Chapter 5 - Metabolism and Enzyme

Which of the following factors can affect the rate of enzyme activity?

• Temperature and substrate concentration

• Temperature and pH

• Substrate Concentration and pH

• All of these

Which of the following best describes the action of an enzyme?

• A catalyst that speeds up reaction in cells and gets used up in the process

• A protein that functions as a biological catalyst

• A protein that speeds up reaction in cells and gets used up in the process

• A carbohydrate that functions as a biological catalyst

Which labelled part is the substrate?

• A

• B

• C

• D

What happens to trypsin if placed in a low pH environment for a long period?

• Enzyme increases the frequency of effective collision with substrate

• Enzyme denatured

• No change

What does the term optimum temperature mean for enzymes?

• the lowest temperature at which enzyme works

• the highest temperature before denaturing occurs

• the temperature that gives the highest enzyme activity

What is activation energy?

• Activation Energy is the energy needed to break the bond in the enzyme molecule before reaction can occur.

• Activation Energy is the energy needed to break the bond in the substrate molecule before reaction can occur.

What is the process characterised by the formation of glucose during plant photosynthesis?

• Saturnism

• Catabolism

• Anabolism

Housewives usually marinate meat with slices of unripe papaya to tenderise the meat. Which of the following can be used with the method below to minimise the time for tenderising the meat?

• Add some sugar

• Wrap the meat in foil and keep refrigerator for 2 hours

• Add some salt

• Keep at 40 degrees

A shirt has oily food stains on it and is washed using some biological washing powder. Which of the following enzymes helps in removing the stain?

• Cellulase

• Lipase

• Protease

Irsyad often gets severe stomach ache after drinking and eating dairy products. Dr Ng then prescribes him tablets which helped Irsyad drink milk without issue. What do these tablets contain?

• Lactase

• Ibuprofen

• Antihistamine

• Paracetamol