Question

multiple choice question
which of the following describes the chemical modification of a molecule as it is transported into a bacterial cell?

• passive diffusion
• primary active transport
• secondary transport
• group translocation

Explanation:

• Passive diffusion: Molecules move down concentration gradient without modification or energy. Eliminate.
• Primary active transport: Uses energy (e.g., ATP) to move molecules, no chemical modification. Eliminate.
• Secondary transport: Uses ion gradient energy, no chemical modification. Eliminate.
• Group translocation: During transport into bacterial cells, molecules (e.g., sugars) are chemically modified (e.g., phosphorylated) as they cross the membrane. This matches the description.

Answer:

D. Group translocation