Tophat 9

Question 1

A molecule that is phosphorylated has
A. Less energy than before and therefore less energy for cellular work
B. Decreased chemical reactivity, less likely to provide energy for cellular work
C. Been oxidized as a result of a redox rxn involving the gain of an inorganic phosphate
D. An increased chemical potential energy, is primed to do cellular work

Answer 1

D

Question 2

What pathway generates reduced electron?
A. Citric acid cycle
B. Glycolysis
C. Pyruvate oxidation
D. All of the above

Answer 2

D

Question 3

During glycolysis for each molecule of glucose oxidized to pyruvate
A. 6 moles ATP produced
B. 4 moles ATP used, 2 produced
C. 2 moles used, 4 produced
D. 2 used, 2 produced

Answer 3

C

Question 4

During aerobic respiration, electrons travel downhill in which sequence?
A. Food->citric acid cycle->ATP->NAD+
B. Glucose->pyruvate->ATP->Oxygen
C. Food->NADH->ETC->oxygen

Answer 4

C

Question 5

Why are carbs and fats considered high energy?
A. Have no nitrogen in makeup
B. Have lots of electrons associated with H
C. Have lots of oxygen atoms
D. Easily reduced

Answer 5

B

Question 6

In cellular respiration, energy for lost ATP synthesis is supplied by
A. High energy phosphate bonds in organic molecules
B. Converting oxygen to ATP
C. Generating carbon dioxide and oxygen in ETC
D. Proton gradient across membrane
E. Transferring electrons from organic molecules to pyruvate

Answer 6

D

Question 7

Drugs known as uncouplers facilitate diffusion of protons across membrane. When a drug is added, what’ll happen to ATP synthesis and oxygen consumption, if the rates of glycolysis and citric acid cycle stay the same?
A. ATP synthesis and oxygen consumption decrease
B. ATP decrease, oxygen consumption increase
C. ATP increase, oxygen decrease
D. Both increase
E. ATP increase, oxygen same

Answer 7

E

Question 8

Purpose of fermentation is

Answer 8

To regenerate NAD+ so glycolysis can continue

Question 9

Probable effect on ATP production of low cal diet
A. ATP prod decrease from reduction in availability of fuel molecules
B. ATP prod increase as stores fats are catabolized
C. ATP prod increase if most calories were provided by fats and decrease if most calories were provided by high-fiber grains
D. ATP prod remain constant as stored fats or other body molecules are oxidized

Answer 9

D

Question 10

Friend lost 7 kg of fat on a regimen of strict diet and exercise. How did fat leave her body?
A. It was released as CO2 and H2O
B. It was converted to heat and then released
C. Converted to ATP, which weighs much less than fats
D. Converted to urine and eliminated from body

Answer 10

A

Question 11

Which statement about chemiosmosis synthesis of ATP is correct?
A. Energy for prod of ATP from ADP comes directly from a gradient of electrons across the inner mitochondrial membrane
B. Oxygen participates directly in rxn that makes ATP from ADP and P
C. The chemiosmosis synthesis of ATP requires that the electron transport in inner mitochondrial membrane be coupled to proton transport across the same membrane

Answer 11

C