Discussion

Choose the correct match for structural components of bacteria to their function.

Answer: B

The correct match is (P)-(ii), (Q)-(i), (R)-(iii), (S)-(iv).

Flagella drive motility, which lets bacteria move toward attractants and away from repellents in chemotaxis (ii).
The peptidoglycan cell wall resists the internal osmotic pressure and prevents cell lysis (i).
Metachromatic (volutin) granules are stores of polyphosphate, the phosphate reserve used for ATP synthesis, which the paper calls storage for ATP (iii).
Magnetosomes are chains of magnetite crystals that orient the cell along the Earth's magnetic field (iv).

Option A gives the cell wall a storage role, option C swaps the granules and magnetosomes, and option D gives flagella the job of preventing lysis.

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