Question

Carboxypeptidase requires which of the following elements for its activity?

• A. Zinc
• B. Niacin
• C. Iron
• D. Copper

Answer 1

The correct option is A

Zinc

The correct option is A.

Explanation for the correct option:

1. Carboxypeptidase is a pancreatic enzyme that is released into the small intestine.
2. As a metal ion cofactor, it comprises $\mathrm{Zn}\left(\mathrm{II}\right)$ ions.
3. This enzyme aids in protein digestion and is activated in an alkaline medium.
4. Large peptides or polypeptides are converted into dipeptides and amino acids by this enzyme.

Explanation for the incorrect options:

Option B:

1. Niacin is commonly known as vitamin B₃ or nicotinic acid.
2. It is an essential water-soluble, vitamin that is helpful in increasing high-density lipoprotein (HDL) and lowering low-density lipoprotein (LDL) cholesterol when given in large quantities.

Option C:

1. Iron belongs to group $\text{VIII}$ of the periodic table.
2. It is a silver-grey metal that is malleable, lustrous, and ductile.
3. It can be found in four different crystalline forms.
4. It dissolves quickly in dilute acid.

Option D:

1. Copper is a chemical element that is represented by the symbol $\left(\mathrm{Cu}\right)$ and whose atomic number is $29$.
2. Copper has a density of $8.96$.
3. Copper is a necessary element for our body.
4. To help enzymes transport energy in cells, an adult human needs about $1.2$ milligrams of copper every day.
5. An excessive amount of copper can be fatal.

Final answer: Carboxypeptidase requires zinc for its activity.