**Core Concept:** Enzymes are biological catalysts that speed up biological reactions without being consumed in the process. They contain various cofactors, which are small molecules that help the enzyme function properly. **Zinc (Zn2+) is a common cofactor found in several enzymes.**

**Why the Correct Answer is Right:** Zn2+ ions are essential for the proper functioning of certain enzymes. Option A, B, and D all contain Zn2+ as a cofactor, making them incorrect answers.

**Why Each Wrong Option is Incorrect:**

A. **Option A:** This enzyme contains Zn2+ as a cofactor, making it incorrect as per the question.
B. **Option B:** This enzyme also contains Zn2+ as a cofactor, making it incorrect.
C. **Option C:** This enzyme contains Zn2+ as a cofactor, making it incorrect as per the question.
D. **Option D:** This enzyme contains Zn2+ as a cofactor, making it incorrect.

**Clinical Pearl:** **Zinc (Zn2+) deficiency can lead to impaired wound healing, decreased immune function, and gastrointestinal problems.** Ensuring adequate Zn2+ intake is crucial for overall health and disease prevention.

**Correct Answer:** Option A (Alpha-Galactosidase) does not contain Zn2+ as a cofactor. Alpha-galactosidase is an enzyme involved in glycogen breakdown while Zn2+ cofactors are required for enzymes involved in DNA replication, transcription, and protein synthesis.