Upon inoculation into a new culture, bacteria cells will immediately start to grow exponentially.
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The Correct Answer is A
Upon inoculation into a new culture, bacteria do not immediately enter exponential growth. Initially, they enter the lag phase, a period of metabolic adjustment where cells synthesize necessary enzymes, repair cellular components, and adapt to the new environment. During this phase, there is little to no increase in cell number, but metabolic activity is high. Only after this adaptation period do the bacteria enter the logarithmic (exponential) phase, where rapid cell division occurs. The length of the lag phase depends on factors such as the physiological state of the inoculum, nutrient availability, and environmental conditions.
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Correct Answer is B
Explanation
If a bacterial molecule uses SO₄²⁻ (sulfate) as its final electron acceptor, the process is anaerobic, not aerobic. Aerobic respiration specifically requires oxygen (O₂) as the terminal electron acceptor in the electron transport chain. In contrast, certain bacteria can perform anaerobic respiration, using alternative electron acceptors such as sulfate, nitrate, or carbon dioxide. In sulfate-reducing bacteria, sulfate is reduced to hydrogen sulfide (H₂S) during energy production, allowing ATP synthesis in the absence of oxygen. Therefore, using sulfate as the terminal electron acceptor defines an anaerobic metabolic pathway.
Correct Answer is A
Explanation
A. Coccus: A coccus is a spherical or round-shaped bacterium. Cocci can exist singly, in pairs (diplococci), chains (streptococci), clusters (staphylococci), or other arrangements depending on their pattern of division. The shape is an important morphological characteristic used in bacterial identification and classification in clinical microbiology.
B. Bacillus: A bacillus refers to a rod-shaped bacterium. Bacilli can occur singly or in chains and may be aerobic or anaerobic. Their elongated shape distinguishes them from cocci and influences how they move, attach to surfaces, and form spores.
C. Vibrio: A vibrio is a comma-shaped or curved rod-shaped bacterium. Vibrio species, such as Vibrio cholerae, are typically associated with aquatic environments and have distinct motility patterns. Their curved morphology differentiates them from cocci and bacilli.
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