Recent advances and challenges in marine drug research MCQs With Answer
This collection of multiple-choice questions is designed for M.Pharm students studying Advanced Pharmacognosy I (MPG 102T). It focuses on recent technological advances — such as genome mining, metabolomics, molecular networking (GNPS), single-cell and metagenomic approaches — and real-world challenges including sustainable supply, cultivation of uncultured microbes, complex synthetic routes, and legal/ethical frameworks like the Nagoya Protocol. Questions emphasize practical applications (heterologous expression, synthetic biology, dereplication) and examples of approved marine-derived drugs, testing both conceptual understanding and applied problem-solving skills necessary for contemporary marine natural product research.
Q1. Which marine source has been recognized recently as a prolific origin of bioactive natural products due to its diverse microbial symbionts?
- Free-living marine algae only
- Marine sponges and their microbial symbionts
- Pelagic fish gut microbiota exclusively
- Deep-sea hydrothermal vent fish
Correct Answer: Marine sponges and their microbial symbionts
Q2. Which approved marine-derived drug is a potent analgesic derived from a cone snail peptide?
- Trabectedin (Yondelis)
- Ziconotide (ω-conotoxin MVIIA)
- Eribulin (Halaven)
- Aplidin (Plitidepsin)
Correct Answer: Ziconotide (ω-conotoxin MVIIA)
Q3. What computational/analytical platform is widely used today for dereplication and visualization of MS/MS spectral relationships across datasets?
- antiSMASH genome browser
- GNPS molecular networking
- BLAST protein alignment
- KEGG pathway mapper
Correct Answer: GNPS molecular networking
Q4. Which bioinformatics tool is primarily used to predict biosynthetic gene clusters (BGCs) from microbial genome sequences?
- MetFrag
- antiSMASH
- MS-DIAL
- STRING
Correct Answer: antiSMASH
Q5. Which experimental strategy is effective for activating cryptic or silent biosynthetic gene clusters in marine microorganisms?
- High-dose antibiotic treatment only
- Co-culture and epigenetic modulation
- Exposure to sunlight for prolonged periods
- Serial dilution plating on minimal media exclusively
Correct Answer: Co-culture and epigenetic modulation
Q6. Which of the following remains a primary translational challenge for marine natural products progressing to clinical development?
- Excessively simple molecular scaffolds
- Limited sustainable supply and complex total synthesis
- Too many human safety data from preclinical studies
- Abundance of low-cost large-scale fermentation methods
Correct Answer: Limited sustainable supply and complex total synthesis
Q7. Which microbial host is frequently chosen for heterologous expression of large marine polyketide or nonribosomal peptide gene clusters?
- Escherichia coli only
- Streptomyces species
- Human HEK293 cells
- Vibrio fischeri exclusively
Correct Answer: Streptomyces species
Q8. Which analytical platform is most suitable for high-resolution metabolomics and structural dereplication of complex marine extracts?
- GC-FID without MS
- LC-MS/MS-based metabolomics
- Paper chromatography
- UV–Vis spectrophotometry alone
Correct Answer: LC-MS/MS-based metabolomics
Q9. Eribulin (Halaven) is a clinically approved anticancer agent derived from which marine natural product class or precursor?
- Synthetic peptide unrelated to marine sources
- Halichondrin B (a sponge-derived macrolide precursor)
- Dinoflagellate saxitoxin derivatives
- Marine algal polysaccharide
Correct Answer: Halichondrin B (a sponge-derived macrolide precursor)
Q10. How does chemical ecology contribute to prioritizing organisms for marine drug discovery?
- By predicting only nutritional components of organisms
- By identifying organisms that produce ecological bioactive metabolites used for defense or signaling
- By eliminating all organisms that live in symbiosis
- By cataloging only pigment molecules
Correct Answer: By identifying organisms that produce ecological bioactive metabolites used for defense or signaling
Q11. Which international instrument primarily governs access and benefit-sharing for genetic resources within national jurisdictions relevant to marine bioprospecting?
- The Paris Agreement
- The Nagoya Protocol
- The Montreal Protocol
- The Basel Convention
Correct Answer: The Nagoya Protocol
Q12. Which cutting-edge approach enables genomic analysis of individual uncultured marine microbial cells to link taxonomic identity with biosynthetic potential?
- Bulk shotgun metagenomics only
- Single-cell genomics and single-cell amplified genomes (SAGs)
- Traditional culture-based taxonomy alone
- Environmental scanning electron microscopy
Correct Answer: Single-cell genomics and single-cell amplified genomes (SAGs)
Q13. What technological advance has most improved throughput and reduced reagent costs for functional screening of marine microbes and extracts?
- Large-format petri-dish assays only
- Microfluidics and droplet-based high-throughput screening
- Manual 96-well pipetting without automation
- Paper-based assays exclusively
Correct Answer: Microfluidics and droplet-based high-throughput screening
Q14. A common limitation of bioassay-guided fractionation in marine natural product discovery is:
- Absolute elimination of known compounds by default
- Risk of repeatedly rediscovering known compounds (dereplication failure)
- Inability to detect any cytotoxic compounds
- Guaranteed success in scaling up production
Correct Answer: Risk of repeatedly rediscovering known compounds (dereplication failure)
Q15. Which synthetic chemistry challenge often hinders the scalable total synthesis of complex marine natural products?
- Low stereochemical complexity
- High stereochemical complexity and fragile functional groups
- Excess of commercially available starting materials
- Simplicity of the macrocyclization steps
Correct Answer: High stereochemical complexity and fragile functional groups
Q16. What is a principal advantage of genome mining in marine drug discovery?
- It eliminates the need for any chemical analysis
- It predicts novel biosynthetic gene clusters and guides targeted compound discovery
- It guarantees immediate large-scale production of compounds
- It focuses only on known secondary metabolites
Correct Answer: It predicts novel biosynthetic gene clusters and guides targeted compound discovery
Q17. Plitidepsin (Aplidin), investigated for antiviral and anticancer activity, is originally isolated from which marine source?
- Marine sponge species of genus Halichondria
- Tunicate (ascidian) of the genus Aplidium
- Deep-sea bacterium from hydrothermal vents
- Brown macroalgae of the genus Laminaria
Correct Answer: Tunicate (ascidian) of the genus Aplidium
Q18. Which integrative approach links genomic biosynthetic predictions to observed metabolites by correlating BGC presence with LC-MS features?
- Proteomics-only workflows
- Metabologenomics (integrating genomics and metabolomics)
- Classical pharmacognosy without instrumentation
- Radioimmunoassay-based mapping
Correct Answer: Metabologenomics (integrating genomics and metabolomics)
Q19. Beyond technical obstacles, which social/legal issue increasingly impacts marine drug discovery projects?
- Universal free access to all genetic resources without consent
- Access and benefit-sharing obligations with source countries and indigenous communities
- Complete absence of intellectual property concerns
- Guaranteed government funding for all marine bioprospecting
Correct Answer: Access and benefit-sharing obligations with source countries and indigenous communities
Q20. Which future direction is expected to accelerate marine drug discovery and scalable production of marine natural products?
- Abandoning synthetic biology in favor of pure wild harvesting
- Synthetic biology combined with AI-driven pathway design and optimization
- Exclusive reliance on random traditional extraction methods
- Stopping genomic sequencing of marine microbes
Correct Answer: Synthetic biology combined with AI-driven pathway design and optimization
