OBJECTIVE LIFE SCIENCE
BIOCHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
enzymes are specific to substrates (lock and key)
|
|
|
enzymes are activated by molecules
|
|
|
enzymes can work with any substrate
|
|
|
enzymes are found everywhere
|
Detailed explanation-1: -The first model called the lock and key model, proposes that the shape and chemistry of the substrate are complementary to the shape and chemistry of the active site on the enzyme. This means when the substrate enters the active site, it fits perfectly, and the two binds together, forming the enzyme-substrate complex.
Detailed explanation-2: -In the lock and key model, the shape of the active site matches the shape of its substrate molecules. This makes enzymes highly specific – each type of enzyme can catalyse only one type of reaction (or just a few types of reactions).
Detailed explanation-3: -Yes, the shape of the enzyme is crucial to determining the function. Enzymes are specialized proteins that can either build up or break down reactants. The area of the enzyme where the substrate binds is specifically shaped to fit that substrate. If the enzyme is denatured, it cannot bind to the substrate.