Life at the Cellular 3 Flashcards Preview

Science for Medicine > Life at the Cellular 3 > Flashcards

Flashcards in Life at the Cellular 3 Deck (14):
1

Name 4 types of energy.

Heat, light, mechanical, electrical.

2

Can energy change from one from to another?

Yes.

3

What are the 2 laws that govern energy changes?

1. Energy can be converted from one from to another but the total energy of the universe remains constant.

2. All energy transformations ultimately lead to more disorder in the universe i.e increase the entropy.

4

What can free energy change be used to define?

The spontaneity of a reaction (-delta G)

5

If a reaction can give up energy, it is an example of a ________ reaction.

Spontaneous

6

Define reaction coupling?

One set of reactions breaks down to make a negative delta G and one set of reactions binds together to make a positive delta G.

7

Do reactions in the body often reach equilibrium?

No, as when one thing is made up, it is almost immediately used up.

8

Define dynamic steady state.

Levels never changing but reactions are always occurring.

9

Define metabolism.

The chemical processes in a living organism by which food is used for tissue growth.

10

Why are molecules such as glucose broken down bit by bit instead of in one go?

So energy can be stored.

11

What does ATP hydrolysis release free energy for?

Unfavourable reactions such as positive delta G.

12

Define exergonic catabolic pathway.

Saves free energy by forming ATP.

13

Define endergonic anabolic pathway.

Supplied with free energy through the conversion of ATP to ADP and Pi.

14

Define an electron motive force.

Redox reactions transferring electrons from one substance to another. Flow is responsible for producing the energy required by cells.