S assimilation (Biochemistry) & anaplerotic reaction

During the process of sulfur reducation, S is converted to

• SO₄

• SO₃

• H₂S

• APS

Identify the CORRECT statements by looking into the below diagram

(i) it shows both oxidation and reduction of S

(ii) it shows the assimilatory sulfur reduction (A) & Dissimilatory sulfur reduction (B)

(iii) it shows the assimilatory sulfur reduction (B) & Dissimilatory sulfur reduction (A)

(iv) H₂S is the final product of S reduction

• (i) & (ii)

• (i) & (iii)

• (ii) & (iv)

• (iii) & (iv)

Enzyme that is invovled in the conversion of sulfite to hydrogen sulfide

• Sulfate reducatase
• sulfite reductase
• sulfhydrylase
• desulfuralse

Identify the CORRECT order in which S is reduced in the cell

• SO₄ > APS > PAPS > H₂S >SO₃

• SO₄ > PAPS > APS > H₂S >SO₄

• SO₃ > >SO₄ > APS > PAPS > H₂S

• SO₄ > APS > PAPS > SO₃ > H₂S

In the below diagram identify the products A and B correctly

• PAPS & APS

• APS & PAPS

• O-acetyl-L-serine & Cysteine

• Cysteine & O-acetyl-L-serine

Which is the amino acid in which S is present after its reduction inside cells

• methionine

• glutatmate

• serine

• cysteine

Function of the enzyme sulfite reductase is

• convert SO₃ to SO₄

• convert PAPS to SO₄

• convert PAPS to SO₃

• convert SO₃ to H₂S

Anaplerotic reactions are commonly noticed in

• glycolysis
• TCA cycle
• Pentose phosphate pathway
• Acetyl pathway

Trace the two amino acids that are involved in anaplerotic reactions

• glutamate & serine

• Oxoglutarate & aspartate

• Aspartate & glutamate

• Oxoglutarate & Oxaloacetate

One of the intermediates of the TCA cycle that need to be commonly replinished by anaplerosis is

• oxalo acetate
• citrate
• pyruvate
• fumarate