Biology Mcqs

Which statement is incorrect about Lock and Key Model________________?

by

Which statement is incorrect about Lock and Key Model________________?

A. Specific enzyme can transform only a specific substrate
B. Active site of an enzyme is a non flexible structure
C. Active site does not change before during or even after the reaction
D. It explains the mechanism of every chemical reaction

The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?

by

The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?

A. Increase in enzyme molecule increases the available active sites.
B. This relation is for unlimited time period with unlimited enzyme concentration
C. If the concentration is doubled the rate will become two fold.
D. None of these.

If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because_____________?

by

If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because_____________?

A. There is probably more substrate present than there is enzyme.
B. There is probably more enzayme available than there is substrate.
C. There is probably more product present than there is either substrate or enzyme.
D. The enzyme substrate complex is probably failing to form during the reaction

Which statement about enzyme is incorrect_________________?

by

Which statement about enzyme is incorrect_________________?

A. Some of them consist solely of protein with no non protein part.
B. They catalyze a chemical reaction without being utilized.
C. All enzymes are fibrous Proteins.
D. They without their cofactor are called apoenzyme.