Question

Identify the correct statement regarding enzymes.
A. Enzymes are specific biological catalysts that can normally function at very high temperatures.
B. Enzymes are normally heterogeneous catalysts that are very specific in fiction.
C. Enzymes are specific biological catalysts that cannot be poisoned.
D. Enzymes are specific biological catalysts that possess well defined active sites.

Answer 1

Hint: Enzymes are proteins that act as biological catalysts. Catalysts generally increase chemical reactions. The molecules upon which enzymes can act are known as substrates and the enzyme which converts the substrates into different molecules known as products.

Complete answer:
There are number of properties which are defined by enzymes and these are described as follows:
Highly efficient in nature, mainly enzyme catalysis are highly efficient where efficiency can be defined as when one molecule of an enzyme may transform one million molecules of the reactant per minute.
Highly specific in nature, catalysis enzymes are highly specific in nature and each enzyme is specific for a given reaction which can be described as one catalyst can-not catalyse more than one reaction.
Highly active under optimum temperature, the rate of an enzyme reaction becomes maximum at a definite temperature known as the optimum temperature.
Highly active under optimum pH, the rate of an enzyme-catalysed reaction is maximum at a particular pH called optimum pH which is generally between pH values of 5-7.
Hence from the above discussion we can say that enzymes are normally homogeneous catalysts and are said to be specific biological catalysts that possess well defined active sites.

Option D is the correct answer.

Note:
Enzymes function at physiological temperature that is the temperature nearly equals to 37 degree Celsius and enzymes can be poisoned by using suitable inhibitors. Enzyme catalysis is said to be unique in its efficiency and a high degree of specificity.