TEST 2 Relevant Questions from the fall BIOL 1000 TEST 2.
Also see Text:
Chapter 4 Multiple Choice 1-10
Chapter 5 Multiple Choice all but 2 and 10
Chapter 6 Multiple Choice all but 8
Chapter 7 Multiple Choice 1,2,4,5
Chapter 9 Multiple Choice 1, 3, 4, 5, 6, 7, 10
1. Which description below applies to the protein labeled “Z” in the diagram?
A) Hydrophilic transmembrane protein
B) Hydrophilic integral protein
C) Amphipathic peripheral protein
D) Amphipathic integral protein
E) Hydrophobic transmembrane protein
2. Caribou living in the Canadian Arctic are exposed to very low environmental temperatures
during the winter months. Where in the Caribou body would you expect to find cells with the
highest unsaturated fatty acid content in their membrane?
D) Rump (butt)
3. A scientist is growing yeast in solution f0r three days at room temperature. On day three the
solution is placed in a refridgerator at 10 C. What do you expect will happen?
A) The levels of desaturase enzymes will increase in these cells.
B) The levels of desaturase enzymes will remain the same in these cells.
C) The levels of saturated lipids will increase in these cells.
D) The levels of unsaturated lipids will decrease in these cells.
4. The “fluid mosaic model” applies to all membranes. What does the “mosaic” portion of the
statement refer to? A) The multiple and constant movements of phospholipids
B) The identical composition of the two monolayers
C) The slow movement of proteins relative to phospholipids
D) The many different lipids and proteins composing the membrane
5. A membrane protein permits the movement of an ion into the cell along its concentration
gradient. The energy from this movement is used to transport glucose out of the cell. This is
an example of:
B) Simple Diffusion.
D) Primary Active Transport.
6. Determine the type of reaction and ∆G demonstrated in the above diagram. Would you
expect the products to store more or less energy than the reactants in this situation?
A) Exergonic; ∆G is negative; more energy stored in products
B) Endergonic; ∆G is positive; more energy stored in products
C) Exergonic; ∆G is positive; more energy store in products
D) Endergonic; ∆G is negative; less energy stored in products
E) Exergonic; ∆G is negative; less energy stored in products
7. A chemical reaction with a negative ∆G fails to move forward (start). Why may this occur?
A) The system is stable and thus not spontaneous.
B) A high concentration of the required enzyme is present.
C) The activation energy has not been met.
D) The system is endergonic and requires the addition of ATP.
8. A metabolic pathway has the following series of coupled reactions. ABC
Reaction #A has a ΔG = -35kcal/mol
Reaction #B has a ΔG = +50kcal/mol
Reaction #C has a ΔG = -6kcal/mol Identify each reaction as either endergonic or exergonic AND determine whether enough
free energy is present for the anabolic reaction to occur.
A) endergonic, exergonic, endergonic, no anabolic reac