Phylum Firmicutes include
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- Low G+C, Gram-positive bacteria
- High G+C, Gram-positive bacteria
- Low G+C, Gram-negative bacteria
- High G+C, Gram-negative bacteria
The Correct Option is A
Solution and Explanation
Bacterial systematics classifies Gram-positive eubacteria into major phyla based on genomic Guanine-plus-Cytosine (G+C) base composition.
Step 2: Detailed Explanation:
The phylum Firmicutes (Latin firmus, strong; cutis, skin) comprises Gram-positive bacteria characterized by low genomic G+C content ($< 50\,\text{mol}\%$), including endospore-forming genera such as Bacillus and Clostridium, as well as Lactobacillus, Streptococcus, and Staphylococcus.
In contrast, Gram-positive bacteria with high G+C content ($> 50\,\text{mol}\%$) are classified in the phylum Actinobacteria.
Step 3: Final Answer:
Therefore, the phylum Firmicutes includes Low G+C, Gram-positive bacteria.
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