Cell membrane structure and functions diagram.
Diagram of the cell membrane showing the lipid bilayer, protein channels, and carbohydrate chains, with arrows indicating the movement of molecules.
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Step-by-step solution for: Biology Cell Worksheets | Biology worksheet, Cell biology, Cells ...
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Show Answer Key & Explanations
Step-by-step solution for: Biology Cell Worksheets | Biology worksheet, Cell biology, Cells ...
Here are the answers to your homework questions on Cell Boundaries.
1. Name two functions of the cell membrane:
It protects the cell and controls what enters and leaves the cell.
2. The cell membrane contains \_\_\_\_\_\_\_\_\_\_ molecules that are embedded in the lipid bilayer.
protein
3. Why do scientists call the membrane a “mosaic”?
Because it is made of many different parts (like proteins and carbohydrates) scattered throughout the lipid bilayer, looking like tiles in a mosaic artwork.
4. On the image, label the:
*(Note: Since I cannot draw on your paper, here is where you should point)*
* a. lipid bilayer: Point to the double layer of circles with tails (the main background structure).
* b. protein channel: Point to the large shapes spanning across the membrane that look like tunnels or gates.
* c. carbohydrate chains: Point to the branching chains sticking out from the top surface of the membrane.
5. What three types of organisms have cell walls?
Plants, fungi, and bacteria.
6. What is the main function of the cell wall?
To provide support and protection for the cell.
7. What are plant cell walls composed of?
Cellulose
8. One of the most important functions of the cell membrane is to \_\_\_\_\_\_\_\_\_\_ the movement of dissolved \_\_\_\_\_\_\_\_\_\_ from the liquid on one side of the membrane to the liquid on the other.
regulate (or control); substances (or solutes)
9. A solution is a \_\_\_\_\_\_\_\_\_\_ of two or more substances.
mixture
10. Define diffusion:
The movement of particles from an area of high concentration to an area of low concentration until they are evenly spread out.
11. When the particles are the same throughout, the system has reached \_\_\_\_\_\_\_\_\_\_.
equilibrium
12. Diffusion depends on \_\_\_\_\_\_\_\_\_\_ particle movements, therefore it [ does | does not ] (circle) require energy.
random; does not
OSMOSIS
13. If a substance is able to diffuse across a membrane, the membrane is said to be \_\_\_\_\_\_\_\_\_\_.
permeable
14. Define osmosis:
The diffusion of water through a selectively permeable membrane.
15. Isotonic means \_\_\_\_\_\_\_\_\_\_.
having the same concentration of solutes inside and outside the cell.
Hypertonic means \_\_\_\_\_\_\_\_\_\_.
having a higher concentration of solutes outside the cell than inside.
Hypotonic means \_\_\_\_\_\_\_\_\_\_.
having a lower concentration of solutes outside the cell than inside.
16. Because cells are hypertonic in relation to fresh water, \_\_\_\_\_\_\_\_\_\_ produces a net movement of water into the cell. If that happens, the cell will become \_\_\_\_\_\_\_\_\_\_ and can even burst.
osmosis; swollen (or turgid)
17. In plant and bacteria cells, what keeps them from bursting due to osmotic pressure?
The cell wall
FACILITATED DIFFUSION
18. Cell membranes have \_\_\_\_\_\_\_\_\_\_ that make it easy for certain molecules to cross the membrane.
transport proteins (or protein channels)
19. When proteins help molecules move across the membrane, it is called \_\_\_\_\_\_\_\_\_\_.
facilitated diffusion
1. Name two functions of the cell membrane:
It protects the cell and controls what enters and leaves the cell.
2. The cell membrane contains \_\_\_\_\_\_\_\_\_\_ molecules that are embedded in the lipid bilayer.
protein
3. Why do scientists call the membrane a “mosaic”?
Because it is made of many different parts (like proteins and carbohydrates) scattered throughout the lipid bilayer, looking like tiles in a mosaic artwork.
4. On the image, label the:
*(Note: Since I cannot draw on your paper, here is where you should point)*
* a. lipid bilayer: Point to the double layer of circles with tails (the main background structure).
* b. protein channel: Point to the large shapes spanning across the membrane that look like tunnels or gates.
* c. carbohydrate chains: Point to the branching chains sticking out from the top surface of the membrane.
5. What three types of organisms have cell walls?
Plants, fungi, and bacteria.
6. What is the main function of the cell wall?
To provide support and protection for the cell.
7. What are plant cell walls composed of?
Cellulose
8. One of the most important functions of the cell membrane is to \_\_\_\_\_\_\_\_\_\_ the movement of dissolved \_\_\_\_\_\_\_\_\_\_ from the liquid on one side of the membrane to the liquid on the other.
regulate (or control); substances (or solutes)
9. A solution is a \_\_\_\_\_\_\_\_\_\_ of two or more substances.
mixture
10. Define diffusion:
The movement of particles from an area of high concentration to an area of low concentration until they are evenly spread out.
11. When the particles are the same throughout, the system has reached \_\_\_\_\_\_\_\_\_\_.
equilibrium
12. Diffusion depends on \_\_\_\_\_\_\_\_\_\_ particle movements, therefore it [ does | does not ] (circle) require energy.
random; does not
OSMOSIS
13. If a substance is able to diffuse across a membrane, the membrane is said to be \_\_\_\_\_\_\_\_\_\_.
permeable
14. Define osmosis:
The diffusion of water through a selectively permeable membrane.
15. Isotonic means \_\_\_\_\_\_\_\_\_\_.
having the same concentration of solutes inside and outside the cell.
Hypertonic means \_\_\_\_\_\_\_\_\_\_.
having a higher concentration of solutes outside the cell than inside.
Hypotonic means \_\_\_\_\_\_\_\_\_\_.
having a lower concentration of solutes outside the cell than inside.
16. Because cells are hypertonic in relation to fresh water, \_\_\_\_\_\_\_\_\_\_ produces a net movement of water into the cell. If that happens, the cell will become \_\_\_\_\_\_\_\_\_\_ and can even burst.
osmosis; swollen (or turgid)
17. In plant and bacteria cells, what keeps them from bursting due to osmotic pressure?
The cell wall
FACILITATED DIFFUSION
18. Cell membranes have \_\_\_\_\_\_\_\_\_\_ that make it easy for certain molecules to cross the membrane.
transport proteins (or protein channels)
19. When proteins help molecules move across the membrane, it is called \_\_\_\_\_\_\_\_\_\_.
facilitated diffusion
Parent Tip: Review the logic above to help your child master the concept of biology worksheet.
