Question

In a drug discovery process:
1. Lead optimization
2. Target selection
3. Lead findings

• A. 3-2-1
• B. 1-2-3
• C. 2-3-1
• D. 3-1-2

Hint:

In drug discovery: Identify the target (2), find a lead compound (3), and optimize it (1) for better activity and safety.

Answer 1

The Correct Option is C

- Drug discovery is a step-wise process that begins with identifying the biological origin of the disease, followed by screening and optimizing chemical candidates.
- The first step is Target Selection, where a biological molecule (usually a protein) involved in a disease is chosen as a potential site for drug action. This target should be validated to confirm its role in the disease.
- The next step is Lead Finding, which involves screening of chemical libraries or natural sources to identify compounds (leads) that show biological activity against the selected target.
- The final step in this sequence is Lead Optimization, where the chemical structure of lead compounds is modified to enhance potency, selectivity, pharmacokinetics, and reduce toxicity.
- Hence, the correct order in the drug discovery process is:
Target Selection → Lead Finding → Lead Optimization = 2-3-1

Answer 2

The question lists three stages of drug discovery, lead optimization, target selection, and lead finding, and asks for the order in which they actually happen. Let's check each proposed sequence against how a real drug discovery program is run.

1. 3-2-1 (Lead findings, Target selection, Lead optimization): This would mean researchers find lead compounds before they have even chosen a biological target to test them against. Without a target, there is nothing to screen the compounds for activity on, so this order does not make sense.
2. 1-2-3 (Lead optimization, Target selection, Lead findings): This places optimization first, before any lead compound has even been identified. There is nothing to optimize until a lead exists, so this sequence is backwards.
3. 2-3-1 (Target selection, Lead findings, Lead optimization): A target protein linked to the disease is chosen and validated first. Chemical libraries are then screened against that target to find lead compounds showing activity. Finally, those leads are chemically modified to improve potency, selectivity, and safety. This order matches how drug discovery programs are actually run.
4. 3-1-2 (Lead findings, Lead optimization, Target selection): This has leads being optimized before a target is even selected, which is not logically possible since optimization is judged against activity on a specific target.

Only the sequence that starts with choosing a target, then finding leads against it, then optimizing those leads, reflects the real drug discovery pipeline.

So the correct answer is 2-3-1.