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MCB2340C GENERAL MICROBIOLOGY COMPLETED EXAM WITH RATIONALES 2024
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MCB2340C GENERAL MICROBIOLOGY COMPLETED EXAM WITH RATIONALES 2024
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MCB2340CGeneral Microbiology
COMPLETED EXAM w/
RATIONALES
2024
,1. Define phototrophy and explain its significance in
biological systems.
Answer: Phototrophy is the process by which organisms
harness energy from light to drive metabolic reactions. This
is significant as it enables the synthesis of organic
compounds necessary for growth and survival.
Rationale: This question tests the students' understanding
of the basic concept of phototrophy and its role in
biological systems.
2. Discuss the difference between phototrophs and
chemotrophs in terms of energy acquisition and metabolic
processes.
Answer: Phototrophs obtain energy from light, whereas
chemotrophs obtain energy from the oxidation of organic
or inorganic compounds. Metabolic processes in
phototrophs involve photosynthesis, while chemotrophs
employ various enzymatic reactions for energy acquisition.
Rationale: This question aims to assess students' ability to
differentiate between phototrophs and chemotrophs based
on energy acquisition and metabolic processes.
, 3. Describe the structure and function of chlorophyll in
phototrophic organisms.
Answer: Chlorophyll is a pigment found in phototrophic
organisms that facilitates the absorption of light energy. It
consists of a porphyrin ring structure, which absorbs light,
and a hydrophobic tail that aids in its integration into
photosynthetic membranes.
Rationale: This question evaluates students' understanding
of the role of chlorophyll and its structural features in
facilitating light absorption.
4. Explain the difference between oxygenic and anoxygenic
photosynthesis and provide examples of organisms that
perform each.
Answer: Oxygenic photosynthesis generates oxygen as a
byproduct, and examples of organisms performing this
process include cyanobacteria, algae, and higher plants.
Anoxygenic photosynthesis does not produce oxygen and
is carried out by certain bacteria such as purple bacteria and
green sulfur bacteria.
Rationale: This question assesses the students' knowledge
of the distinction between oxygenic and anoxygenic
photosynthesis, along with providing specific examples of
organisms.
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