Life120 Biology Practice Exam 2
Terms in this set (20)
What is the term for metabolic pathways that release stored energy by breaking down complex molecules?
The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction
Loses electrons and loses potential energy.
Whenever energy is transformed, there is always an increase in the
Entropy of the universe
The mechanism in which the end product of ametabolic pathway inhibits an earlier step in the pathway is most precisely described as
Which of the following statements describes NAD+?
NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
Which of the following statements describes NADH?
NADH is oxidized to NAD+ at the electron transport chain and in the fermentation.
Where does glycolysis take place in eukaryotic cells?
The ATP made during glycolysis is generated by
Why are carbohydrates and fats considered high energy foods?
They have a lot of electrons associated with hydrogen.
The primary role of oxygen in cellular respiration is to
Act as an acceptor for electrons and hydrogen, forming water.
Inside an active mitochondrion, most electrons follow which pathway?
Citric acid cycle → NADH → electron transport chain → oxygen
Energy released by the electron transport chain is used to pump H+ into which location in eukaryotic cells?
Mitochondrial intermembrane space
Which of the following occurs in the cytosol of a eukaryotic cell?
Glycolysis and fermentation
In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP?
Energy released from movement of protons through ATP synthase
Which of the following sequences correctly represents the flow of electrons during
If photosynthesizing green algae are provided with CO2 synthesized with heavy oxygen (18O), later analysis will show that all but one of the following compounds produced by the algae contain the 18O label. That one is
Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?
ATP and NADPH
In the thylakoid membranes, what is the main role of the antenna pigment molecules?
Harvest photons and transfer light energy to the reaction-center chlorophyll
When oxygen is released as a result of photosynthesis, it is a direct by -product of
Splitting water molecules.
P680+ is said to be the strongest biological oxidizing agent. Why?
This molecule has a stronger attraction for electrons than oxygen, to obtain electrons from water.