1. In the complex reactions that make up cellular respiration,energy is transferred by
A. phosphorylation reactions
B. redox reactions Â
C. neither 1 or 2
D. both 1 and 2
2. Respiration of carbohydrate substrates provides more energythan proteins substrates because
A. proteins have no C-H bonds
B. proteins cannot be processed by glycolysis
C. proteins compete with NADH reduction reactions
D. proteins release NH3
3. Which of the 4 stages of respiration is anaerobic, and cancontinue without oxygen?
A. citric acid cycle
B. glycolysis
C. electron transport and oxidative phosphorylation
D. pyruvate processing
4. ATP is a regulatory molecule for the allosteric enzymephospho-fructose kinase. This regulatory mechanism of the activityof glycolysis is called:
A. interference inhibition
B. competitive inhibition
C. feedback inhibition
D. active site inhibition
5. The NET output of glycolysis of 1 glucose molecule is
A. 4 ATP, 2 NADH
B. 2ATP, 2 FADH2
C. 2 ATP, 2 NADH
D. 2 ATP, 2 FADH2
6. Which of the four stages of respiration does NOT take placein mitochondria
A. pyruvate processing
B. glycolysis
C. Citric acid cycle
D. electron transport and oxidative phosphorylation
7. The citric acid cycle is a set of sequential reactions where2 carbon atoms from Acetyl CoA (that derives from a glucosemolecule) are coupled to a 4 carbon molecule. The carbon atoms fromAcetyl CoA are released as CO2. Redox reactions and phosphorylationreactions are used to harvest energy in the form of ATP, NADH andFADH2. The product of these reactions is again a 4 carbon moleculethat can be coupled with 2 carbon atoms from another Acetyl CoA torepeat the whole process
A. true, this is a correct description of the citric acidcycle
B. false, the citric acid cycle starts with pyruvate assubstrate
C. false, the citric acid cycle employs only redox reactions
D. false, the citric acid cycle does not yield NADH
8. The net total output of energy rich molecules fromrespiration of a molecule of glucose after the citric acid cycleis
A. 2 ATP, 50 NADH, 4 FADH2
B. 2 ATP, 10 NADH, 2 FADH2
C. 4 ATP, 10 NADH, 2 FADH2
D. 4 ATP, 2 NADH, 10 FADH2
9. In the absence of oxygen, cellular respiration switches tofermentation. Fermentation is a set of alternative reactions tocomplete glycolysis and produce 2 ATP for a glucose molecule, bymaking sure that the following reagent is available
A. NAD (oxidized electron carrier)
B. EtOH (alcohol)
C. NADH (reduced electron carrier)
D. Acetyl CoA (substrate for citric acid cycle)
