Use scissors or a scalpel to cut a small sample of tissue, peeling away or cutting a very thin layer of cells. The preparation method must ensure samples are thin enough to allow light to pass through. Place the sample onto a slide, add a drop of water if needed, apply appropriate stain, and gently lower a coverslip.
Choose intuitive scale factors (such as 1, 2, 5, or 10 units per large grid box). The plotted points must occupy more than 50% of the total grid area.
Track the time it takes for a cloudy protein suspension to turn completely clear. Maintaining Controlled Variables
Select at least 5 different values for the independent variable.
Keep temperature constant using a thermostatically controlled water bath; keep pH stable using specific chemical buffer solutions. Osmosis & Water Potential ( ) Investigations
| | Test | Positive Result | |---|---|---| | Reducing sugars (e.g., glucose) | Benedict’s test | Blue → Green → Yellow → Orange → Brick-red | | Starch | Iodine test | Blue-black | | Protein | Biuret test | Purple / Lilac | | Lipid | Emulsion test | Cloudy white emulsion |
Used to make specific concentrations independently. Use the formula To make 20 cm3cm cubed of a 2% glucose solution from a 10% stock solution: of stock solution. Volume of distilled water needed = Doubling (Serial) Dilution
I'll produce a comprehensive, organized document including:
Immerse uniform plant tissues (like potato cylinders or onion epidermal strips) in a range of sucrose or sodium chloride concentrations.
Use a colorimeter or compare samples against a standard color chart. Wide temperature fluctuations in the room.
Use scissors or a scalpel to cut a small sample of tissue, peeling away or cutting a very thin layer of cells. The preparation method must ensure samples are thin enough to allow light to pass through. Place the sample onto a slide, add a drop of water if needed, apply appropriate stain, and gently lower a coverslip.
Choose intuitive scale factors (such as 1, 2, 5, or 10 units per large grid box). The plotted points must occupy more than 50% of the total grid area.
Track the time it takes for a cloudy protein suspension to turn completely clear. Maintaining Controlled Variables biology 9700 practical notes
Select at least 5 different values for the independent variable.
Keep temperature constant using a thermostatically controlled water bath; keep pH stable using specific chemical buffer solutions. Osmosis & Water Potential ( ) Investigations Use scissors or a scalpel to cut a
| | Test | Positive Result | |---|---|---| | Reducing sugars (e.g., glucose) | Benedict’s test | Blue → Green → Yellow → Orange → Brick-red | | Starch | Iodine test | Blue-black | | Protein | Biuret test | Purple / Lilac | | Lipid | Emulsion test | Cloudy white emulsion |
Used to make specific concentrations independently. Use the formula To make 20 cm3cm cubed of a 2% glucose solution from a 10% stock solution: of stock solution. Volume of distilled water needed = Doubling (Serial) Dilution Choose intuitive scale factors (such as 1, 2,
I'll produce a comprehensive, organized document including:
Immerse uniform plant tissues (like potato cylinders or onion epidermal strips) in a range of sucrose or sodium chloride concentrations.
Use a colorimeter or compare samples against a standard color chart. Wide temperature fluctuations in the room.