Cell Transport Recap Answer Keyby The Amoeba Sisters Answer Key PDF

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KEY AMOEBA SISTERS: VIDEO RECAP

CELL TRANSPORT

KEY: Amoeba Sisters Video Recap: Cell Transport The cell membrane is important for maintaining homeostasis, because it controls what enters and leaves a cell.

2. What is simple diffusion?

Simple diffusion involves passive movement of ____________________________________________________ molecules from high to low concentration, often ____________________________________________________ via a semi-permeable membrane. ____________________________________________________

1. Sketch the phospholipid bilayer of a cell membrane below and label the polar heads and nonpolar tails.

Polar heads

____________________________________________________ 3. Circle the statements below that would be TRUE about simple diffusion. HINT: There is more than one! A) B) C) D)

It is a form of passive transport. Molecules travel with the concentration gradient. It is how glucose travels across the cell membrane. It is how oxygen and carbon dioxide travel across the membrane. E) This transport is typical for large molecules.

Nonpolar tails

Moving with the Concentration Gradient 4. “Moving with the flow” (i.e. going with the concentration gradient) is the direction of flow in passive transport. Show this in the diagram on right by drawing in 10 total circles (to represent molecules). You must decide a certain amount to place on the left vs. the right side after viewing the arrow indicating the direction of movement. Label the high concentration side and low concentration side.

Note: Illustrations may vary, but student should have an arrow going from high concentration (more molecules) to low concentration (less molecules).

High Concentration

Low Concentration

Endocytosis and Exocytosis Active Transport 5. Are endocytosis and exocytosis forms of passive or active transport? ____________________________ __________________ An amoeba trying to take in food particles 6. Give a scenario where a cell may need to perform a form of endocytosis. _________________________________________ __ would need to do endocytosis, specifically a type of endocytosis called phagocytosis. (Answers may vary _________________________________________________________________________________________________________ although this is example in the video). _________________________________________________________________________________________________________ A plant cell building cell wall components __ 7. Give a scenario where a cell may need to perform a form of exocytosis. __________________________________________ may need to do exocytosis to bring building materials (such as cellulose) out of the plant cell. _________________________________________________________________________________________________________ (Answers may vary although this is example in the video). _________________________________________________________________________________________________________

KEY AMOEBA SISTERS: VIDEO RECAP

CELL TRANSPORT

Traveling Molecules For the following scenarios, determine whether the molecules in the scenario are moving by (S) simple diffusion, (F) facilitated diffusion, or (A) active transport. 8. _____ F For water to travel across the cell membrane at a substantial rate, the water molecules travel through protein channels known as aquaporins.

S While water molecules are polar, they are also very small. One fact not mentioned in the video is that some water 9. _____ molecules are able to squeeze directly through the phospholipid bilayer due to their small size. F Charged ions are traveling through a cell membrane with the concentration gradient. 10. ____ A 11. ____Cells lining the gut need to take in glucose, but at a certain time, the concentration of extracellular glucose is lower than the concentration already stored in the cells. F a certain time, glucose is in a high concentration outside of a cell and needs to travel through the membrane into the 12. ___At cell.

Facilitated Diffusion via a Protein Channel

Active Transport via a Protein Channel

For the below image, label the 13. polar area and 14. nonpolar area on the diagram.

For the below image, label the 17. polar area, and 18. nonpolar area.

Draw in 15. protein channel and 16. molecules that would represent a potential concentration gradient in facilitated diffusion via a protein channel on the diagram.

Draw in 19. protein channel and 20. molecules that would represent a potential concentration gradient in active transport via a protein channel on the diagram.

Note: Drawings will vary, but student should understand direction of movement of high to low concentration. #16 (molecules drawn)

Note: Drawings will vary, but student should understand direction of movement of low to high concentration. #17 (polar area)

#13 (polar area) ATP energy required! #19 (protein channel)

#15 (protein channel)

#14 (nonpolar area)

#18 (nonpolar area)

#20 (molecules drawn)...