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BIO503 PAST PAPERS
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Primary and secondary active transport
rely on different energy sources
There are two main types of active transport processes:
Primary active transport requires the direct participation of energy-rich ATP.
Secondary active traffic does not use ATP directly;
Instead, its energy is supplied by a gradient of ion concentration established by primary active transport. In primary active transport, the energy released by the hydrolysis of ATP induces movement against specific ions.
A concentration gradient, for example, if we compare
Concentrations of potassium ions (K+) and sodium ions (Na+)
Inside a nerve cell and in the fluid that bathes the nerve, K+
The concentration is higher inside the cell, whereas Na+
Concentration is more on the outside. However, nerve cells have a protein Na + out and K + in. continues to inject
This ensures that the slope is maintained, as opposed to the concentration gradient. This sodium-potassium (Na+-K+) pump.
It is found in all animal cells and is an integrated glycoprotein membrane. It breaks down the ATP molecule into ADP
phosphate (Pi) and two K+. uses the energy released to move
ions and three Na+ ions into the cell.
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