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AP bio unit III

Terms in this set (129)

Which of the following are nitrogenous bases of the purine type?
guanine and adenine
The amino acids of the protein keratin are arranged predominantly in an α helix. This secondary structure is stabilized by
hydrogen bonds
For the hydrolysis of ATP to ADP + Pi, the free energy change is -7.3 kcal/mol under standard lab conditions (1 M concentration of both reactants and products). In the cellular environment, however, the free energy change is about -13 kcal/mol. What can we conclude about the free energy change for the dehydration reaction (the opposite reaction) of ATP from ADP and Pi under cellular conditions?
...
Which of the following is a statement of the first law of thermodynamics?
Energy cannot be created or destroyed.
Substrate-level phosphorylation accounts for approximately what percentage of the ATP formed by the reactions of glycolysis?
100%
Which of the following statements describes NAD+?
NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
The transport of pyruvate into mitochondria depends on the action of a trans-membrane protein that uses energy to move materials across the membrane. What method of transport moves pyruvate into the mitochondrion?
active transport
During the Krebs cycle (Citric Acid cycle) of cellular respiration, acetyl CoA accumulates in which location?
mitochondrial inner matrix (space)
Why is glycolysis described as having an investment phase and a payoff phase?
It uses stored ATP and then forms a net increase in ATP.
What is the name of the sugar molecule present in ATP
ribose
The reactions that produce molecular oxygen (O2) take place in
the light reactions alone
According to the figure above, how would you classify Photosystem I and II?
Integral transmembrane proteins
What is the primary function of the Calvin cycle?
synthesize simple sugars from carbon dioxide
Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be
to test for the release of O2 during light reactions.
What most likely causes the trends in oxygen concentration shown in the graph above?
Photosynthesis produces more oxygen than is consumed by respiration during the day.
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