Final answer:
The features associated with both Staphylococci and Streptococci are being Gram-positive, producing hemolysin, and having a capsule. They do not produce endotoxin, which is typical of Gram-negative bacteria.
Step-by-step explanation:
The question is asking which features are associated with both Staphylococci and Streptococci. Options (a) Gram positive, (b) Hemolysin, (c) Endotoxin, and (d) Capsule are given to choose from. Staphylococci and Streptococci are both Gram-positive bacteria, which refers to their ability to retain the crystal violet stain used in the Gram staining procedure.
These bacteria can also produce hemolysins, which are enzymes that lyse red blood cells, a property observable on blood agar plates as a clear zone (or halo) surrounding colonies. Some Staphylococci and Streptococci have a capsule, a polysaccharide layer that can help them evade the host's immune system.
However, they do not produce endotoxin, which is a characteristic of Gram-negative bacteria. Therefore, the correct answer is D) a, b, and d – Gram positive, Hemolysin, and Capsule.