Which one of the following is a non-protein group covalently bonded to a few respiratory enzymes, among others?
Correct answer: B. Flavin adenine dinucleotide.
- A. Nicotine adenine dinucleotide.
- B. Flavin adenine dinucleotide.
- C. Nicotinamide adenine dinucleotide phosphate.
- D. All of the above options are correct.
Explanation
Flavin adenine dinucleotide (FAD) is a non-protein group that is covalently bonded to a few respiratory enzymes, among others.FAD is a redox-active coenzyme that plays a crucial role in various metabolic reactions, particularly cellular respiration. It acts as a carrier of electrons and hydrogen atoms during oxidative reactions. FAD is derived from the vitamin riboflavin (vitamin B2) and consists of a flavin mononucleotide (FMN) molecule attached to an adenosine diphosphate (ADP) moiety. It can be covalently bound to certain enzymes, serving as a prosthetic group. In respiratory enzymes, such as flavoproteins, FAD is covalently attached to the enzyme's active site and participates in redox reactions, transferring electrons and hydrogen atoms between substrates. Therefore, FAD is a non-protein group covalently bonded to a few respiratory enzymes, among others, and functions as a vital cofactor for their catalytic activity.
Last updated
About Biological Molecules
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
Practise Biological Molecules
1,790 free Biological Molecules 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.