CH 9 - Metabolic Pathways

Question 1

____________ is the most common fuel in cells

Answer 1

Question 2

Answer 2

Question 3

Answer 3

Question 4

Answer 4

Question 5

Answer 5

Question 6

How many CATABOLIC processes harvest the energy from glucose?

Answer 6

Three:

Gylcolysis(aerobic or anaerobic)
Cellular respiration (aerobic)
Fermentation (anaerobic)

Question 7

Answer 7

Question 8

Answer 8

Question 9

Answer 9

Question 10

Answer 10

Question 11

Answer 11

Question 12

True or false: Red Blood Cells utilize glycolysis, aerobic respiration, and fermentation for energy

Answer 12

False: Red Blood Cells lack mitochondria and can only perform glycolysis

Question 13

Answer 13

Question 14

Answer 14

Question 15

Answer 15

Question 16

Which of the following structures shows ATP? What are the different components?

Answer 16

Question 17

For a reaction with energy of products > energy of reactions it would be considered _________________(Exergonic/Endergonic)

Answer 17

Endergonic
Anabolic
+G
Requires energy

Question 18

The final product of a reaction is blocked from being released by which type of inhibitor?

Answer 18

Uncompetitive inhibitor

Question 19

How do exergonic reactions differ from endergonic reactions?

Answer 19

Exergonic = -G, catabolic, products have lower energy (more stable) than reactants, energy released can be used by the system to do work, can be used to drive anabolic reactions

Endergonic = +G, anabolic, products have more energy (less stable) than reactants, require input of energy

Question 20

What is the NET number of ATP/NADH/Pyruvate produced by substrate level phosphorylation during glycolysis?

Answer 20

2 ATP
2 NADH
2 Pyruvate

Question 21

Which enzyme splits the hexose (1,6-FBP) into DHAP and G3P?

Answer 21

Adolase

Question 22

Which type of enzyme adds a phosphate group?

Answer 22

Kinase
Ex: Hexokinase (Glucose to G6P)

Question 23

Which type of enzyme changes the structure of DHAP and G3P?

Answer 23

Isomerase

Question 24

Which product of fermentation has 2 Carbons? 3 Carbons?

Answer 24

2 C = Ethanol
3 C = Lactic Acid

Question 25

The thylakoid membrane and stroma are analogous to the _____________ and ____________ in the mitochondria?

Answer 25

Intermembrane space = thylakoid membrane (High H+)

Matrix = stroma (low H+)

Question 26

Which type of enzyme takes hydrogen (e-) from G3P and transfers to NAD+?

Answer 26

Triose phosphate dehydrogenase

Question 27

Which enzyme converts Phosphoenolpyruvate to pyruvate during the final step of glycolysis?

Answer 27

Pyruvate kinase

Question 28

How many molecules of CO2, NADH, FADH, ATP are produced PER (1) molecule of pyruvate during the Kreb’s cycle?

Answer 28

2 CO2 (+1 from glycolysis)=3 total
3 NADH (+1 from glycolysis) = 4 total
1 FADH
1 ATP

Question 29

Which type of enzyme is utilized in the electron transport chain for oxidative phosphorylation?

Answer 29

Reductase

Question 30

What is the final electron acceptor in oxidative phosphorylation?

Answer 30

O2 -> H2O

Question 31

Which subunit of the ATP synthase faces the intermembrane space? Mitochondrial matrix?

Answer 31

F0 (lollipop) = intermembrane space
F1 = matrix

Question 32

What is the electron acceptor in fermentation?

Answer 32

Pyruvate

Question 33

How many CO2 are produced during fermentation?

Answer 33

2 CO2

Question 34

Which type of enzyme adds a H+ to lactate anion- to form lactic acid?

Answer 34

Lactate dehydrogenase adds H to NAD+ to form NADH and lactic acid

Question 35

Which molecule has the lowest free energy?

Answer 35

H2O if compared to molecules with CnH2n

Question 36

How would you reduce the likelihood that a competitive inhibitor will bind to the active site?

Answer 36

Increase the concentration of substrate

Question 37

What molecule donates the electrons in photosynthesis?

Answer 37

H2O