Membranes and Transport Worksheet

Membranes and Transport

Read each question carefully and answer to the best of your ability. Refer to the provided diagrams where applicable.

1. Which component of the cell membrane is primarily responsible for its selective permeability?

2. Which type of transport moves substances against their concentration gradient, requiring energy?

1. The fluid mosaic model describes the cell membrane as a mosaic of   and   that are able to move fluidly within the bilayer.

2. Water moves across a semipermeable membrane from an area of high water concentration to an area of low water concentration by a process called  .

3. The Na+/K+ pump is an example of   transport, as it requires ATP to move ions against their concentration gradients.

1. Briefly explain the role of cholesterol in the cell membrane.

2. Differentiate between passive and active transport, providing an example of each.

Observe the diagram of the cell membrane below and answer the questions.

1. Identify two components labeled in the diagram that are integral proteins.

2. Based on the diagram, explain how the arrangement of phospholipids contributes to the membrane's function.

1. Facilitated diffusion requires energy in the form of ATP.

2. Endocytosis is a process where substances exit the cell.