S3 Bio U3 (Enzymes)

Which of the following is/are the properties of enzymes?

• They increases the rate of metabolism

• They is specific to one kind of substrate

• They can operate at any temperatures

• They are reusable

What does the lock-and-key hypothesis suggest?

• Enzymes are specific

• Enzymes are reusable

• Enzymes have optimum temperatures

• Enzymes can break down substrate

If 5mL of starch solution can be digested into maltose in 5 minutes, what is the rate of amylase activity?

• $\frac{amount\ of\ starch}{time\ needed\ for\ the\ disappeance\ of\ starch}=\frac{5}{5}=1$

• $\frac{1}{time\ needed\ for\ the\ disappeance\ of\ starch}=\frac{1}{5}=0.2$

• $\frac{1}{amount\ of\ starch}=\frac{1}{5}=0.2$

• $\frac{1}{time\ needed\ for\ one\ mL\ of\ starch\ to\ disappear}=\frac{1}{1}=1$

The rate of enzymatic activity decreases after optimum temperature because enzymes start to ____.

What are anabolic reactions?

• The process of enzymes breaking-down substrates

• The process of substrates breaking-down enzymes

• The process of enzymes building-up substrates

• The process of products building-up substrates

What are catabolic reactions?

• The process of enzymes breaking-down substrates

• The process of substrates breaking-down enzymes

• The process of enzymes building-up substrates

• The process of products building-up substrates

What is an optimum temperature of an enzyme?

• The highest kinetic energy both the substrate and enzyme can be

• The temperature before enzymes denature

• The highest reaction rate

• The only temperature enzymatic activities take place

What does enzyme denaturing show?

• They are specific

• They are protiens

• They are reusable

• They are affected by temperature

Why is enzymatic activities low in low temperatures?

• The enzymes is active

• The enzymes are not functioning correctly

• The enzymes and substrates have a lower chance of collision due to low kinetic energy

• Enzymes only work at optimum temperature

How should the enzymatic reaction be described?

• It rises from a low temperature, when it reaches optimum temperature it is the highets and after that it remains unchanged

• It rises from a low temperature, when it reaches optimum temperature it is the highest, after that it continues to increase in a slower pace

• It rises from a low temperature, when it reaches optimum temperature it is the highest, after that it drops

• It reduces from a low temperature, when it reaches optimum temperature it is the lowest, then it rises