Year 9 cover lesson Friday 2nd Feb

• Science
• Lower Secondary (Key Stage 3)

Year 9 cover lesson 

Friday 2^nd Feb

What food test is used to detect the presence of starch?

1. Biuret test
2. Iodine test
3. Ethanol test
4. Benedict's test

What food test is used to detect the presence of reducing sugars?

1. Ethanol test
2. Biuret test
3. Iodine test
4. Benedict's test

What food test is used to detect the presence of protein?

1. Biuret test
2. Sudan III test
3. Iodine test
4. Benedict's test

What food test is used to detect the presence of lipids?

1. Iodine test
2. Benedict's test
3. Biuret test
4. Ethanol test

What is the main role of enzymes in digestion?

1. To break down food into smaller molecules
2. To transport nutrients to the cells
3. To provide energy for the body
4. To regulate body temperature

What is the role of the enzyme lipase?

1. To convert proteins into amino acids
2. To facilitate absorption of water
3. To break down carbohydrates
4. To break down fats

What is an enzyme?

1. A type of carbohydrate
2. A form of DNA
3. A protein that speeds up chemical reactions
4. A type of lipid

Where are enzymes found in the human body?

1. Only in the blood
2. Only in the liver
3. In various organs and tissues
4. Only in the brain

What is the function of enzymes in the body?

1. To regulate body temperature
2. To store energy in cells
3. To produce hormones in the body
4. To catalyze biochemical reactions

How do enzymes work?

1. By increasing the acidity of the environment
2. By decreasing the substrate concentration
3. By changing the temperature of the surroundings
4. By lowering the activation energy of reactions

What can affect the activity of enzymes?

1. Temperature and pH levels
2. Blood pressure and heart rate
3. Muscle strength and flexibility
4. Emotional state and mental concentration

Where are enzymes typically found?

1. In rocks.
2. In cells.
3. In the atmosphere.
4. In space.

Which part of the enzyme does the substrate bond to?

1. The peptide bond
2. The reactive site
3. The active site
4. The capsule

Describe the role of lipase.

Name three enzymes present in our digestive system. For each one state the large molecule it breaks down.

Name the substrate of amylase and the products of the reaction it catalyses

Bread contains carbohydrates. After chewing for a short time bread starts to taste sweet.
Explain why.

Which monomers make up fats?

Explain why pH affects enzyme activity.

Name the organ which produces bile.

Explain the importance of stomach acid

State two functions of bile.

Describe the effects of bile on the surface area of fats.