2.4 enzymes Flashcards Preview

biology module 2- foundations in biology > 2.4 enzymes > Flashcards

Flashcards in 2.4 enzymes Deck (25)
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1

what is an enzyme?

a biological catalyst

2

what is an enzyme made from?

proteins

3

how do enzymes speed up reactions?

they lower the activation energy required for a reaction

4

lipase digests - into

lipids, fatty acids and glycerol

5

amylase digests - into

starch, maltose

6

protease digests - into

proteins, amino acids

7

all enzymes are - proteins

globular

8

enzymes are all

catalysts

9

enzymes all have

specific active sites

10

enzyme activity is affected by

temperature and pH

11

enzymes regulate metabolic reactions at a

cellular level

12

enzymes can influence the - and - of the whole organism

structure, function

13

intracellular enzymes catalyse reactions

within cells

14

extracellular enzymes catalyse reactions

outside of cells

15

catalase is an - found in - (liver cells)

intracellular, hepatocytes

16

catalase detoxifies - into water and -

hydrogen peroxide, oxygen

17

activation energy is

the energy required to break the original bonds so that a reaction can proceed

18

what is the current accepted hypothesis

induced fit hypothesis

19

what is the theory of the induced fit hypothesis

the enzyme changes it's active site slightly to achieve a better fit

20

describe Brownian Motion

molecules in solution move randomly and continuously

21

heat increases the

kinetic energy and ROR

22

increased kinetic energy leads to...

- more frequent collisions
- more successful collisions

23

when it's too hot, which bonds in enzymes break first

H bonds and ionic bonds

24

when it's too hot, which structure of the protein breaks

tertiary

25

when it's too hot, the active site loses

its 3D conformational shape