Part 3: Cellular Energetics Flashcards

0
Q

Enzymes

A

Biological catalysts; enable cells to break chemical bonds without using (much) energy; speed up reaction without changing it by lowering the reaction’s activation energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

Bioenergetics

A

The study of how cells carry out the processes necessary for life, and the way in which cells release energy when they need it and store it when they don’t; how energy from the sun is transformed into energy in living things

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Exergonic reactions

A

Products have less energy than reactions, energy is given off during reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Endergonic reactions

A

Reactions that require an input of energy; products have more energy than reactants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Activation energy

A

Energy required to start a reaction and break the chemical bonds of the reactants; energy barrier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Enzyme specificity

A

Property of enzymes that they can only catalyze one type of reaction; each enzyme can only bind to one specific substrate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Substrate

A

Targeted molecules in an enzymatic reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Active site

A

Place on the enzyme that a substrate binds to

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Enzyme-substrate complex

A

Molecule formed by the binding of a substrate onto an enzyme

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Induced fit

A

Enzyme slightly changes shape to accommodate substrate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Coenzymes

A

Organic factors that aid an enzyme in catalyzing a reaction; accept electrons and pass them on to another substrate; ex. Vitamins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Cofactors

A

Inorganic molecules that help catalyze reactions; usually metal ions (Fe+2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Allosteric sites

A

Sites other than the active site that other substances can bind to

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Allosteric regulators

A

The “other substances” that can bind to the allosteric site to inhibit or activate enzymes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Allosteric inhibitor

A

Allosteric regulator that inactivates the enzyme

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Allosteric activator

A

Allosteric regulator that induces an enzymes function

16
Q

Feedback inhibition

A

Formation of an end product inhibits an earlier reaction in the sequence

17
Q

Competitive inhibition

A

A substance that has the shape that fits the active site of an enzyme blocks the substrate from binding to the active site and inactivates enzyme

18
Q

Noncompetitive inhibition

A

Inhibitor binds with enzyme at a place other than the active site and inactivates enzyme by changing its shape

19
Q

First law of thermodynamics

A

Energy cannot be created or destroyed

20
Q

Second law of thermodynamics

A

Energy transfer leads to less organization; universe tends toward chaos (entropy)

21
Q

Entropy

A

Chaos, disorder

22
Q

Photosynthesis

A

Transformation of solar energy into chemical energy

6CO2 + 6H2O + sunlight –> C6H12O6 + 6O2

23
Q

Cellular respiration

A

C6H12O6 + 6O2 –> 6CO2 + 6H2O + ATP
Way to synthesize ATP
Aerobic or anaerobic

24
Aerobic respiration
Cell resp. in the presence of O2
25
Anaerobic respiration
Cell resp. not in the presence O2
26
Glycolysis
Splitting of glucose; stage one of cell resp.; occurs in cytoplasm, net 2 ATP, products: 2 pyruvate (3C molecules) and 2 NADH
27
Pyruvic acid (pyruvate)
3-Carbon molecules, formed from glucose in glycolysis | 4 fates: acetyl CoA (aerobic), lactic acid (anaerobic), glucose (glyconeogenesis), or
28
Parts of the mitochondria
Matrix- innermost area Inner mit. Memb. Intermemb. Space Outer mit. Memb.
29
Acetyl CoA
2C molecule formed from pyruvate during transition reaction
30
Krebs cycle (citric acid cycle)
acetyl CoA combines with oxaloacetate (4C) to form citric acid (6C) and continues thru cycle Products: 1 ATP, 3 NADH, 1FADH2, 2CO2 per pyruvate (x2 to get per glucose)
31
Cytochromes
Iron-containing carrier molecules in the electron transport chain
32
pH gradient (proton gradient)
Created by pumping H ions into the intermemb. space, energy from gradient responsible for the production of ATP
33
ATP synthase
Channels on the inner mit. memb. that H+ ions pass through to generate ATP
34
Oxidative phosphorylation
``` The process by which ATP is synthesized as a result of the flow of protons through the ATP synthase in the mitochondria 34 ATP (NADH makes 3, FADH makes 2) ```
35
Fermentation
Anaerobic resp.- pyruvate converted to either lactic acid (animals) or ethanol (plants)