.
A-Level Biology
Question and Answers 2020/2021
All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020
,Table of Contents
Topics that only contain interactive questions ............................................................................................................................................ 3
Biological Molecules and Enzymes (Questions) ........................................................................................................................................... 4
Biological Molecules and Enzymes (Answers) ............................................................................................................................................. 6
Cells and Organelles (Questions) .................................................................................................................................................................. 8
Cells and Organelles (Answers) .................................................................................................................................................................. 10
Classification (Questions) ............................................................................................................................................................................. 13
Classification (Answers) ............................................................................................................................................................................... 14
DNA and the Genetic Code (Questions) ..................................................................................................................................................... 16
DNA and the Genetic Code (Answers) ....................................................................................................................................................... 18
Ecological Concepts (Questions) ................................................................................................................................................................. 21
Ecological Concepts (Answers).................................................................................................................................................................... 24
Evolution (Questions) ................................................................................................................................................................................... 26
Evolution (Answers) ...................................................................................................................................................................................... 28
Gas Exchange (Questions) * ....................................................................................................................................................................... 32
Gas Exchange (Answers) ............................................................................................................................................................................. 35
Genetic Engineering (Questions) ................................................................................................................................................................ 37
Genetic Engineering (Answers) ................................................................................................................................................................... 38
Homeostasis (Questions) * .......................................................................................................................................................................... 40
Homeostasis (Answers) ................................................................................................................................................................................ 42
Immunity (Questions) .................................................................................................................................................................................. 44
Immunity (Answers) ..................................................................................................................................................................................... 45
Movement and Support in Animals (Questions)........................................................................................................................................ 47
Movement and Support in Animals (Answers) .......................................................................................................................................... 49
Nervous and Hormonal Control (Questions) .............................................................................................................................................. 51
Nervous and Hormonal Control (Answers) ................................................................................................................................................ 53
Nutrition and Digestion (Questions) * ........................................................................................................................................................ 55
Nutrition and Digestion (Answers) .............................................................................................................................................................. 57
Photosynthesis (Questions) ......................................................................................................................................................................... 59
Photosynthesis (Answers) ............................................................................................................................................................................ 61
Reproduction (Questions) * ......................................................................................................................................................................... 63
Respiration (Questions) * ............................................................................................................................................................................ 69
Respiration (Answers) .................................................................................................................................................................................. 71
Transport (Questions) .................................................................................................................................................................................. 73
Transport (Answers) ..................................................................................................................................................................................... 77
* = topics that contain interactive resources, multiple choice questions or audio files. To interact with this content, please go
to www.s-cool.co.uk/biology.
These questions cover the main areas of this subject. Please check the specific areas you need with your exam board. They are
provided “as is” and S-cool do not guaranteed the suitability, accuracy or completeness of this content and S-cool will not be
liable for any losses you may incur as a result of your use or non-use of this content. By using these notes, you are accepting
the standard terms and conditions of S-cool, as stated in the s-cool website (www.s-cool.co.uk).
All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020
,Topics that only contain interactive questions
These topics only contain interactive questions such as animations, multiple choice or audio files. To
interact with this content, please go to www.s-cool.co.uk/biology.
Applications of Genetic Engineering
Genetics
Health & Disease
Making use of the genetic code
All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020
, Biological Molecules and Enzymes (Questions)
1. a) The diagram shows the formula of a molecule of an organic compound.
(i) To which group of organic compounds does this molecule belong?
(1 mark)
(ii) Give one way in which this molecule differs from other compounds in the group.
(1 mark)
b) The table shows some of the organic compounds found in a bacterial cell.
Compound Percentage of total dry mass Number of different types of molecule
Protein 55 1050
RNA 20.5 463
DNA 3.1 1
Lipid 9.1 4
Glycogen 2.5 1
(i) Glycogen and protein are both polymers. Explain why there can only be one type of glycogen molecule, but
there can be many types of protein.
(2 mark)
(ii) Explain why there are many types of RNA found in this cell.
(2 mark)
(Marks available: 6)
All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020
A-Level Biology
Question and Answers 2020/2021
All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020
,Table of Contents
Topics that only contain interactive questions ............................................................................................................................................ 3
Biological Molecules and Enzymes (Questions) ........................................................................................................................................... 4
Biological Molecules and Enzymes (Answers) ............................................................................................................................................. 6
Cells and Organelles (Questions) .................................................................................................................................................................. 8
Cells and Organelles (Answers) .................................................................................................................................................................. 10
Classification (Questions) ............................................................................................................................................................................. 13
Classification (Answers) ............................................................................................................................................................................... 14
DNA and the Genetic Code (Questions) ..................................................................................................................................................... 16
DNA and the Genetic Code (Answers) ....................................................................................................................................................... 18
Ecological Concepts (Questions) ................................................................................................................................................................. 21
Ecological Concepts (Answers).................................................................................................................................................................... 24
Evolution (Questions) ................................................................................................................................................................................... 26
Evolution (Answers) ...................................................................................................................................................................................... 28
Gas Exchange (Questions) * ....................................................................................................................................................................... 32
Gas Exchange (Answers) ............................................................................................................................................................................. 35
Genetic Engineering (Questions) ................................................................................................................................................................ 37
Genetic Engineering (Answers) ................................................................................................................................................................... 38
Homeostasis (Questions) * .......................................................................................................................................................................... 40
Homeostasis (Answers) ................................................................................................................................................................................ 42
Immunity (Questions) .................................................................................................................................................................................. 44
Immunity (Answers) ..................................................................................................................................................................................... 45
Movement and Support in Animals (Questions)........................................................................................................................................ 47
Movement and Support in Animals (Answers) .......................................................................................................................................... 49
Nervous and Hormonal Control (Questions) .............................................................................................................................................. 51
Nervous and Hormonal Control (Answers) ................................................................................................................................................ 53
Nutrition and Digestion (Questions) * ........................................................................................................................................................ 55
Nutrition and Digestion (Answers) .............................................................................................................................................................. 57
Photosynthesis (Questions) ......................................................................................................................................................................... 59
Photosynthesis (Answers) ............................................................................................................................................................................ 61
Reproduction (Questions) * ......................................................................................................................................................................... 63
Respiration (Questions) * ............................................................................................................................................................................ 69
Respiration (Answers) .................................................................................................................................................................................. 71
Transport (Questions) .................................................................................................................................................................................. 73
Transport (Answers) ..................................................................................................................................................................................... 77
* = topics that contain interactive resources, multiple choice questions or audio files. To interact with this content, please go
to www.s-cool.co.uk/biology.
These questions cover the main areas of this subject. Please check the specific areas you need with your exam board. They are
provided “as is” and S-cool do not guaranteed the suitability, accuracy or completeness of this content and S-cool will not be
liable for any losses you may incur as a result of your use or non-use of this content. By using these notes, you are accepting
the standard terms and conditions of S-cool, as stated in the s-cool website (www.s-cool.co.uk).
All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020
,Topics that only contain interactive questions
These topics only contain interactive questions such as animations, multiple choice or audio files. To
interact with this content, please go to www.s-cool.co.uk/biology.
Applications of Genetic Engineering
Genetics
Health & Disease
Making use of the genetic code
All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020
, Biological Molecules and Enzymes (Questions)
1. a) The diagram shows the formula of a molecule of an organic compound.
(i) To which group of organic compounds does this molecule belong?
(1 mark)
(ii) Give one way in which this molecule differs from other compounds in the group.
(1 mark)
b) The table shows some of the organic compounds found in a bacterial cell.
Compound Percentage of total dry mass Number of different types of molecule
Protein 55 1050
RNA 20.5 463
DNA 3.1 1
Lipid 9.1 4
Glycogen 2.5 1
(i) Glycogen and protein are both polymers. Explain why there can only be one type of glycogen molecule, but
there can be many types of protein.
(2 mark)
(ii) Explain why there are many types of RNA found in this cell.
(2 mark)
(Marks available: 6)
All copyright and publishing rights are owned by S-cool. First created in 2000 and updated in 2013, 2015 & 2020
