13.1.3b The World of Microorganisms (MCQ-Hard)

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A certain bacterium is observed transferring a plasmid to another bacterium through a pilus during a period of environmental stress. What is the primary biological advantage of this specific process?
- It allows for rapid population doubling through asexual means.
- It increases genetic diversity, potentially providing traits for survival.
- It triggers the immediate formation of a protective endospore.
- It enables the bacteria to switch from heterotrophic to autotrophic nutrition.
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Question 2 of 5

2. Question
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Fungi are known for their extracellular digestion. Which of the following best describes the sequence of events in this process?
- Engulfing organic matter via phagocytosis, followed by internal lysosomal breakdown.
- Secreting enzymes onto the substrate, followed by the absorption of dissolved nutrients.
- Synthesizing glucose from atmospheric carbon dioxide using energy from chemical reactions.
- Capturing sunlight through hyphae to power the assembly of amino acids.
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Question 3 of 5

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A patient completes a heavy course of broad-spectrum antibiotics and subsequently develops a secondary fungal infection. Based on the concept of normal flora, what is the most likely cause?
- The antibiotics acted as a nutrient source for the fungal spores.
- The reduction of beneficial bacteria decreased competition for space and nutrients.
- The fungi mutated into a more aggressive form to survive the antibiotic treatment.
- The antibiotics directly stimulated the maturation of fungal reproductive structures.
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Protozoa like Paramecium sp. living in freshwater environments possess contractile vacuoles. What would happen if these vacuoles failed to function?
- The cell would lose too much water and shrink through plasmolysis.
- The cell would be unable to produce energy due to a lack of oxygen.
- The cell would swell and eventually burst due to uncontrolled water entry.
- The cell would immediately begin performing photosynthesis to survive.
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Viruses are often described as being at the edge of life. Which piece of evidence best supports the classification of viruses as non-living when outside a host cell?
- They contain genetic material in the form of DNA or RNA.
- They lack an independent metabolism and cannot generate their own energy.
- They are capable of causing infectious diseases in humans.
- They possess a protein coat known as a capsid.
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13.1.3b The World of Microorganisms (MCQ-Hard)

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