Chapter 7 Key Concepts

Question 1

7.1

Answer 1

Cellular membranes are fluid mosaics of lipids and proteins

Question 2

7.2

Answer 2

Membrane structure results in selective permeability

Question 3

7.3

Answer 3

Passive transport is diffusion of a substance across a membrane with no energy investment

Question 4

7.4

Answer 4

Active transport uses energy to move solutes against their gradients

Question 5

7.5

Answer 5

Bulk transport across the plasma membrane occurs by exocytosis and endocytosis

Question 6

What are six major functions that are performed by proteins of the plasma membrane?

Answer 6

Transport, Enzymatic activity, Signal transduction, cell to cell recognition, Inter-cellular joining, and attachment to the cytoskeleton and extra- cellular matrix.