Reference no: EM131706404
1. Each of the following is a substrate for glycolysis except
A) galactose.
B) mannose.
C) lactose.
D) fructose.
E) All are substrates for glycolysis
2. Three of the ten glycolysis enzyme reactions are not simply reversed in gluconeogenesis and require different enzymes because
A) these three glycolytic enzymes cannot catalyze the reaction in the reverse direction under any circumstances.
B) these three glycolytic steps are the most highly exergonic and thermodynamically difficult to reverse.
C) NAD+ needs to be generated from NADH at each of these three steps.
D) all three steps require hydrolysis of ATP for gluconeogenesis.
E) these three glycolytic enzymes are not present in the cells performing gluconeogenesis
3. Which of the following citric acid cycle enzymes catalyzes substrate-level phosphorylation?
A) isocitrate dehydrogenase
B) α-ketoglutarate dehydrogenase
C) succinyl CoA synthetase
D) succinate dehydrogenase
E) malate dehydrogenase
4. High NADH concentration regulates pyruvate oxidative decarboxylation and the citric acid cycle by allosterically inhibiting interacting with each of the following enzymes except
A) pyruvate dehydrogenase.
B) isocitrate dehydrogenase.
C) α-ketoglutarate dehydrogenase.
D) malate dehydrogenase.
E) succinate dehydrogenase
5. Each of the following citric acid cycle enzymes is subject to allosteric regulation except
A) isocitrate dehydrogenase.
B) α-ketoglutarate dehydrogenase.
C) malate dehydrogenase.
D) fumaratehydratase.
E) pyruvate dehydrogenase
6. Each of the following molecules is an electron carrier in the electron transport system except
A) flavoproteins.
B) iron-containing cytochromes.
C) iron-sulfur proteins.
D) coenzyme Q.
E) All of the above are electron carriers.
7. When a photon is absorbed by a pigment (light-absorbing molecule), such as chlorophyll, the energy of the photon is transferred to
A) D1 protein to activate PSII.
B) ATP synthase to make ATP.
C) an electron to move it from a low to a high energy orbital.
D) Plastocyanin to be passed on to PSI.
E) NADP+ to make NADPH.
8. Which molecule in the Calvin cycle is used to synthesize starch and sucrose?
A) 3-phosphoglycerate
B) glyceraldehyde-3-phosphate
C) ribulose-1,5-bisphosphate
D) 1,3-bisphosphoglycerate
E) ribulose-5-phosphate