Practice Test Chapter 9, Schemes and Mind Maps of Cell Biology

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Practice Test Chapter 9

Name___________________________________

1)The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction

A)loses electrons and loses energy. B)gains electrons and gains energy. C)gains electrons and loses energy. D)neither gains nor loses electrons, but gains or loses energy. E)loses electrons and gains energy.

2)When a molecule of NAD+(nicotinamide adenine dinucleotide) gains a hydrogen atom (not a hydrogen ion) the molecule becomes

A)reduced. B)a reducing agent. C)oxidized. D)hydrogenated. E)redoxed.

3)Where does glycolysis takes place? 3) A)mitochondrial intermembrane space B)cytosol C)mitochondrial matrix D)mitochondrial inner membrane E)mitochondrial outer membrane

4)Which process in eukaryotic cells will proceed normally whether oxygen (O 2 ) is present or absent? 4) A)the citric acid cycle B)oxidative phosphorylation C)chemiosmosis D)glycolysis E)electron transport

5)In addition to ATP, what are the end products of glycolysis? 5) A)CO 2 and H 2 O B)H 2 O, FADH 2 , and citrate C)CO 2 and NADH D)CO 2 and pyruvate E)NADH and pyruvate

6)In glycolysis, for each molecule of glucose oxidized to pyruvate 6) A)2 molecules of ATP are used and 2 molecules of ATP are produced. B)2 molecules of ATP are used and 4 molecules of ATP are produced. C)2 molecules of ATP are used and 6 molecules of ATP are produced. D)6 molecules of ATP are used and 6 molecules of ATP are produced. E)4 molecules of ATP are used and 2 molecules of ATP are produced.

7)Which of the following molecules enters the citric acid cycle and is formed, in part, by the removal of a carbon (CO 2 ) from one molecule of pyruvate?

A)glyceraldehydes- 3 - phosphate B)oxaloacetate C)acetyl CoA D)citrate E)lactate

8)During aerobic respiration, electrons travel downhill in which sequence? 8) A)food  citric acid cycle  ATP  NAD+ B)food  glycolysis  citric acid cycle  NADH  ATP C)glucose  ATP  electron transport chain  NADH D)food  NADH  electron transport chain  oxygen E)glucose  pyruvate  ATP  oxygen

9)Cellular respiration harvests the most chemical energy from which of the following? 9) A)generating carbon dioxide and oxygen in the electron transport chain B)chemiosmosis C)transferring electrons from organic molecules to pyruvate D)substrate-level phosphorylation E)converting oxygen to ATP

10)In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP+Pito ATP?

A)energy released from movement of protons through ATP synthase B)energy released as electrons flow through the electron transport system C)No external source of energy is required because the reaction is exergonic. D)energy released from substrate-level phosphorylation E)energy released from ATP synthase pumping hydrogen ions from the mitochondrial matrix

11)Which of the following occurs in the cytosol of a eukaryotic cell? 11) A)oxidation of pyruvate to acetyl CoA B)glycolysis and fermentation C)oxidative phosphorylation D)fermentation and chemiosmosis E)citric acid cycle

12)Phosphofructokinase is an allosteric enzyme that catalyzes the conversion of fructose- 6 - phosphate to fructose-1,6-bisphosphate, an early step of glycolysis. In the presence of oxygen, an increase in the amount ATP in a cell would be expected to

A)activate the enzyme and increase the rates of glycolysis and the citric acid cycle. B)activate the enzyme and thus slow the rates of glycolysis and the citric acid cycle. C)inhibit the enzyme and thus increase the rate of glycolysis and the concentration of citrate. D)inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle. E)inhibit the enzyme and thus increase the rates of glycolysis and the citric acid cycle.