Intro to Metabolism and Energy Flashcards Preview

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Flashcards in Intro to Metabolism and Energy Deck (21)
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1

Define metabolism

all of a cells chemical reactions

2

Reactions that require energy to organize the cell are ________. An example would be __________.

1. anabolic
2. DNA replication

3

What is catabolism, give an example

Reactions that release energy from breakdown of nutrients (cellular respiration)

4

What energy is used to drive anabolic reactions

Energy from catabolic reactions

5

What are the two laws of thermodynamics?

1. Energy can not be created nor destroyed, only converted/transformed
2. Entropy (randomness/disorder) of the universe is always increasing (disorder up=stability up)

6

Spontaneous reactions are _______ (endergonic/exergonic), which means energy is ________ (released/required) and Gibbs free energy is _________ (negative/positive).

1. exergonic
2. released
3. negative

7

What is ATP

-Adenosine triphosphate
-RNA nucleotide
-major source of energy in cells
-energy currency

8

What is Pi

inorganic phosphate (PO4)

9

Formula of ATP hydrolysis

ATP=ADP+Pi

10

Where is energy stored

Phosphate bonds

11

When the third phosphate is removed from ATP to form ADP, energy is _______.

released (exergonic)

12

Why does ATP store energy

the third phosphate

13

Do enzymes change Gibbs free energy?

no, they only lower the activation energy

14

What do enzymes end in?

-ase

15

What binds to enzymes active sites

Substrates

16

What is induced fit in catalysis

When an enzyme changes its shape slightly to accommodate a substrate

17

Can enzymes be reused

yes

18

How do enzymes lower activation energy of a reaction

Bring reactants close together, active site has favorable environment for rxns, physically stress bonds to be broken, covalently bind to a substrate, place substrate in correct orientation

19

Two types of enzyme inhibitors

Competitive and non-competitive (musical chairs)

20

Define a competitive enzyme inhibitor

Binds to active site but does not participate in the reaction, can be outcompeted by high amounts of substrate

21

Define non-competitive enzyme inhibitors

Binds a site on the enzyme that is not the active site, blocks enzyme activity, changes shape of active site (breaks chair)