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Questions and Answers
What type of energy do cells typically use in active transport mechanisms?
What type of energy do cells typically use in active transport mechanisms?
- Glucose
- Nicotinamide adenine dinucleotide (NADH)
- Flavin adenine dinucleotide (FADH2)
- Adenosine triphosphate (ATP) (correct)
In active transport, how does the movement of substances across the cell membrane occur relative to the concentration gradient?
In active transport, how does the movement of substances across the cell membrane occur relative to the concentration gradient?
- Along the concentration gradient
- Only within the extracellular fluid
- Against the concentration gradient (correct)
- With no regard to the concentration gradient
Which of the following is not typically moved by active transport mechanisms?
Which of the following is not typically moved by active transport mechanisms?
- Larger molecules
- Small-molecular weight materials
- Ions
- Intracellular organelles (correct)
What is a unique capability of some cells involving active transport?
What is a unique capability of some cells involving active transport?
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Which among the following best describes active transport in terms of energetic cost to the cell?
Which among the following best describes active transport in terms of energetic cost to the cell?
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Study Notes
Active Transport
- Active transport mechanisms require the use of the cell's energy, usually in the form of ATP.
- Energy is needed to move substances into the cell against their concentration gradient.
- This means that the concentration of the substance inside the cell must be greater than its concentration in the extracellular fluid.
- Active transport mechanisms can 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 through active transport.
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Description
Learn about active transport mechanisms that require the use of cell energy, usually in the form of ATP, to move substances into the cell against their concentration gradient.
