Question

select all that apply
which of the following are transport mechanisms used by bacteria to take in nutrients? more than one answer may be correct.

• secondary active transport
• facilitated diffusion
• passive diffusion
• osmosis

Explanation:

• Secondary active transport: Bacteria use secondary active transport to move nutrients against their concentration gradient, utilizing the energy from an ion gradient (e.g., proton motive force) to transport substances like sugars and amino acids.
• Facilitated diffusion: This mechanism involves transport proteins (permeases) that help move nutrients across the bacterial membrane down their concentration gradient, useful for molecules that can't passively diffuse.
• Passive diffusion: Small, non - polar molecules (e.g., some gases, water - soluble vitamins in some cases) can pass through the bacterial membrane via passive diffusion, moving from an area of high to low concentration.
• Osmosis: While osmosis is mainly the movement of water, water is a vital nutrient - related substance for bacteria. Bacteria regulate water intake and loss via osmosis to maintain turgor and cellular functions, and water is essential for nutrient transport and metabolic reactions within the cell.

Answer:

A. Secondary active transport
B. Facilitated diffusion
C. Passive diffusion
D. Osmosis