Problema 6 · Biología URV Practice Test: Biology and Genetics of Prokaryotes

1. What role does a bacteriophage play during generalized or specialized transduction?

Solución: b) Serving as a biological vector transferring bacterial chromosomal DNA between host cells

2. What early event occurs following the injection of virulent phage DNA into a host bacterium?

Solución: d) Host genomic DNA is cleaved and degraded by viral or activated nucleases

3. What represents the terminal stage of generalized transduction in the recipient cell?

Solución: b) Stable integration of the donor DNA fragment into the recipient's genome

4. Photoautotrophic microorganisms utilize _____ as their carbon source and _____ as their energy source:

Solución: b) Carbon dioxide (CO₂); solar radiation (sunlight)

5. Which nutritional characteristic defines chemoheterotrophic organisms?

Solución: c) Deriving both carbon and metabolic energy from organic compounds

6. How does anoxygenic photosynthesis fundamentally differ from oxygenic photosynthesis?

Solución: c) It operates without producing oxygen, typically functioning under anoxic or low-oxygen conditions

7. Which molecule provides reducing electrons in oxygenic photosynthesis?

Solución: b) Water (H₂O)

8. What chemical byproduct is typically deposited during anoxygenic photosynthesis using hydrogen sulfide?

Solución: b) Elemental sulfur (S⁰)

9. In oxygenic phototrophs, ATP and NADPH generated during light reactions are primarily consumed in:

Solución: b) The Calvin-Benson-Bassham cycle for CO₂ fixation