintain a constant pH
- To reduce enzyme activity
20. As electrons are negatively charged, the microscope beam can be focused using electromagnets
