Question

Sulphur is present in

• A. Cysteine and Methionine
• B. Ferredoxin and Coenzyme A
• C. All amino acids
• D. Both (A) and (B)

Answer 1

Answer: (D)

Cysteine and Methionine are sulphur containing amino acids. Chemical formula of cysteine is $C_3{H}_{7}N{O}_{2}S$ . Chemical formula of Methionine is : $C_5{H}_{11}N{O}_{2}S$ . Ferrodoxin (Fd) is present in the chloroplast and brings about electron transfer in photosynthesis. It is iron-sulphur cluster. Coenzyme A is very important coenzyme in citric acid cycle as it brings about oxidation of pyruvate. Its chemical formula is ‎ $C_{21}{H}_{36}{N}_7{O}_{16}{P}_{3}S$