Enzymes

To solve the problem, we need to match each element from List I with the corresponding element in List II based on their functions or characteristics:

1. GLUT-4: This is a glucose transporter found in adipose tissues and striated muscle and is responsible for glucose transport into cells. Thus, it corresponds with IV: "Enables glucose transport into cells".
2. Insulin: A hormone that regulates glucose levels in the blood, triggering the uptake of glucose from the blood into fat, liver, and skeletal muscle cells. This matches with I: "Hormone".
3. Trypsin: It is an enzyme that helps in the digestion of proteins in the small intestine. Trypsin is a match for II: "Enzyme".
4. Collagen: A structural protein found in various connective tissues, providing structural support for cells. It corresponds to III: "Intercellular ground substance".

The correct matching is therefore: A-IV, B-I, C-II, D-III.

Step 1: Understanding Enzyme Inhibition:

Enzyme inhibition occurs when a substance (inhibitor) binds to an enzyme, reducing its activity. Inhibition can be competitive, non-competitive, or uncompetitive depending on how the inhibitor interacts with the enzyme.

Step 2: Competitive Inhibition:

In competitive inhibition, the inhibitor molecule resembles the substrate and competes for the same active site on the enzyme. This prevents the substrate from binding to the enzyme and reduces the enzyme's activity. However, if the concentration of the substrate is high enough, it can overcome the effect of the inhibitor by outcompeting it for binding to the enzyme.

Step 3: Analyzing the Given Options:

Option 1: Non-competitive inhibition

In non-competitive inhibition, the inhibitor binds to a site other than the active site, changing the enzyme's shape and making it less effective. This does not apply in the case of malonate and succinic dehydrogenase.

Option 2: Uncompetitive inhibition

Uncompetitive inhibition occurs when the inhibitor binds only to the enzyme-substrate complex, preventing the reaction from proceeding. This is not the case with malonate.

Option 3: Competitive inhibition

In this case, malonate competes with the substrate (succinate) for the active site of the enzyme succinic dehydrogenase. Malonate resembles the substrate closely and directly competes with it for binding, which is a clear example of competitive inhibition.

Option 4: Allosteric inhibition

Allosteric inhibition involves the inhibitor binding to a site other than the active site (an allosteric site), causing a conformational change that affects the enzyme’s activity. This is not relevant to malonate and succinic dehydrogenase.

Step 4: Conclusion:

The correct type of inhibition in this case is competitive inhibition, where malonate competes with succinate for the active site of the enzyme.

Answer: The correct answer is Option 3: Competitive inhibition.

In the study of enzymes, a cofactor is a non-protein chemical compound that is required for the enzyme's biological activity. Carboxypeptidase is an enzyme that plays a key role in the digestion of proteins by removing amino acid residues from the carboxyl end of a peptide chain. The functionality and catalytic activity of carboxypeptidase depend on the presence of a specific metal ion cofactor.

For carboxypeptidase, the cofactor is: Zinc

Zinc ions (Zn²⁺) are crucial for the enzymatic activity of carboxypeptidase. They facilitate the reaction by stabilizing the enzyme-substrate complex and playing a direct role in the hydrolysis of the peptide bonds. Therefore, zinc acts as a stabilizing agent and helps in the coordination of water molecules necessary for the catalysis process.

This specific requirement for zinc as a cofactor is common among enzymes that belong to the metalloprotease class, which includes carboxypeptidase. The correct functioning and efficiency of carboxypeptidase are significantly compromised without the presence of zinc, demonstrating the metal's essential role in the enzymatic mechanism.

Step 1: Understanding the terms and their functions:

A. -1 antitrypsin:
The -1 antitrypsin protein is a protective enzyme that inhibits the activity of enzymes like elastase, which can damage lung tissues. A deficiency in -1 antitrypsin causes emphysema, a condition where the lung tissue is damaged, leading to breathing problems. This deficiency leads to the overactive breakdown of lung tissue, causing emphysema and other respiratory issues.
Match: A-III (Emphysema is caused by the deficiency of -1 antitrypsin).

B. Cry IAb:
Cry IAb is a toxin derived from the bacterium *Bacillus thuringiensis* (Bt). This toxin is used as a biopesticide and is particularly effective in controlling the cotton bollworm, a pest that damages cotton crops. Cry IAb works by disrupting the digestive system of the pest, leading to its death.
Match: B-IV (Cry IAb is used to control Cotton bollworm).

C. Cry IA:c:
This is another toxin produced by *Bacillus thuringiensis* but is specifically effective against the corn borer, a major pest that affects maize (corn). The toxin works similarly to Cry IAb, disrupting the pest’s digestive system and killing it.
Match: C-I (Cry IA:c is used to control Corn borer).

D. Enzyme replacement therapy:
Enzyme replacement therapy (ERT) is used in the treatment of diseases like ADA (Adenosine deaminase) deficiency. ADA deficiency leads to severe combined immunodeficiency (SCID), where the immune system does not function properly. ERT involves administering the missing enzyme to help restore immune function in patients with ADA deficiency.
Match: D-II (Enzyme replacement therapy is used to treat ADA deficiency).

Step 2: Conclusion:

The correct matches are as follows:

• A - III: -1 antitrypsin deficiency causes emphysema.
• B - IV: Cry IAb is used to control the Cotton bollworm.
• C - I: Cry IA:c is used to control the Corn borer.
• D - II: Enzyme replacement therapy is used to treat ADA deficiency.

Answer: The correct answer is (3) A-III, B-IV, C-I, D-II.