BIOLOGY 111 EXAM 2 TEST QUESTIONS & ANSWERS
What element would diffuse most easily through a cell's plasma membrane? - Answer -
N2
What DOES NOT utilize any active transport? - Answer -Water moving through a
phospholipid bilayer by osmosis
Which molecule in the structure of plasma membrane prevents the membrane from
becoming too fluid? - Answer -Cholesterol
Generally, if the reactants in a chemical reaction have a lower free energy level than the
products then △G is ___ and the reaction is ___ - Answer -> 0 ; endergonic
Enzymes speed up chemical reactions by ___ - Answer -Lowering activation energy
(Ea)
What is NOT true about enzyme regulation? - Answer -Allosteric inhibition of an
enzyme can be overcome by adding more substrate
What are photoautotrophs? - Answer -Land plants, algae, cyanobacteria, and purple
sulphur bacteria
A newly discovered plant has a unique photosynthetic pigment. The leaves of this plant
are reddish-yellow in color due to the pigment. Based on the color of the leaf pigment,
what wavelengths of visible light are being maximally absorbed by the pigment? -
Answer -Blue and violet
What produces the oxygen that plants release during photosynthesis? - Answer -
Oxidation of H2O in light reactions
The electrons released from reaction centers in PS2 and PS1 in the presence of photos
are carried to the Calvin Cycle on the electron carrier molecule NADPH. These
electrons originated as part of ___ molecules and will ultimately become part of ___
molecules through the process of photosynthesis - Answer -Water; G3P/Glucose
Assume a thylakoid membrane is somehow punctured or ruptured so that the thylakoid
space is no longer separated from the storm. This damage will have the most direct
effect on which process? - Answer -The synthesis of ATP
The Calvin Cycle of photosynthesis uses 9 ATP and 6 NADPH each time it runs. What
mechanism in the light reactions ensures that enough ATP is ultimately generated to
fulfill the ATP requirement of the Calvin Cycle? - Answer -Cyclic electron flow, electrons
flow down the electron transport chain between PS2 and PS1 more than once before
ending up on NADPH
What element would diffuse most easily through a cell's plasma membrane? - Answer -
N2
What DOES NOT utilize any active transport? - Answer -Water moving through a
phospholipid bilayer by osmosis
Which molecule in the structure of plasma membrane prevents the membrane from
becoming too fluid? - Answer -Cholesterol
Generally, if the reactants in a chemical reaction have a lower free energy level than the
products then △G is ___ and the reaction is ___ - Answer -> 0 ; endergonic
Enzymes speed up chemical reactions by ___ - Answer -Lowering activation energy
(Ea)
What is NOT true about enzyme regulation? - Answer -Allosteric inhibition of an
enzyme can be overcome by adding more substrate
What are photoautotrophs? - Answer -Land plants, algae, cyanobacteria, and purple
sulphur bacteria
A newly discovered plant has a unique photosynthetic pigment. The leaves of this plant
are reddish-yellow in color due to the pigment. Based on the color of the leaf pigment,
what wavelengths of visible light are being maximally absorbed by the pigment? -
Answer -Blue and violet
What produces the oxygen that plants release during photosynthesis? - Answer -
Oxidation of H2O in light reactions
The electrons released from reaction centers in PS2 and PS1 in the presence of photos
are carried to the Calvin Cycle on the electron carrier molecule NADPH. These
electrons originated as part of ___ molecules and will ultimately become part of ___
molecules through the process of photosynthesis - Answer -Water; G3P/Glucose
Assume a thylakoid membrane is somehow punctured or ruptured so that the thylakoid
space is no longer separated from the storm. This damage will have the most direct
effect on which process? - Answer -The synthesis of ATP
The Calvin Cycle of photosynthesis uses 9 ATP and 6 NADPH each time it runs. What
mechanism in the light reactions ensures that enough ATP is ultimately generated to
fulfill the ATP requirement of the Calvin Cycle? - Answer -Cyclic electron flow, electrons
flow down the electron transport chain between PS2 and PS1 more than once before
ending up on NADPH
