The class of enzymes, which catalyze addition of groups to double bonds and non-hydrolytic removal of chemical groups, is
Enzyme Classes: Addition to Double Bonds
The question asks to identify the enzyme class responsible for adding groups across double bonds or removing groups non-hydrolytically. This involves reactions that typically form or break double bonds, often without the involvement of water.
Enzyme Class Functions Explained
Let's examine the functions of the relevant enzyme classes:
- Oxidoreductases: These enzymes catalyze oxidation-reduction reactions, transferring electrons between molecules.
- Transferases: They catalyze the transfer of a specific functional group (like a methyl or phosphate group) from one molecule (the donor) to another (the acceptor).
- Hydrolases: These enzymes use water to break chemical bonds, a process called hydrolysis. Examples include breaking down proteins into amino acids or carbohydrates into sugars.
- Lyases: Lyases catalyze reactions where functional groups are added to double bonds or removed from a molecule to form a double bond. Importantly, these reactions do not involve hydrolysis or oxidation. They directly create or eliminate double bonds.
Identifying the Correct Enzyme Class
Based on the definitions:
- The description "catalyze addition of groups to double bonds" directly matches the function of lyases.
- The description "non-hydrolytic removal of chemical groups" also aligns with lyases, as they form double bonds by removing groups without using water.
Therefore, the enzyme class that fits the description provided in the question is lyase.
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
