Practice Movement Of Substances Against The Concentration Gradient Using Energy (atp). (6.3.1)

Practice: Movement of substances against the concentration gradient using energy (ATP).

Lesson 6.3.1Cell Biology

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6 sample questions

Question 1.
Define active transport.
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Include the direction, the energy source and the membrane.
Question 2.
Where does the energy for active transport come from?
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Which organelle releases energy from glucose?
3Question 3.
Which description fits active transport?
- Movement from low to high concentration using energy
- Movement from high to low concentration without energy
- Movement of water only through a membrane
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It goes 'uphill'.
4Question 4.
Which molecule directly supplies the energy for active transport?
- ATP
- DNA
- Starch
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It is made in respiration and acts as the cell's energy currency.
Question 5.
Plan an investigation into how temperature affects the uptake of potassium ions by plant roots. State the variables, describe how you would collect the data, predict the results and explain your prediction.
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Remember that active transport depends on proteins and on respiration, and both are affected by temperature.
Question 6.
The sodium-potassium pump runs constantly in every nerve cell. Explain why the pump is essential, and predict what would happen to a nerve cell if the pump stopped.
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Think about what keeps the gradients in place, and what happens to gradients when nothing maintains them.

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