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The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient (this is a hydrogen ion H+ gradient), established via breakdown of ATP for energy, across the membrane-more acidic outside the cell than inside the cell. Phosphate transport may best described as an example of O cotransport or secondary active transport O facilitated diffusion O active transport O passive diffusion O osmosis

The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient (this is a hydrogen ion H+ gradient), established via breakdown of ATP for energy, across the membrane-more acidic outside the cell than inside the cell. Phosphate transport may best described as an example of O cotransport or secondary active transport O facilitated diffusion O active transport O passive diffusion O osmosis

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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**Phosphate Transport Mechanism in Bacteria** The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient (this is a hydrogen ion H+ gradient), established via breakdown of ATP for energy, across the membrane—more acidic outside the cell than inside the cell. Phosphate transport may best be described as an example of _____. - O cotransport or secondary active transport - O facilitated diffusion - O active transport - O passive diffusion - O osmosis **Explanation:** This text discusses how bacteria are able to transport phosphate ions into the cell against the concentration gradient. The process relies on energy derived from the pH gradient that is generated by the breakdown of ATP, with more acidity (higher concentration of H+ ions) outside the cell. This is a classic example of active transport since it involves moving substances against the concentration gradient using energy. The options listed represent different types of transport mechanisms: secondary active transport (or cotransport) uses similar energy principles, while facilitated diffusion, passive diffusion, and osmosis differ by not needing energy in such a context. **Diagram Details:** No diagrams or graphs are present in the text provided. The focus is entirely on the explanation of the phosphate transport process.
Transcribed Image Text:**Phosphate Transport Mechanism in Bacteria** The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient (this is a hydrogen ion H+ gradient), established via breakdown of ATP for energy, across the membrane—more acidic outside the cell than inside the cell. Phosphate transport may best be described as an example of _____. - O cotransport or secondary active transport - O facilitated diffusion - O active transport - O passive diffusion - O osmosis **Explanation:** This text discusses how bacteria are able to transport phosphate ions into the cell against the concentration gradient. The process relies on energy derived from the pH gradient that is generated by the breakdown of ATP, with more acidity (higher concentration of H+ ions) outside the cell. This is a classic example of active transport since it involves moving substances against the concentration gradient using energy. The options listed represent different types of transport mechanisms: secondary active transport (or cotransport) uses similar energy principles, while facilitated diffusion, passive diffusion, and osmosis differ by not needing energy in such a context. **Diagram Details:** No diagrams or graphs are present in the text provided. The focus is entirely on the explanation of the phosphate transport process.
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In the small intestine, phosphate is absorbed via at least two separate mechanisms: paracellular phosphate transport, which is based on passive diffusion, and active transport, which occurs via sodium-dependent phosphate cotransporters.

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