01 Cell biology
The origin of cells 1.5
Life has evolved from the first cells to all the cells we find in the huge diversity of today's organisms. This topic covers the origins of cells and the cell theory proposed by Pasteur and Schwaan in an age when spontaneous generation of cells was s…
01 Cell biology
Ultrastructure of cells 1.2
Eukaryote cells are larger than prokaryote cells and they have a more compartmentalised structure since endosymbiosis led to the creation of organelles. There are two basic types to draw, eukaryote and prokaryote cells. In this topic it's important…
01 Cell biology
Introduction to cells 1.1
…differentiation in multicellular organisms. Differentiation involves the expression of some genes and not others in a cell. Stem cells can divide and differentiate along different pathways in embryonic development which makes stem cells useful for t…
Revision quizzes for DP Biology 2025
A2.1 Origin of cells - revision quiz
…early Earth atmosphere and the way lipids form 'bubbles' which can enclose other molecules and become cells. A2.1 Origin of cells quiz20/10/2023: Twenty revision questions for this topic…
Paper 2 style Exam questions
Paper 2 questions Topic 1 Cells
…ty to check your knowledge of the essential terminology. Great for revision. Paper 2 style question about topic 1.1 Intro to cells: Use the buttons to review the topic, try a question and check your answer. Paper 2 style question on topic 1.2 Ultrast…
11 Animal physiology AHL
Antibody production & vaccination 11.1 HL
…leading to antibody production. There are many details required including knowledge of B lymphocytes, T lymphocytes, memory cells and plasma cells. Vaccination as a method of promoting antibody production leading to immunity is an important concept…
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01 Cell biology
Cell division 1.6
…or the reproduction of single celled organisms. This topic covers the movement of chromosomes in the division of eukaryotic cells by mitosis. There is a section about the control of the cell cycle and how some cells can begin dividing out of control…
06 Human physiology
Defence against disease 6.3
… This topic covers the production of antibodies and the cascade of reactions in blood clotting. The functions of blood cells in the immune system as well as specific immunity and antibodies. Methods of transmission of HIV is also included. Key…
03 Genetics SL
Meiosis 3.3
Meiosis is the process which allows sexual reproduction to be possible. It produces four haploid cells which make gametes. Sometimes non-disjunction can cause problems when the movement of chromosomes doesn't happen as it is supposed to. In this…
09 Plant biology AHL
Transport in xylem 9.1 HL
…stomata. The transport of water through a plant is driven by transpiration in leaves. Water evaporates from the surfaces of cells and this water vapour fills the air spaces. Key concepts Learn and test your biological vocabulary using these 9.1 Tran…
Revision quizzes for DP Biology 2025
D2.3 Water potential - revision quiz
…f the first cells, the early Earth atmosphere and the way lipids form 'bubbles' which can enclose other molecules and become cells. D2.3 Water potential quiz01/03/2024: A quiz for this topic…
Revision quizzes for DP Biology 2025
A2.2 Cell structure - revision quiz
…tructure This topic is all about the use of microscopes, preparation of slides and the structure of prokaryote and eukaryote cells. A2_2 Cell structure revision quiz27/09/2023: Revision questions…
02 Molecular biology
Enzymes 2.5
Enzymes control almost everything which happens inside the cells of all living organisms. In this topic we consider how enzymes make reactions faster as well as the effects of different environmental factors on the rate of enzyme controlled reaction…
02 Molecular biology
Respiration 2.8
…life. This topic covers the basics of aerobic and anaerobic respiration. It is important to know what the role of ATP is in cells and also to have experience of using a respirometer to measure the rate of respiration. Key concepts Learn and test you…
01 Cell biology
…differentiation in multicellular organisms. Differentiation involves the expression of some genes and not others in a cell. Stem cells can divide and differentiate along different pathways in embryonic development, which makes stem cells useful for…
Option D Human physiology
…combustion, heating water. Use databases to calculate nutritional composition of a daily diet. D2 Digestion The structure of cells of the epithelium of the villi, including microvilli Exocrine glands secrete to the surface of the body or the lumen of…
10 Genetics AHL
Inheritance 10.2 HL
…iece of paper, then check your answer against the model answer below. Antirrhinum flower A pure-breeding red-flowered, short stem snapdragon (Antirrhinum majus) is crossed with a pure-breeding white-flowered long stem variety. The seeds are planted a…
Option A - Neurobiology
…nic chordates form a neural tube by in-folding of the ectoderm followed by elongation of the tube formed. Differentiation of cells in the neural tube produces neurons. Immature neurons migrate to their final location. Each immature neuron grows an ax…
09 Plant biology AHL
Transport in phloem 9.2 HL
…. Sucrose is transported from sources (usually leaves) to sinks where the sucrose is used. c. Phloem is made from columns of cells with perforated cell walls at each end. (seive plates) d. Active transport is used to pump sucrose into phloem. e. A hi…
06 Human physiology
…elps absorb the monomers formed by digestion and mineral ions and vitamins. Different nutrients are absorbed into epithelial cells by different membrane transport mechanisms. Guidance: The enzyme name trypsin and the method used to activate it are no…
09 Plant biology AHL
Growth in plants 9.3 HL
…th: 48px Layout: row Summary Summary list for 9.3 Growth in plants Meristems and growth Plant meristems are undifferentiated cells which allow indeterminate growth (ie: plants continue to grow when adult.) Mitosis and cell division in the shoot apex…
11 Animal physiology AHL
…ccination 11.2 Movement 11.3 The kidney and osmoregulation 11.4 Sexual reproduction 11.1 Antibody production and vaccination Cells & pathogens The surface of cells of an organism has unique molecules. Pathogens can be species-specific or can cross sp…
03 Genetics SL
Genetic Modification 3.5
…ls can be cloned at the embryo stage by breaking up the embryo into more than one group of cells. or by using differentiated cells in adults. The cloned sheep, Dolly can be used as an example of the cloning method of somatic-cell nuclear transfer. Sk…
09 Plant biology AHL
…e cohesive and adhesive properties of water molecules allow water transport under tension in xylem and cell walls. The roots cells use active transport for the uptake of mineral ions (nitrates) which causes osmosis and the absorption of water. Xeroph…
03 Genetics SL
…bnormalities. Remember studies showing age of parents influences chances of non-disjunction. Describe methods used to obtain cells for karyotype analysis e.g. chorionic villus sampling and amniocentesis and the associated risks. Draw diagrams to show…
07 Nucleic acids AHL
Transcription 7.2 HL
…ch on or switch off transcription. An example of when gene expression is switched on or off is during the differentiation of stem cells. DNA can be wrapped around histone proteins to form nucleosomes to regulate transcription. Nucleosome formation ca…
01 Cell biology
Membrane transport 1.4
…diffusion, facilitated diffusion, osmosis and active transport. The fluidity of membranes allows materials to be taken into cells by endocytosis or released by exocytosis. Vesicles move materials within cells. Know how the structure helps the functi…
Paper 2 style Exam questions
Cross topic question challenges
…Water and plants (Higher level only) Water and plants04/02/2023: Cross sub topic question (Higher level only) Evolution from cells to organisms Evolution of cells and species04/02/2023: Cross topic question on evolution. Cells, chromosomes and genes.…
06 Human physiology
Hormones and reproduction 6.6
…el in the blood more slowly than nerve impulses but are more widely distributed. Insulin and glucagon control blood glucose (cells in islets of pancreas). Thyroxin regulates metabolic rate & partly controls body temperature. (thyroid gland). Leptin a…
05 Evolution
Classification of biodiversity 5.3
…tebrate features used for classification. (4 marks) Phylum Characteristic features for Classification Porifera Colonies of cells with no symmetry. Each organism independent, collagen and mineral skeleton, flagella. a) Radial symmetry, mouth but n…
11 Animal physiology AHL
Kidney and osmoregulation 11.3 HL
…st for Kidney and osmoregulation 11.3 Control of water balances in different animals Some animals are osmoconformers - their cells have solute concentration equal to their environment (eg. marine invertebrates) Vertebrates and insects are osmoregulat…
Option B - Biotechnology
Topic 1 Cell Biology - Paper 1 questions
…from any mistakes. Every question has an examiner's explanation of the correct answer. qBank dynamic quiz Topics: Topic 1 - Cells | Introduction to cells | Ultrastructure of cells | Membrane structure | Membrane transport | The origin of cells | Cel…
Paper 1 style Exam questions
Topic 1 Cell Biology Paper 1 questions
…Every question has an examiner's explanation that appears when you check your answers. qBank dynamic quiz Topics: Topic 1 - Cells | Introduction to cells | Ultrastructure of cells | Membrane structure | Membrane transport | The origin of cells | Cel…
06 Human physiology
Blood system 6.2
…stem Arteries carry blood at high pressure from the ventricles of the heart to the tissues of the body. Arteries have muscle cells and elastic fibres in their walls.which maintain blood pressure between ventricle contractions. Capillaries carry blood…
Option B - Biotechnology
…is a proteome? If a new gene from another species in added to the genome of a GMO what difference might this lead to in the cells of the organism? What are some of the potential benefits to agriculture of GMOs? How do biologists use bioinformatics t…
06 Human physiology
Neurones and synapses 6.5
…l & action potential). Local currents cause each successive part of the axon to reach the threshold potential. Myelin sheath cells around the axons of nerve fibres allows for saltatory conduction. Synapses (only chemical synapses) join neurons and al…
02 Molecular biology
…ins, rhodopsin, collagen & spider silk. Every individual has a unique proteome. Proteomics and the production of proteins by cells cultured in fermenters offer many opportunities for the food, pharmaceutical and other industries (a utilisation) Skill…
02 Molecular biology
Molecules to metabolism 2.1
…There are two types: Anabolism and Catabolism. Outline the way that each of these reactions changes monomers and polymers in cells. [4] ....................................................................................... ........................…
Success with diagrams
…urther practice on StudyIB Here are a few options for how you could use our resources for more practise: Ultrastructure of cells 1.2 Learn and test your biological vocabulary for labels of cells using these flash cards Membrane structure 1.3 Prac…
07 Nucleic acids AHL
Translation 7.3 HL
…ctivation in the conversion of the mRNA base sequence into a polypeptide sequence. (2 marks) iii Outline two ways by which cells can increase the rate at which they synthesise polypeptides. (2 marks) Hint: In a structured question, use brief, acc…
11 Animal physiology AHL
Movement 11.2 HL
…arm. Support - giving the body the overall shape. An extra point is cell production - the manufacture of red and white blood cells in bone marrow. text Test yourself Multiple Choice questions This is a self marking quiz containing questions coverin…
06 Human physiology
Digestion & absorption 6.1
…elps absorb the monomers formed by digestion and mineral ions and vitamins. Different nutrients are absorbed into epithelial cells by different membrane transport mechanisms. Skills Apply knowledge of the process or digestion and absorption in the sm…
11 Animal physiology AHL
Sexual reproduction 11.4 HL
…usel Thumb width: 48px Layout: row text Exam style questions Sexual reproduction Understanding the structure of mature sperm cells and the placenta are both important steps in understanding their function in this topic. Many students learn the names…
02 Molecular biology
Proteins 2.4
…ins, rhodopsin, collagen & spider silk. Every individual has a unique proteome. Proteomics and the production of proteins by cells cultured in fermenters offer many opportunities for the food, pharmaceutical and other industries. Ability to draw mole…
02 Molecular biology
Structure of DNA and RNA 2.6
DNA is the long molecules which makes up the genetic material in all cells. It is made from smaller units called nucleotides and in this topic a knowledge of the structure of nucleotides of DNA and RNA is required, as is a simple understanding of the…
02 Molecular biology
Photosynthesis 2.9
…ayout: row Summary Summary list for topic 2.9 Photosynthesis Photosynthesis uses light energy to produce carbon compounds in cells. Visible light ranges from violet (400nm) the shortest wavelength to red (700nm) the longest. (Students are not expecte…
Paper 2 style Exam questions
…ly there will be pages for review and revision of all eleven topics. These are the first topics Paper 2 questions Topic 1 Cells This page contains Paper 2 style questions that need structured longer written answers. A calculator can be used for an…
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