Which of the following would be a final electron acceptor for anaerobic respiration?
oxygen
pyruvic acid
glucose (C6H12O6)
nitrate (NO3)
The Correct Answer is D
A. Oxygen: Oxygen is the final electron acceptor in aerobic respiration, not in anaerobic respiration.
B. Pyruvic acid: Pyruvic acid can act as an electron acceptor in certain fermentation pathways but is not the common terminal electron acceptor in anaerobic respiration processes that use inorganic acceptors.
C. Glucose (C₆H₁₂O₆): Glucose is the initial electron donor/substrate for catabolism, not a terminal electron acceptor.
D. Nitrate (NO₃⁻): Nitrate is an inorganic molecule commonly used as a terminal electron acceptor by many bacteria during anaerobic respiration (denitrification or nitrate reduction).
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Related Questions
Correct Answer is {"dropdown-group-1":"D","dropdown-group-2":"C","dropdown-group-3":"A","dropdown-group-4":"B"}
Explanation
|
Description |
Correct Growth Phase |
Rationale |
|
Cells die at a high rate |
4. Death phase |
In this phase, nutrients are depleted and toxic waste accumulates, leading to a decline in viable cell numbers as death exceeds new cell formation. |
|
Cells are produced at the highest rate |
3. Log phase (Exponential phase) |
Cells divide at their maximum rate, population size doubles regularly, and growth rate is logarithmic. This phase is used to test antibiotics and measure generation time. |
|
Cells adjust to their environment |
1. Lag phase |
Bacteria are metabolically active but not dividing. They are synthesizing enzymes and preparing for cell division. |
|
New cells are produced at the same rate that old cells die |
2. Stationary phase |
The growth curve levels off as nutrient depletion and waste buildup balance cell division and death rates. Population size remains constant. |
Correct Answer is D
Explanation
A. Parasitic: A parasitic relationship benefits the microbe at the host’s expense and typically causes harm; producing vitamin K for the host does not fit the parasitic definition.
B. Saprobic: Saprobic organisms obtain nutrients from dead or decaying organic matter (decomposers); intestinal E. coli living on host-derived substrates and contributing vitamins are not acting as saprobes.
C. Antagonistic: Antagonistic interactions involve one organism inhibiting another (competition or antimicrobial production); the described vitamin-producing relationship does not reflect antagonism.
D. Mutualistic: Mutualism describes a relationship where both partners benefit — E. coli gains a habitat and nutrients while the host gains vitamin K — which fits this scenario.
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