Question

4. Predict which of the following organisms would have the shortest phospholipids in their plasma membranes: A. Desert snake B. Humans C. Antarctic fish D. Bacteria living in an active volcano 5. Transport through a symport transporter requires which of the following steps? A. lons must be phosphorylated to move against their concentration gradient B. High concentrations of $K^+$ ions must be found outside of the cell C. An ion must travel down its electrochemical gradient D. ATP hydrolysis must phosphorylate the symport transporter E. Equal concentrations of $Na^+$ must be on the inside and outside of the cell 6. The picture below shows a vesicle that contains a transmembrane protein in its membrane. The N-terminus and C-terminus of the protein are indicated. If this vesicle moves from the Golgi to the plasma membrane, where will the N- terminus of the protein be located after vesicle fusion? A. The N-terminus will interact with the extracellular environment B. The N-terminus will remain in the lumen of the vesicle C. The N-terminus will interact with the cytosol of the cell D. The N-terminus will be cleaved off the protein Image modified from vesicle image in public domain. Finally, we're going to practice understanding action potentials. You will always be given a reminder of the relative concentrations of different ions inside versus outside of a cell. Use this information to help yourself remember which directions different ions will move during nerve signaling and to remember which steps require active vs passive transport. Cell Membrane Extracellular Intracellular $Na^+$ $Cl^-$ $K^+$ Ion Concentration Gradients

4. Predict which of the following organisms would have the shortest phospholipids
in their plasma membranes:
A. Desert snake
B. Humans
C. Antarctic fish
D. Bacteria living in an active volcano
5. Transport through a symport transporter requires which of the following steps?
A. lons must be phosphorylated to move against their concentration gradient
B. High concentrations of $K^+$ ions must be found outside of the cell
C. An ion must travel down its electrochemical gradient
D. ATP hydrolysis must phosphorylate the symport transporter
E. Equal concentrations of $Na^+$ must be on the inside and outside of the cell
6. The picture below shows a vesicle that contains a transmembrane protein in its
membrane. The N-terminus and C-terminus of the protein are indicated. If this
vesicle moves from the Golgi to the plasma membrane, where will the N-
terminus of the protein be located after vesicle fusion?
A. The N-terminus will interact with the extracellular
environment
B. The N-terminus will remain in the lumen of the vesicle
C. The N-terminus will interact with the cytosol of the cell
D. The N-terminus will be cleaved off the protein
Image modified from vesicle image in public domain.
Finally, we're going to practice understanding action potentials. You will always be given
a reminder of the relative concentrations of different ions inside versus outside of a cell.
Use this information to help yourself remember which directions different ions will move
during nerve signaling and to remember which steps require active vs passive transport.
Cell Membrane
Extracellular
Intracellular
$Na^+$
$Cl^-$
$K^+$
Ion Concentration Gradients

Added by Thomas A.

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