Which arrangement describes bacteria that grow in long chains?

• A. Diplo
• B. Strepto
• C. Cocci
• D. Staphylo

Answer: (B)

Long-chain arrangement happens when bacterial cells divide and stay attached end-to-end in a single plane, forming a string of cells. This pattern is described by strepto. In contrast, diplo means two cells together after division, cocci refers to the spherical shape of the cells, and staphylo describes grape-like clusters formed when division occurs in multiple planes. An example is Streptococcus, where cocci line up in chains. So, recognizing that chaining results from division in one plane helps you identify the term that describes this arrangement.