Hard Past Questions

Question 1

What is metabolism

Answer 1

Sum of all chemical reactions in a cell

Question 2

Name one catabolic and anabolic reaction

Answer 2

Anabolic - DNA replication

Catabolic - digestion

Question 3

What is an enzyme

Answer 3

Biological catalyst

Question 4

Advantages of using immobilised enzymes

Answer 4

Allow continuous flow

Can be resused

Question 5

Name two substances in the school laboratory that can immobilise enzymes

Answer 5

Sodium Alginate

Calcium chloride

Question 6

Name a mineral required by plants and why

Answer 6

Magnesium

To capture energy in the chlorophyll for photosynthesis

Question 7

What does benedicts solution show

Answer 7

Reducing sugar

Question 8

Why is water needed by organisms

Answer 8

Turgor pressure
Solvent
Hydration

Question 9

What is the substrate of the celery enzyme experiment

Answer 9

Hydrogen peroxid

Question 10

What does NAD stand for

Answer 10

Nicotinamide adenine dinucleotide

Question 11

What is carried by NAD

Answer 11

Protons and electrons

Question 12

Name
A) metabolic and
B) structural
Role of protein

Answer 12

A) enzymes, hormones

B) hair nails skin

Question 13

Name the products formed in the celery enzyme experiment

Answer 13

Oxygen and water

Question 14

Name trace elements in the human diet

Answer 14

Iron
Copper
Zinc

Question 15

Name an anabolic reaction in plants

Answer 15

Photosynthesis

Question 16

What does immobilised mean

Answer 16

Attached or fixed to an inert substance or each other

Question 17

What are the end products of the transport electron chain

Answer 17

Oxygen and protons

Question 18

In what molecule is energy stored in the cell

Answer 18

ATP

Question 19

Why are enzymes needed for metabolism

Answer 19

To control the rate of metabolic reactions

Question 20

Two features of a denatured enzyme

Answer 20

Change in shape

Loss of function

Question 21

What is the chemical nature of enzymes

Answer 21

Protein

Question 22

What is the molecular shape of enzymes

Answer 22

Folded

Question 23

What does optimum activity mean

Answer 23

Working at fastest rate

Question 24

Write a note on ADP

Answer 24

Low Energy molecule

Adenine di phosphate

Question 25

Write a note on the kerbs cycle

Answer 25

``` Occurs in second stage of respiration It is aerobic Starts with acetyl co enzymes ATP produced CO2 produced Hydrogen pairs produced. I'm mitochondria ```

Question 26

Name 2 processes that require enzymes

Answer 26

Respiration Breaking down of food Photosynthesis

Question 27

Why are enzymes in washing powder

Answer 27

To break down food

Question 28

What is the addition of a phosphate group called

Answer 28

Phosphorylation

Question 29

Why does immobilised enzymes take longer in the experiment

Answer 29

It takes longer for the sucrose to penetrate the alginate beads

Question 30

Why do red blood cells not undergo mitosis

Answer 30

No nucleus

Question 31

Name two changes at the end of interphase

Answer 31

Spindle fibres are present | Chromatin contracts

Question 32

What does the human zygote divide by

Answer 32

Mitosis

Question 33

What does meiosis give rise to ?

Answer 33

Haploid condition

Question 34

What two processes involving DNA take place in interphase

Answer 34

Replication and transcription