Chapter 4 - Enzymes

Which process involves the synthesis of complex molecules from simpler molecules and it requires energy input?

• Anabolism.

• Catabolism.

Which is not true about enzyme?

• It is a biological catalyst.

• It is a globular protein.

• It remains unchanged at the end of reaction.

• It increases the activation energy of reaction.

__________ energy is the minimum energy required for reactants to reach the transition state before changing into the product.

• Activation

• Anabolic

• Endergonic

• Exergonic

Lock-and-key hypothesis was proposed by _______________.

• Emil Fischer.

• Daniel Koshland.

In lock-and-key hypothesis, __________ is the "lock" while __________ is the "key".

• enzyme, active site

• active site, enzyme

• active site, substrate

• substrate, active site

_______________ hypothesis suggested that the active site is flexible and is not exactly complementary to the shape of the substrate.

• Lock-and-key

• Induced-fit

The higher the Km value, the __________ the affinity of an enzyme to bind with its substrate.

• higher

• lower

Trypsin works best at pH of _____.

• 2.0

• 6.8

• 7.8

• 9.0

Which of the following is the example of prosthetic group?

• Magnesium.

• Haem.

• Pyridoxine.

• Selenium.

Magnesium, nickel, zinc and manganese are the examples of _______________.

• prosthetic groups.

• coenzymes.

• enzyme activators.