Zinc is a cofactor of
**Core Concept**
Zinc is an essential trace element involved in various enzymatic reactions, playing a crucial role in protein synthesis, DNA replication, and cell signaling. It acts as a cofactor for numerous enzymes, facilitating their catalytic activity.
**Why the Correct Answer is Right**
Zinc is a crucial component of many enzymes, including carbonic anhydrase, which catalyzes the reversible reaction of carbon dioxide and water to form bicarbonate and protons. Zinc also plays a key role in the activity of alcohol dehydrogenase, an enzyme involved in the metabolism of alcohol. Furthermore, zinc is a component of the enzyme DNA polymerase, which is essential for DNA replication and repair.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because while zinc is involved in protein synthesis, it is not a direct cofactor for the enzyme responsible for this process.
* **Option B:** This option is incorrect because although zinc is involved in cell signaling, it is not a cofactor for the specific enzymes involved in this process.
**Clinical Pearl / High-Yield Fact**
Zinc deficiency can lead to impaired wound healing, increased susceptibility to infections, and impaired taste and smell. Additionally, zinc supplementation is often recommended for patients with diarrhea, as it can help to maintain intestinal integrity and reduce the severity of diarrhea.
**Correct Answer:** C.