California State University, Northridge BIO 101 Chapter 5 1)When we talk about diffusion being "passive", what do we mean?   The hydrophilic regions of a membrane protein are most likely to be found:   The                         portion of the cell membrane is responsible for the isolating function of the membrane, while the              portion regulates exchange and communication with the environment

California State University, Northridge

BIO 101

Chapter 5

1)When we talk about diffusion being "passive", what do we mean?

2. The hydrophilic regions of a membrane protein are most likely to be found:

3. The                         portion of the cell membrane is responsible for the isolating function of the membrane, while the              portion regulates exchange and communication with the environment.

4. According to the fluid mosaic model of cell membranes, the membrane consists of      

5. Which of the following is one energy-requiring mode of transport that brings substances into a cell?

6. When a net amount of water enters cells by osmosis, we say the solution is:

7. Osmosis is a process by which water moves from a:

8. The main lipids found in cell membranes are:

9. Do these forms of transport require energy or not? Pinocytosis –

Phagocytosis –

Receptor mediated endocytosis –, Active transport –,

Exocytosis –, Osmosis – ,

Aquaporin channel activity –, Simple diffusion –,

Facilitated diffusion –

10. How does adrenaline begin to activate a muscle cell?
11. What are ways a concentration gradient could be established across a cell membrane? (check all that apply)
12. Which of these are principles of diffusion? (check all that apply)
13. What happens to a red blood cell if it is placed in each of these different conditions?

Red blood cells placed in hypertonic solution –,

Red blood cells placed in isotonic solution – , Red blood cells placed in hypotonic solution –

14. Do these make a cell membrane more fluid, or less fluid?

Introducing phospholipids with more "kinks" in the tails of the phospholipids –

Increasing the degree of saturation (hydrogenation) of fatty acids in the phospholipid –

Raising the temperature –

Introducing phospholipids with more double bonds in the tails of the phospholipids –

Increasing the ambient pressure (for example traveling to the bottom of the ocean) –

15. Molecules in the lipid bilayer that allow for transport and cell recognition are:
16. The molecules that form a barrier to the movement of large polar materials across biological membranes are:

17. Match each cell junction with its function

Allow cell-cell communication, by building a portal between the cytoplasms of adjacent cells –

Adhere cells firmly to one another, for example in cells of the skin –