Which term describes backpack-shaped microorganisms?

Which term describes backpack-shaped microorganisms?

• A. Staphylococcus.
• B. Sarcina.
• C. Micrococcus.
• D. Diplococcus.

Answer: (B)

Cocci that arrange into a cubical, box-like packet are described by the term Sarcina. This distinctive cubic grouping comes from cocci forming packets of eight in a 2x2x2 arrangement, giving a compact, backpack-like appearance under the microscope. This morphology is a reliable clue to identify Sarcina among common Gram-positive cocci. In contrast, other cocci show different patterns: Staphylococcus clusters in grape-like, irregular groups; Micrococcus often appears in tetrads or other irregular clusters; and Diplococcus exists as pairs of cocci. The cube-shaped packet pattern is unique to Sarcina, which is why it’s the best descriptor for the backpack-like arrangement.

Cocci that arrange into a cubical, box-like packet are described by the term Sarcina. This distinctive cubic grouping comes from cocci forming packets of eight in a 2x2x2 arrangement, giving a compact, backpack-like appearance under the microscope. This morphology is a reliable clue to identify Sarcina among common Gram-positive cocci.

In contrast, other cocci show different patterns: Staphylococcus clusters in grape-like, irregular groups; Micrococcus often appears in tetrads or other irregular clusters; and Diplococcus exists as pairs of cocci. The cube-shaped packet pattern is unique to Sarcina, which is why it’s the best descriptor for the backpack-like arrangement.