Energy and Metabolism Flashcards Preview

Bio 2 (Let's go Chagnon) > Energy and Metabolism > Flashcards

Flashcards in Energy and Metabolism Deck (30):
1

What is the 1st law of thermodynamics?

Energy is transformed, not created or destroyed.

2

Energy is converted into what?

Metabolism

3

What is oxidation?

Loss of electrons

4

What is reduction?

Gain of electrons

5

How can we move energy?

By redox reactions

6

A+B----> A(+) + B(-)

A is being oxidized (loses e-)
A is being reduced (accepts e-)

7

A reaction requiring an input of energy

Endergonic (+delta G)

8

A reaction that releases free energy

Exergonic (-delta G)

9

A minimum amount of energy is required to initiate a reaction.

Activation energy (Ea)

10

What occurs at Ea?

Destabilization of existing chemical bonds

11

What is required even for spontaneeous (exergonic) reaction?

Ea

12

What are metabolic pathways?

Series of chemical reactions occurring in sequence within a cell

13

What can the pathways look like?

Linear
Forked
Cyclical

14

Give 2 advantages of Metabolic pathways.

Small steps more manageable requires less energy)
Use one resource for several pathways (conserve matter and energy)

15

What does an anabolic chemical reaction require to initiate progress in a reaction?

Input of cellular energy (ATP)

16

What retains energy in the bonds between phosphates?

ATP

17

When the bond between P-P is broken, energy is released. The product is then _____

ADP (adenosine diphosphate) + Pi (inorganic phosphate)

18

The terminal phosphate group leaves ATP and bonds to a substrate energizing it thus causing a shape change.

Phosphorylation

19

The substrate accepting the phosphate is said to be______

phosphorylated

20

When the phosphate group leaves the substrate, the shape changes again, and in so doing, work is done.

Dephosphorylation

21

It demonstrates the effect of the shape change.

The motor protein of myosin in muscle cells

22

How does ATP do work?

By causing molecules to undergo a shape change

23

ATP is made in the presence of what?

ADP and a phosphorylated substrate

24

ATP is made during what?

rearrangement of a substrate

25

Making ATP steps

-Substrate level phosphorylation
-Chemiosmosis

26

Biochemical reaction often occur in ___.

harmony

27

A reaction that releases energy (catabolic - usually exothermic) will be

“coupled” or associated with a reaction that requires energy (anabolic – usually endothermic)

28

Energy released from an catabolic (or exothermic) reaction can drive what?

ATP formation too

29

The ATP generated by energy coupling is used to drive what?

Anabolic reaction

30

Can ATP store energy?

NOOOOOOO, too unstable