Final answer:
Mycobacterium tuberculosis is classified as high G+C gram-positive bacteria, belonging to the class Actinobacteria, with more than 50% of guanine and cytosine in its DNA.
Step-by-step explanation:
Among the provided bacterial species, Mycobacterium tuberculosis is the one classified as high G+C gram-positive bacteria. This bacterium belongs to the class Actinobacteria, whose members have a high guanine (G) and cytosine (C) content in their DNA, accounting for more than 50%. The Actinobacteria class includes various genera notorious for being pathogens as well as beneficial to industry. Mycobacterium tuberculosis is a notable human pathogen responsible for causing the disease tuberculosis.
Contrastingly, Staphylococcus aureus, Bacillus cereus, and Clostridium botulinum are examples of low G+C gram-positive bacteria. Their DNA contains less than 50% guanine and cytosine nucleotides. These bacteria belong to the class Bacilli, and while they are also medically significant, they must be categorized differently based on their nucleic acid content.