Enzymes. ch3

Question 1

what is an enzyme

Answer 1

Enzymes are globular proteins(3-D structures, spherical,water soluble) that act as a catalyst

Question 2

what is activation energy

Answer 2

it is the energy required for a reaction to take place

Question 3

why are enzymes so important?

Answer 3

All the reactions that takes place in a cell cannot happen without the assistance of enzymes

Question 4

what do enzymes do to activation energy

Answer 4

they reduce the activation energy for a new reaction to occur

Question 5

enzymes usually end in

Answer 5

‘-ase’

Question 6

How do enzymes work?

Answer 6

They have an active site that is able to bind to a substrate which is complementary to the shape of the active site

Question 7

describe the lock and key model

Answer 7

an enzymes active site is higly specific and is complementary to its substrate. Because they are complementary, they come together to form an enzyme-substrate complex (it is temporary). It then reduces the activation energy and the substrate is then converted to its product

Question 8

what makes the lock and key model different from the induced fit model

Answer 8

if the substrate is not complementary to the enzymes active site, the enzyme-substrtae complex will not form

Question 9

describe the induced fit model

Answer 9

a substrate does not necessarily fit inside the active site of the enzyme, so the active site changes slightly to fit the substrate to form an E-S complex. After the products are formed, the enzyme returns to its normal shape

Question 10

give the similarities between the lock and key model and the induced fit model

Answer 10

1. both form E-S complex
2. both lowers the activation energy