Question

which type of bacteria can be found in pairs, chains, squares of four, cubes of eight, or grapelike clusters?
coccus
bacillus
spinllum
pili

Explanation:

• Coccus: Spherical bacteria. Can form pairs (diplococci), chains (streptococci), squares of four (tetrads), cubes of eight (sarcinae), or grapelike clusters (staphylococci).
• Bacillus: Rod - shaped bacteria. Usually do not form such complex clustered arrangements as described in the question.
• Spirillum: Spiral - shaped bacteria. Their shape and structure are different from what is asked.
• Pili: These are hair - like appendages on bacteria, not a type of bacteria.

Answer:

coccus