Cambridge & Pearson Edexcel Past Paper Questions
Browse 35,704 questions from Cambridge O-Level & A-Level and Pearson Edexcel IGCSE & IAL exams. Click any question to practice.
The table shows some features of collagen and haemoglobin. Which row is collagen?
The ring structure of sugars can also be represented as a linear structure, as shown in the diagram. Which of the sugar molecules could be represen...
What is the minimum number of carbon atoms in an amino acid?
The graph shows the results of an investigation into the effect of amylase on starch at three different temperatures. Which statements are correct ...
Substances called furanocoumarins are found in some fruits, where they act as inhibitors of the enzyme CYP3A4. This enzyme is needed to break down ...
Which observations support a link between active transport and ATP production? 1 Active transport occurs only in living cells. 2 The rate of active...
The stalk of a dandelion flower is a hollow tube. Pieces of the stalk are cut as shown and placed in sucrose solutions of different water potential...
Three of the molecules found in prokaryotes are listed below. 1 phospholipid 2 protein 3 peptidoglycan Which of these molecules are found in prokar...
Which row correctly shows the behaviour of the nuclear envelope, the centrioles and the spindle during a stage of mitosis?
Which group of cells can all divide by mitosis?
Which row represents the correct features of the nitrogenous base cytosine? key: ✓ = true, X = false
Bacteria were grown in a medium containing ¹⁵N. After several generations, all of the DNA contained ¹⁵N. Some of these bacteria were transferred to...
Which processes are involved in the mass movement of water through xylem vessels? 1 hydrogen bonding between water molecules 2 cohesion between wat...
The diagram shows a model to demonstrate mass flow. In a plant, what are the structures W, X, Y and Z and what is the direction of flow of solution...
Which blood vessels carry blood into the atria of the heart?
Which statement describes the effect of increased carbon dioxide concentration on the oxygen dissociation curve of human haemoglobin and its signif...
What combines with haemoglobin to form carbaminohaemoglobin?
The graph shows the pressure in three parts of the heart during one cycle. At 0.2 seconds, which part of the heart is responding to the excitatory ...
The diagram shows part of the organisation of the circulation of a mammal. Where are both the blood pressure and speed of flow lowest? [Figure 33.1]
A student made some labelled drawings of lung tissue using the high-power lens of a light microscope, but did not label two airways, P and Q. The d...
The photomicrograph shows part of the lung as seen using a light microscope. Which row is correct for the features labelled 1, 2 and 3? [Figure 36.1]
Which disease is not likely to be passed directly from parents to child?
Why is it difficult to control the spread of measles? 1 Global air travel for commerce and tourism has increased. 2 The virus that causes measles r...
The following are all responses made by cells of the immune system to a pathogen. 1 mitosis 2 bind to infected cell 3 produce memory cells 4 secret...
What occurs when active immunity is artificially induced?
Which equation for calculating the actual size of a specimen, A, or image size, I, or magnification, M, is correct?
One of the smallest viruses is the polio virus, which has a diameter of approximately 30 nm. In 2003, the Mimivirus was discovered which has a diam...
Which cell components are present in all prokaryotic cells? [Figure 3.1 - table showing presence/absence of cell components in prokaryotic cells]
The electron micrograph shows part of an animal cell. [Figure 4.1] What will be synthesised in large quantities in this cell? 1 ATP, 2 glucose, 3 RNA
A student carried out four tests for biological molecules on a sample of milk. The tests and their results were as follows. • Heating to 80 °C with...
Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and glucose. Whi...
The diagram shows the structure of the polysaccharide chitin which is found in the cell wall of fungi. [Figure 10.1 - molecular diagram of chitin s...
Which row correctly matches the functional and structural features of cellulose, collagen, glycogen or triglyceride? [Figure 11.1 - table matching ...
A polypeptide has a number of amino acids (n). How many peptide bonds and R groups (side chains) does this polypeptide have?
What are the features of triglycerides? [Figure 13.1 - table of triglyceride features]
Which of these statements describe the action of an extracellular enzyme? 1 synthesis of a polynucleotide in the nucleus during DNA replication, 2 ...
An experiment was carried out in which the enzyme lipase was used to hydrolyse a triglyceride. The pH was recorded at regular intervals during the ...
Which statement about the effect of substrate concentration on the activity of an enzyme is correct?
Which row shows a correct function of the components of the cell surface membrane? [Figure 17.1 - table of cell surface membrane components and fun...
The graph shows how the rate of entry of substance X into a cell changes as the concentration of substance X outside the cell increases. [Figure 18...
The photomicrographs show cells in various stages of the cell cycle. In which stage does semi-conservative replication of DNA take place? [Figure 1...
The diagram shows the structure of one chromosome. [Figure 20.1 - chromosome diagram] Which row is correct? [Figure 20.2 - table describing parts o...
Cancer cells may divide by far more divisions than other cells found in humans. Which statement about cancer cells is correct?
Which statements concerning DNA and RNA are correct? 1 Adenine and guanine are bases that have a double ring structure; cytosine, thymine and uraci...
Two sets of bacteria were grown using different types of nitrogen-containing growth media. One set was grown in a medium containing the ‘heavy’ iso...
The diagram shows the nucleotide sequence of a small section of a gene which is transcribed. GCGCGCGGCGCG The table shows the amino acids coded for...
What contributes to the movement of water through the xylem vessel elements?
The diagram shows a xerophytic leaf in different conditions, P and Q. [Figure 27.1 - diagrams of xerophytic leaves in conditions P and Q] Which sta...
What are features that adapt root hair cells for efficient uptake of mineral ions? 1 a large number of mitochondria, 2 a large number of protein ca...
The transverse sections of two plant organs are shown. [Figure 29.1 - transverse sections of two plant organs with labelled tissues] Which pair of ...