Worksheet: Active Transport
In this worksheet, we will practice describing the process of active transport, and giving examples of substances being actively transported.
What biological process produces the energy required for active transport?
Which of the following statements best describes transport between soil and root hair cells?
- ARoot hair cells take in water by osmosis and mineral ions by diffusion.
- BRoot hair cells take in water and mineral ions by active transport.
- CRoot hair cells take in water and mineral ions by diffusion.
- DRoot hair cells take in water by osmosis and mineral ions by active transport.
- ERoot hair cells take in water by diffusion and mineral ions by active transport.
Which of the following statements does not apply to active transport?
- AIt occurs across cell membranes.
- BIt is a passive process.
- CIt moves substances against their concentration gradient.
- DIt moves substances from a low to a high concentration.
- EIt requires energy (ATP).
Which of the following statements about the transport of substances is not correct?
- AActive transport requires energy.
- BOsmosis happens across a partially permeable membrane.
- CDiffusion and osmosis move substances down their concentration gradient.
- DDiffusion requires carrier proteins.
- EDiffusion and osmosis are passive processes.
How do carrier proteins help actively transport substances across cell membranes?
- ACarrier proteins dissolve substances so they can pass through a cell membrane by osmosis.
- BCarrier proteins use energy to change shape and carry substances across a cell membrane.
- CCarrier proteins bend the cell membrane to fit around substances.
- DCarrier proteins make gaps in the membrane so substances can diffuse through.
- ECarrier proteins bind substances using hydrogen bonds.
In the human body, the concentration of glucose can be higher in the blood than it is in the small intestines. Why is active transport beneficial here?
- AGlucose can be moved into the small intestines down the concentration gradient and used by respiring cells.
- BGlucose is insoluble, and left in the intestines, it will cause blockages.
- CGlucose can be moved into the blood against the concentration gradient and taken to respiring muscles.
- DGlucose can become toxic if too much is left in the intestines.
Which of the diagrams given best represents the movement of particles in active transport?