Reference no: EM132653958
1. Review the figures for the structures of glycogen and cellulose. Do not memorize the figures. What do the two structures have in common? Enzymes in our bodies can digest glycogen but not cellulose. What is the difference between glycogen and cellulose that leads to this difference in digestability?
2. Explain why the sodium-potassium pump and the proton pump are considered to be electrogenic.
3. Consider the proton-sucrose symporter in the cell membrane of a plant cell (last slide). What is the source of energy for the movement of protons? What is the source of energy for the movement of sucrose?
4. A cell has a potential of -70 mV (negative inside). Therefore, negatively charged ions such as Cl- will exit the cell through channels via passive transport. Is this statement correct? Explain your answer.
5. A fungal cell has a potential of -180 mV (negative inside). There is more Ca2+ outside the cell than inside the cell. What can we conclude about the movement of Ca2+ in this case?
a. Ca2+ will enter the cell through open channels via passive transport.
b. Ca2+ will exit the cell through open channels via passive transport.
c. Ca2+ will enter the cell only through active transport.
d. Ca2+ will exit the cell passively through a carrier protein.
e. We need more information.