What is not true about enzyme?
Correct answer: D. An enzyme is completely converted to product during metabolism.
- A. The Keq of a reaction remains unchanged in the presence of an enzyme
- B. Enzymes speed up the rate of reaction in DNA synthesis
- C. Harsh, acidic conditions can completely denature an enzyme
- D. An enzyme is completely converted to product during metabolism.
Explanation
Option A: Kéq of reaction remains unchanged in the presence of an enzyme. This is true about enzymes. So, it will not be the right answer.Option B ;Enzymes speed up the rate of reactions. It is also a correct statement about enzymes. So, it will not be the right answer because we have to pick the wrong statement about enzymes. Option C : Extreme changes in pH alter the ionic charge of the acidic and basic groups of enzymes and therefore disrupt the ionic bonding (denaturation) that helps to maintain the specific shape of the enzyme.KETS PMC Topic # 7 page # 157 Option : D While enzymes do not change the amount of product formed in a reaction (no change to Keq) they do speed up the rate of reaction. It is also true that under certain conditions pH and/or heat can denature an enzyme. During a reaction, an enzyme does not get used up and is regenerated; enzymes are a type of catalyst.So, a statement in option D is not true about enzymes. Hence, D is the right answer.
Last updated
About Enzymes
Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
Practise Enzymes
633 free Enzymes MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A/An _ is mostly a non-protein chemical compound that is required for the protein's biological activity.
A chemical substance that can react with an enzyme but not transform into a product is called a/an:
A chemical substance that can react with an enzyme faster than a real substrate and without producing a product is
A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product(s) and thus blocks the active site temporarily or permanently is called:
A chemical substance which can react with an enzyme but not transform into a product is called a/an: