Question

cell transport video handout
this handout accompanies the cell transport video by the amoeba sisters on youtube. complete the before the show section first. then, try to guess the answers to the showtime questions before starting the video.
full url: https://www.youtube.com/watch?v=ptmlvtei8hw&t=3s
tiny url: https://tinyurl.com/2p9avpkx
before the show (answer before you start video)
a. why is it important that you are able to take things into your home and also take things out of your home?
b. what do you think might happen if cells could not bring things into the cell or release materials out of the cell?
showtime questions (answer while viewing the video)

1. which organelle helps maintain homeostasis by controlling what goes into and out of the cell?

a. cell wall
b. nucleus
c. cell membrane

1. what is the phospholipid bilayer made up of?

a. two layers of phospholipids made up of polar heads and nonpolar tails
b. two layers of phospholipids made up of nonpolar heads and polar tails
c. one layer of phospholipids made up of polar heads and nonpolar tails

1. small nonpolar molecules, such as oxygen and carbon dioxide, move directly through the cell membrane in a process called...

a. active transport
b. simple diffusion
c. facilitated diffusion

1. what does it mean when something is \going with the concentration gradient\?

a. molecules move more from a low to high concentration
b. molecules move from a high to low concentration
c. molecules leave the cell and go to the concentration gradient

1. which of the following is not true of facilitated diffusion?

a. molecules move with the concentration gradient
b. it is a type of passive transport
c. it moves molecules through protein channels
d. it requires cell energy

1. what is the name of the transport protein used in osmosis?

a. aquaporin
b. osmotic protein
c. membrane protein

1. why does the membrane use active transport?

a. to transport molecules against the concentration gradient
b. to transport large or charged molecules
c. both a and b

1. what type of energy do cells use to perform active transport?

a. mechanical energy
b. atp energy
c. thermal energy

1. how do large molecules move in endocytosis?

a. from outside the cell to inside the cell
b. from inside the cell to outside the cell
c. through the sodium - potassium pump

1. which of the following is not true?

a. cells take in liquids in pinocytosis and solids in phagocytosis
b. endocytosis is a type of active transport
c. receptor - mediated endocytosis is not particular about the substances being brought into the cell

1. exocytosis is used to release cell waste and materials the cell has made.

a. true
b. false

Explanation:

1. The cell - membrane controls what enters and exits the cell to maintain homeostasis.
2. The phospholipid bilayer consists of two layers of phospholipids with polar heads and non - polar tails.
3. Small non - polar molecules like oxygen and carbon dioxide move through the cell membrane by simple diffusion.
4. "Going with the concentration gradient" means molecules move from high to low concentration.
5. Facilitated diffusion is a passive transport where molecules move with the concentration gradient through protein channels and does not require cell energy.
6. Aquaporins are the transport proteins used in osmosis.
7. The membrane uses active transport to move molecules against the concentration gradient and to transport large or charged molecules.
8. Cells use ATP energy for active transport.
9. In endocytosis, large molecules move from outside the cell to inside the cell.
10. Receptor - mediated endocytosis is specific about the substances being brought into the cell.
11. Exocytosis is used to release cell waste and materials the cell has made.

Answer:

1. c. cell membrane
2. a. two layers of phospholipids made up of polar heads and nonpolar tails
3. b. simple diffusion
4. b. molecules move from a high to low concentration
5. d. it requires cell energy
6. a. aquaporin
7. c. both A and B
8. b. ATP energy
9. a. from outside the cell to inside the cell
10. c. receptor - mediated endocytosis is not particular about the substances being brought into the cell
11. a. true