2c

Question 1

what does a catalyst do?

Answer 1

changes the rate of a chemical reaction without being used up

Question 2

what is a enzyme?

Answer 2

it is a biological catalyst- a protein that speeds up a chemical reaction

Question 3

what requires enzymes?

Answer 3

1- respiration
2- protein synthesis
3- photosynthesis

Question 4

what does the replication of DNA require?

Answer 4

it requires DNA polymerases

Question 5

what would happen if DNA polymerases weren’t present

Answer 5

it would take a long time for the bases to attach and a new DNA chain to form

Question 6

state 4 factors that affect enzyme function

Answer 6

-temperature
-ph
-substrate concentration
-enzyme concentration

Question 7

describe the effect of temp on the rate of an enzyme reaction

Answer 7

as the temperature increases so does the rate of reaction, until it exceeds optimum temperature the enzyme denatures and the rate of reaction decreases

Question 8

why does the rate of enzyme reaction increase when the temp increases?

Answer 8

the particles have more kinetic energy increasing the chance of collisions between molecules

Question 9

if temp increases above optimum temp, how does this affect enzyme function?

Answer 9

the active site will be distorted as the enzyme denatures and so it will no longer fit in the substrate

Question 10

describe the affect of ph on the rate of an enzyme controlled reaction

Answer 10

the rate of enzyme catalysed reaction is fastest at the optimum ph, if the ph is too high or low the enzyme will work less efficiently