The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called

Answer: Option A

Biocatalysts are substances that increase the rate of biochemical reactions in living organisms without being consumed in the process.

Proteins synthesis and metabolism: These vital biological processes occur in the presence of enzymes, which act as natural catalysts. Enzymes are often referred to as ferments in older terminology.

Why not others:
Haemoglobin is a respiratory pigment that transports oxygen, not a catalyst for metabolism.

Fungi are microorganisms that may produce enzymes but are not themselves the direct biocatalysts.

"None of these" is incorrect because enzymes are the true catalysts involved in these reactions.

Conclusion: The correct answer is a ferment or an enzyme, since they catalyze protein synthesis and metabolic processes.