23 Questions
Which of the following is an example of a coenzyme?
NADH
Which of the following is a characteristic of a prosthetic group?
It is an integral part of the enzyme's structure
Which of the following statements about cofactors is true?
Cofactors can be tightly or loosely bound to the enzyme
Which of the following is a characteristic of a coenzyme?
Coenzymes are non-protein molecules or ions.
Which of the following is a characteristic of a cofactor?
Cofactors are non-protein molecules or ions.
Which of the following is a characteristic of a prosthetic group?
Prosthetic groups are permanently attached to enzymes.
Which of the following is an example of a coenzyme?
NADH
Which of the following is an example of a cofactor?
Metal ions
Which of the following is an example of a prosthetic group?
Heme
Which of the following is true about coenzymes?
Coenzymes can transfer chemical groups between enzymes.
Which of the following is true about cofactors?
Cofactors can transfer chemical groups between enzymes.
Which of the following is true about prosthetic groups?
Prosthetic groups are loosely bound to enzymes.
Which of the following is true about apoenzyme and coenzyme?
Apoenzyme + coenzyme = Holoenzyme.
Which of the following is a characteristic of a coenzyme?
Coenzymes are non-protein molecules or ions.
Which of the following is an example of a prosthetic group?
Heme
Which of the following is true about cofactors?
Cofactors are mobile and can transfer chemical groups between enzymes.
Which of the following is true about prosthetic groups?
Prosthetic groups are tightly and permanently attached to enzymes.
Which of the following is an example of a coenzyme?
Coenzyme Q10
Which of the following is a characteristic of a cofactor?
Cofactors are inorganic molecules.
Which of the following is true about coenzymes?
Coenzymes are non-protein molecules or ions.
Which of the following is true about apoenzyme and coenzyme?
Apoenzyme and coenzyme interact to form the functional enzyme.
Which of the following is a characteristic of a prosthetic group?
Prosthetic groups are tightly bound to enzymes.
Which of the following is an example of a cofactor?
NADH
Study Notes
Cofactors and Coenzymes
- Coenzymes: non-protein molecules that bind to enzymes, assisting in catalysis, and are often derivatives of vitamins
- Cofactors: ions or molecules that bind to enzymes, enabling catalysis, and can be metal ions, vitamins, or derived from vitamins
- Prosthetic groups: tightly bound molecules, often covalently attached, that are integral to the enzyme's active site and involved in catalysis
Characteristics of Coenzymes
- Loose binding to the enzyme, allowing for easy removal and reattachment
- Can be used multiple times, recycled, or re-synthesized
- Often involved in group transfer reactions, redox reactions, or acid-base catalysis
Characteristics of Cofactors
- Can be inorganic ions, such as metal ions (e.g., Fe, Zn, Cu), or organic molecules (e.g., vitamins, flavins)
- Bind to the enzyme, often with varying degrees of strength, to facilitate catalysis
- Can be tightly bound (prosthetic group) or loosely bound (coenzyme-like)
Characteristics of Prosthetic Groups
- Tightly bound to the enzyme, often covalently attached
- Integral to the enzyme's active site, involved in catalysis
- Examples include flavin adenine dinucleotide (FAD) and heme groups
True Statements about Coenzymes, Cofactors, and Prosthetic Groups
- Apoenzyme (enzyme without cofactor) + coenzyme = active enzyme
- Coenzymes can be removed and reattached to the enzyme
- Cofactors can be metal ions, vitamins, or derived from vitamins
- Prosthetic groups are tightly bound to the enzyme and involved in catalysis
Test your knowledge on the differences between coenzymes, cofactors, and prosthetic groups in this informative quiz. Learn about their distinct characteristics and roles in enzyme function.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
