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.
(a) Cats with either black fur or white fur are common in Europe, whereas cats with brown fur are less common. A gene, coding for an enzyme involv...
An investigation was carried out in a temperate woodland that contained a number of areas with two different types of ground cover vegetation. • O...
The mammalian kidney is an organ involved in homeostasis. [Figure 1.1]
Oil seed rape (canola), *Brassica napus*, has been genetically modified to be resistant to herbicides containing glufosinate ammonium. The genetica...
The red poppy, *Papaver rhoeas*, and several species of daisy of the family Compositae often co-exist as weeds of wheat fields. Fig. 5.1 shows chan...
Describe how tropomyosin and myosin are each involved in the sliding filament model of muscle contraction.
The stems of raspberry plants have spines. [Figure 7.1] shows part of a raspberry plant. [Figure 7.1] The colour of the spines is controlled by two...
A student used the internet to find information about caffeine and the possible effects it has on the body. The student decided to test the hypothe...
An investigation was carried out into the size of individuals in a species of ground beetle common in Europe. Five different sites, A to E, were sa...
Fig. 1.1 shows an aquatic crustacean belonging to the genus Daphnia. These animals usually measure between 1-5mm in length. They have a two-chamber...
Some populations of white clover, Trifolium repens, are described as cyanogenic because they produce hydrogen cyanide. Hydrogen cyanide is a poison...
An investigation was carried out into the population of a species of vole in one area of the USA. The population was sampled during the first two w...
Some features of cells are listed. 1 cell wall 2 cell surface membrane 3 ribosomes Which features can be found in plant cells and in prokaryotic ce...
Which of these statements about light microscopy are correct? 1 The greater the resolution of a light microscope, the greater the detail that can b...
Which type of cell contains the highest proportion of cell structures bound by a single membrane?
The table shows a variety of structures which may be found in cells. Which row shows structures that could be found in the root cells of a plant?
Which of these cell structures are present in Plasmodium? [Figure 5.1]
A student was asked to estimate the concentration of glucose in a solution using the Benedict's test. The student was provided with a 1.0 mol dm⁻³ ...
The diagram shows part of a carbohydrate molecule formed by glucose. [Figure 7.1]
The diagram shows the relationship between some biological molecules. [Figure 8.1]
Which diagram shows the reaction that occurs to join two of the monomers that form cellulose?
Which molecules contain C=O bonds? 1 amino acids 2 fatty acids 3 glycerol
Which row describes a collagen molecule?
A student investigated the hydrolysis of the lipid in high-fat milk, using the enzyme lipase. • 1 cm³ of enzyme solution was added to 10 cm³ of hig...
A student carried out an investigation into the effect of temperature on the rate of an enzyme-catalysed reaction. At each temperature, the substra...
The graph shows how the rate of an enzyme-catalysed reaction depends on the concentration of substrate. [Figure 14.1]
The formula shows how the rate of diffusion across a cell surface membrane can be calculated. surface area × difference in concentration ----------...
The diagram shows part of the cell surface membrane of an active animal cell. [Figure 16.1]
Some epidermal cells from a well-watered plant are placed in three solutions which have different water potentials. Which row correctly shows the s...
One of the chromosomes in a nucleus has a telomere which contains many repeats of the base sequence TTAGGG. This chromosome was extracted from four...
The chromosome content of each daughter cell must be identical to that of the mother cell for successful cell replacement when repairing tissues. W...
Which of these statements about cytokinesis is always true? 1 Cell structures replicate. 2 Cell structures are shared between two cells. 3 Nuclear ...
Which statement is correct about the number of telomeres present in prophase of a human body cell?
Which statement explains why DNA replication is described as semi-conservative?
A section of a DNA molecule has the coding sequence: AGGCAATGGC. Which statements are correct? 1 This coding sequence contains 3 pyrimidines. 2 The...
XNA is a laboratory-made nucleic acid made of nucleotides in which one component has been replaced by chemical X. The chemical X is not found in na...
Which statements about tRNA are correct? 1 Hydrogen bonds between bases temporarily hold tRNA against mRNA. 2 The base sequences in the tRNA molecu...
What is the role of ATP in a companion cell when sucrose is loaded into a sieve tube element?
A potometer was used to measure the transpiration rate of a leafy shoot. What could be the correct units?
The diagrams show transverse sections of parts of a plant. [Figure 29.1] Which structures, labelled 1 to 4, transport water and sucrose?
Which statement explains why the ventricles contract after the atria?
If the left atrioventricular valve in the heart does not close completely it results in blood flowing back into the atrium during ventricular systo...
The graph shows two oxygen dissociation curves, one for a tissue at rest and one for the same tissue during exercise. [Figure 32.1]
Which of these statements about the formation of haemoglobinic acid are correct? 1 It can only occur with the dissociation of oxygen from haemoglob...
Which of these structures contain cartilage and cilia? 1 bronchi 2 bronchioles 3 trachea
What correctly describes the effect of carcinogens on lung tissue that causes a tumour to develop?
Which row identifies both the type of pathogen that causes cholera and the way in which cholera is transmitted from person to person?
Why do people with HIV/AIDS have a higher occurrence of malaria than people without HIV/AIDS?
How many variable regions are there on a typical Y-shaped antibody molecule?
Where are antigens found?