Metabolism Flashcards

1
Q

Define thermodynamics

A

Deals with the transformation of energy in all forms.

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2
Q

What is energy

A

Energy is the ability to do work

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3
Q

What forms does energy exist in

A

Heat (wasted) mechanical, chemical (main focus) and radiant

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4
Q

First law of thermodynamics

A

Energy is not created or destroyed it is rearranged (photosynthesis)
Or
The total amount of energy in any closed system is constant. Energy can’t be created or destroyed it can only be converted from one form to another. If a physical system gains an amount of energy another physical system must experience a loss of energy of the same amount

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5
Q

What is the primary source of energy in living systems?

A

Chemical energy

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6
Q

Conversion of energy depends on…

A

The breaking and forming of chemical bonds in a chemical reaction

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7
Q

Define bond energy

A

Measure of stability of a covalent bond between atoms and is measured in KJ. The amount of energy required to break one mole of bonds between two atoms and is also equal to the amount of energy released when that bond is formed

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8
Q

Energy absorbed vs released

A

Energy is absorbed when reactant bonds break
Energy is released when product bonds form

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9
Q

Define activation energy

A

The amount of energy required to break the reactant bonds

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10
Q

Activation energy is…

A

Equal to the difference between potential energy level of the transition state and the potential energy of the reactants

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11
Q

Define transition state

A

Temporary condition which bonds within reactants are breaking and bonds between products are forming (reached if activation energy is provided)

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12
Q

Define exothermic

A

If a chemical reaction releases more heat than it uses

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13
Q

Define endothermic

A

If more heat enters the system in a chemical reaction than is actually released at the end in of the reaction

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14
Q

The overall change in energy that occurs in a chemical reaction is called….

A

Heat or enthalpy of a reaction and is symbolized by delta H

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15
Q

Values of delta H

A

If it’s positive the reaction is endothermic
If it’s negative the reaction is exothermic

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16
Q

How to calculate enthalpy

A

Calculate bond energies for all bonds using chart of values (reactants are positive, products are negative)
Find the sum of reactants + (-products) answer depends on delta H value

17
Q

What is the second law of thermodynamics?

A

In every energy transfer or conversion some of the useful energy in the system becomes unstable and increases the entropy of the universe

18
Q

What is entropy? (Delta S)

A

Degree of disorder or randomness (during any transformations, energy tends to become increasingly unavailable for useful work (cleaning room makes entropy decrease in room and increase in the body)

19
Q

Values of entropy

A

+ means increased disorder
- means decreased disorder

20
Q

Kelvin scale

A

Based on the kinetic energy of molecules
Since it’s an absolute scale it doesn’t have degrees
At 0 kinetic energy 0 K is -273•C

21
Q

Define spontaneous change

A

Spontaneous change or reaction is one that will continue to occur on its own once it’s underway until completion with out the continual input of energy (once you burn a piece of paper it keeps burning but it also doesn’t start to burn on its own)

22
Q

Define free energy

A

Energy that can do useful work (also called Gibbs free energy)
Organisms use this to power their cells
Quantity of free energy available in a system is symbolized by the letter G

23
Q

Values of free energy

A

+ G means more free energy in products than reactants so reaction is spontaneous (they must have obtained the energy from an external source)
- G means more free energy in reaction than products, so reaction isn’t spontaneous (energy released can be used to do work in other reactions)

24
Q

What is a coupling reaction?

A

The transfer of energy from one reaction to another in order to drive the second reaction

25
Q

What does atp stand for

A

Adenosine triphosphate

26
Q

What does ATP do?

A

Directly supplied the energy that powers nearly every cellular function (transport of ions, contraction of muscles, moving of chromosomes in cell division, driving endergonic reactions and beating of cilla)

27
Q

Hydrolysis of ATP into ADP

A

ATP + H2O —> Pi + ADP + energy

28
Q

What is photosynthesis

A

The process by which the energy of sunlight (photon) is converted into the energy of glucose