Bioenergetics Flashcards

1
Q

A reaction with a large positive change in free energy is

A

Extremely unfavorable

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2
Q

An unfavorable reaction has an equilibrium constant between

A

Zero and 1

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3
Q

An endothermic reaction has a

A

Positive change in enthalpy, or +∆H

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4
Q

How is the change in free energy for exergonic reactions?

A

Negative, -∆G

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5
Q

A negative change in free energy (-∆G) represents a

A

Spontaneous reaction

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6
Q

Spontaneous reactions have equilibrium constants that are

A

Greater than 1

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7
Q

ATP hydrolysis refers to the reaction that

A

Cleaves the phosphoanhydride bond that results in a phosphate molecule and ADP as products

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8
Q

ATP hydrolysis involves the hydrolysis of the

A

Phosphoanhydride bond linking the gamma phosphate to the beta phosphate

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9
Q

A spontaneous reaction always

A

Decreases free energy ∆G of the system

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10
Q

The standard reduction potential is a measure of the

A

Tendency of a chemical species to be reduced

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11
Q

How many Pi are in ADP?

A

2

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12
Q

How many Pi are in ATP?

A

1

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13
Q

The free energy stored by ADP is

A

Positive and greater that the free energy stored by AMP

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14
Q

One would expect ATP hydrolysis to be non-spontaneous when

A

ATP concentration is very far below equilibrium concentration and ADP concentration is very far above equilibrium concentration

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15
Q

Spontaneous reactions have products that have a

A

Lower energy compared to reactants

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16
Q

Cellular respiration is a redox reaction involving

A

Glucose and Oxygen

17
Q

The products of cellular respiration are

A
  • Water
  • CO2
  • Heat
18
Q

Glucose is oxidized to what molecule during aerobic cellular respiration?

19
Q

Oxygen is reduced to what molecule during aerobic cellular respiration?

20
Q

What is the ultimate source of electrons for aerobic cellular respiration?

21
Q

What is the final electron acceptor in aerobic cellular respiration?

22
Q

Aerobic cellular respiration results in the transfer of electrons from

A

Glucose to Oxygen

23
Q

ΔG represents the difference of

A

Free energy between products and reactants

24
Q

A negative ΔG means that the

A

Products have less energy than reactants

25
∆G is unaffected by
Catalysts
26
Cellular respiration reactants have
High energy
27
What kind of reaction is cellular respiration?
Exergonic
28
Endergonic reactions have a
+∆G
29
Exergonic reactions have a
-∆G
30
If an antibiotic works properly, it will
Reduce enzymatic activities in bacteria
31
What happens to the activation energy of certain bacteria's chemical reactions if an antibiotic works properly?
The energy increases
32
A competitive inhibitor has an affinity for
Enzyme active sites
33
The absence of Oxygen in the ETC would reduce the
Overall free energy released
34
What kind of reaction is the ETC overall?
Exergonic
35
Muscle contraction depends on
Energy release for ATP breakdown
36
ATP breakdown occurs via
Hydrolysis