Zinc Function in Enzymes
Zinc (Zn) is a vital trace element crucial for numerous biological processes, primarily acting as a cofactor for many enzymes.
Role in Carboxypeptidase A
Carboxypeptidase A is an enzyme responsible for breaking down proteins in the digestive system. It requires a zinc ion ($Zn^{2+}$) for its catalytic activity. The zinc ion is essential for substrate binding and hydrolysis.
Other Options Analysis
- Chlorophyll a: This molecule, essential for photosynthesis, contains Magnesium (Mg) as its central metal ion, not Zinc.
- Myoglobin: This protein stores oxygen in muscle tissue and contains Iron (Fe) as its core component.
- Vitamin $B_{12}$ (Cobalamin): This essential vitamin contains Cobalt (Co) as its central metal ion.
Conclusion
Based on the biochemical roles, Zinc is specifically required for the proper functioning of enzymes like Carboxypeptidase A. Therefore, Zinc is essential for the function of carboxypeptidase A.
Important Questions from Plant Biochemistry Enzymes Reactions
- Match the following digestive enzymes in Column I with their respective functions in Column II.
Column I Column II P. Erepsin (i) converts proteins to peptides Q. Steapsin (ii) activates trypsinogen to trypsin R. Pepsin (iii) converts fat into fatty acid and glycerol S. Enterokinase (iv) converts polypeptides to amino acids - Match the proteins in Column I with the organs in which they are maximally expressed in Column II.
Column I Column II P. Keratin (i) Liver Q. Surfactants (ii) Pancreas R. Pro-carboxypeptidase (iii) Lung S. Albumin (iv) Skin Identify the free radicals (marked as '?') in sequence from the inter-conversion of reactive oxygen species as shown below.
$O_2\rightarrow? \rightarrow H_2O_2 \rightarrow? \rightarrow H_2O$
P. $\mathrm{O}_2^{\bullet -}$
Q. $OH^-$
R. $HO_2^{-}$
S. $\ {}^{1}\mathrm{O}_2$
- Choose the CORRECT set of matches between group I and group II in relation to nitrogen fixation and assimilation
GROUP I GROUP II P. Nitrobacter 1. $NO_3^-$ $\rightarrow$ $NO_2^-$ Q. Nitrite reductase 2. $N_2$ $\rightarrow$ $2NH_3$ R. Nitrogenase 3. $NO_2^-$ $\rightarrow$ $NH_4^+$ S. Nitrate reductase 4. $NO_2^-$ $\rightarrow$ $NO_3^-$ - Select the CORRECT combination by matching Group-I with Group-II.
Group-I Group-II P. Photorespiration 1. Glutamate $\rightarrow$ 2-Oxglutarate Q. Respiration 2. Acetyl-CoA $\rightarrow$ Malonyl-CoA R. Amino acid degradation 3. 2-Oxglutarate $\rightarrow$ Succinyl-CoA S. Fatty acid synthesis 4. Glycine $\rightarrow$ Serine
