NPTEL Organ Printing Week 2 Assignment Answers 2024
1. Which bioprinting technique is known for its precise control of cell placement and high cell viability?
- Extrusion bioprinting
- Laser-assisted bioprinting
- Inkjet bioprinting
- Fused deposition modeling
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2. In Laser-induced Forward Transfer (LIFT), how are living cells transferred?
- Through a nozzle under pressure
- Using ink cartridges
- In a contact-free manner without damage
- Through electrospinning
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3. Which bioprinting technology provides the widest choice of materials?
- Inkjet printing
- Extrusion bioprinting
- Laser-assisted bioprinting
- Stereolithography
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4. How does Extrusion-based Bioprinting differ from Inkjet Bioprinting in terms of bioink delivery?
- Extrusion uses continuous strands, while Inkjet uses droplets
- Extrusion is contactless, while Inkjet requires contact
- Extrusion uses UV light, while Inkjet uses a laser
- Extrusion is limited to a single bioink, while Inkjet allows multiple materials
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5. Which bioprinting technology is generally considered the most expensive?
- Inkjet printing
- Extrusion bioprinting
- Laser-assisted bioprinting
- Fused deposition modeling
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6. Which bioprinting technique is best suited for printing high cell densities?
- Inkjet printing
- Extrusion bioprinting
- Laser-assisted bioprinting
- Stereolithography
Answer :-
7. In which laser-assisted bioprinting technique are low power laser pulses in the UV or near-UV wavelength used with a biopolymer sacrificial layer?
- AFA-LIFT
- LIFT
- MAPLE DW
- BioLP
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8. Which laser-assisted bioprinting technique uses an 800 nm laser beam coupled with hollow optical fibers to move cells in suspension?
- AFA-LIFT
- LG DW
- MAPLE DW
- LIFT
Answer :-
9. Arrange bioprinting technologies in terms of their capability to use biomaterials with increasing viscosities (Low to High):
- Inkjet > Extrusion > Laser-assisted
- Inkjet > Laser-assisted > Extrusion
- Extrusion > Inkjet > Laser-assisted
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10. Order the bioprinting technologies by their print speed from slowest to fastest:
- Inkjet > Extrusion > Laser-assisted
- Inkjet > Laser-assisted > Extrusion
- Extrusion > Laser-assisted > Inkjet
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11. What is the main role of the support bath in 3D Bioprinting?
- To provide structural integrity to the printed tissue construct
- To prevent cross-contamination between different bioinks
- To act as a barrier for maintaining a sterile bioprinting environment
- To provide mechanical support and reduce the effects of gravity during printing
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12. What is the primary consideration when selecting an optimal support bath for bioprinting?
- The bath’s ability to dissolve in various solvents and media
- The color and transparency of the support bath
- The density and melting point of the support bath material
- The printing temperature required for the chosen bioink
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13. What is the role of sacrificial materials in 3D bioprinting using a support bath?
- To act as a buffer to control pH during the printing process
- To serve as a nutrient-rich medium for cell growth
- To provide structural support during printing and dissolve post-printing
- To enhance cell adhesion to the substrate and prevent detachment
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14. How does Drop-on-Demand (DOD) Bioprinting differ from Continuous Inkjet (CIJ) Bioprinting?
- DOD uses a single bioink type, while CIJ allows multiple materials
- CIJ requires contact with the substrate, while DOD is non-contact
- DOD prints individual droplets, while CIJ prints continuous strands
- CIJ achieves higher printing speeds compared to DOD
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15. What is the function of the “ribbon” in Laser-assisted Bioprinting?
- It is a specialized nozzle that deposits the bioink on the substrate
- It acts as a transfer medium for cells and biomaterials during printing
- It supports the 3D printed tissue construct during post-printing handling
- It is a laser-scanning component that controls bioink spatial arrangement
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16. What makes Extrusion Bioprinting suitable for creating a bioartificial liver?
- Capability to print miniature functional liver lobules
- Compatibility with metallic inks for liver support structures
- High printing speed for large-scale liver constructs
- Ability to print conductive materials for liver-electrode interfaces
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17. The use of “cell sheets” in bioprinting is most closely associated with which approach?
- Layer-by-layer assembly
- Spheroid-based bioprinting
- Extrusion bioprinting
- Inkjet bioprinting
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18. In the context of 4D bioprinting, which property is essential for creating dynamic tissue constructs that can change shape or function over time?
- Biodegradability
- Shape-memory effect
- Electroconductivity
- Photoluminescence
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19. The “Kenzan method” in bioprinting is associated with which technique?
- Scaffold-free bioprinting
- Microextrusion bioprinting
- Laser-assisted bioprinting
- Electrohydrodynamic jet bioprinting
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20. Which advanced biomaterial shows promise for bioprinting load-bearing tissues due to its shear-thinning and self-healing properties?
- Poly(ethylene glycol) diacrylate (PEGDA)
- Nanocellulose
- Supramolecular hydrogels
- Silk fibroin
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