Which of the following correctly describes the first event in bacterial sporulation?

• A. DNA replication and axial filament formation
• B. Deposition of cortex and spore coat layers
• C. Engulfment of the forespore by the mother cell
• D. Release of the mature endospore from the mother cell

Answer: (A)

Verified step by step guidance

1. Understand that bacterial sporulation is a complex, multi-step process that allows certain bacteria to form highly resistant endospores under unfavorable conditions.
2. Identify the sequence of events in sporulation, starting from the initial trigger to the final release of the mature spore.
3. Recognize that the very first event involves the bacterial cell preparing its genetic material for segregation, which includes DNA replication and the formation of the axial filament, a structure that helps organize the duplicated chromosomes.
4. Note that subsequent steps include engulfment of the forespore by the mother cell, deposition of protective layers such as the cortex and spore coat, and finally the release of the mature endospore.
5. Therefore, the first event is correctly described as DNA replication and axial filament formation, setting the stage for the rest of the sporulation process.