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Questions and Answers
What kind of energy do active transport mechanisms typically require?
What kind of energy do active transport mechanisms typically require?
- Oxygen
- Glucose
- Adenosine triphosphate (ATP) (correct)
- Carbon dioxide
In what scenario does a cell need to use active transport?
In what scenario does a cell need to use active transport?
- When moving substances down their concentration gradient
- When the cell is conserving energy
- When moving substances against their concentration gradient (correct)
- When passive transport is active
What types of materials do active transport mechanisms move?
What types of materials do active transport mechanisms move?
- Only liquids
- Only gases
- Small-molecular weight material and larger molecules (correct)
- Only large molecules
Why must the cell use energy to move substances via active transport?
Why must the cell use energy to move substances via active transport?
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Which of the following is a capability of some cells related to active transport?
Which of the following is a capability of some cells related to active transport?
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Study Notes
Active Transport Mechanisms
- Active transport requires the use of the cell's energy, typically in the form of adenosine triphosphate (ATP).
- Active transport is necessary when a substance must move into the cell against its concentration gradient, resulting in a higher concentration inside the cell than in the extracellular fluid.
- Energy is used to move substances into the cell against their concentration gradient.
- Some active transport mechanisms move small-molecular weight material, such as ions, through the membrane.
- Cells also need to remove and take in larger molecules and particles through active transport.
- Some cells are capable of engulfing entire unicellular microorganisms, a process that requires active transport.
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