Question

active and passive transport (worksheet)
q.1. write t or true if the statement is true; write f or false if the statement is false.

1. all cells have a cell membrane.
2. all molecules are always in motion.
3. when equilibrium is reached in diffusion, the movement of particles stops across the cell membrane.
4. in passive transport, particles always move from areas of higher concentration to areas of lower concentration without the use of energy.
5. active transport does not require energy to proceed.

q.2. use the words in the box to label terms in the model illustrated below.
facilitated diffusion, diffusion, active transport, passive transport
q.3. which of the following is not a type of passive transport?
a) diffusion b) endocytosis c) facilitated diffusion d) osmosis
q.4. which of the following substances cannot pass through the cell membranes by simple diffusion?
a) glucose b) oxygen c) carbon dioxide d) water

Explanation:

1. All cells are surrounded by a cell - membrane, so it's true.
2. Molecules have kinetic energy and are always in motion, so it's true.
3. At equilibrium in diffusion, particles still move but there is no net movement, so it's false.
4. Passive transport is from high to low concentration without energy use, so it's true.
5. Active transport requires energy (ATP) to move particles against the concentration gradient, so it's false.

For Q.2, from left to right (down the concentration gradient without energy and no protein channel) is Diffusion; with protein channel and down the concentration gradient is Facilitated Diffusion; both are Passive Transport. Against the concentration gradient with energy use is Active Transport.
For Q.3, Endocytosis is an active process (cell membrane engulfs substances), while diffusion, facilitated diffusion, and osmosis are passive.
For Q.4, Glucose is a large polar molecule and cannot pass through the non - polar cell membrane by simple diffusion, while oxygen, carbon dioxide, and water can.

Answer:

Q.1:

1. T
2. T
3. F
4. T
5. F

Q.2: Left to right: Diffusion, Facilitated Diffusion, Passive Transport, Active Transport
Q.3: b) Endocytosis
Q.4: a) Glucose