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 diagram represents a nucleotide containing adenine. Which statements about this nucleotide are correct? 1 The carbohydrate is a pentose. 2 The ...
Which row is correct for the replication of a DNA molecule? [Figure 24.1]
Some students were asked to look at the photomicrograph of a cross-section of unfamiliar material and describe what they could see. The students de...
The diagram shows the relationship between phloem sieve tube elements, xylem vessel elements and companion cells. Which row correctly identifies wh...
Why does an air bubble in a xylem vessel element stop the flow of water? 1 loss of adhesion 2 loss of cohesion 3 collapse of xylem vessel element
Which changes to the water potential and the volume of solution in a phloem sieve tube occur when amino acids are moved into a sink from the phloem...
Which feature of some xerophytic leaves reduces the rate of transpiration by decreasing the water potential gradient between the internal leaf surf...
The diagram shows a cross-section through a mammalian heart. Which chambers of the heart are represented by G and H? [Figure 30.1]
Blood entering the heart from the vena cava passes through, or past, several structures before entering the lungs. Five of these structures are inc...
The bar charts show the quantity of endothelial tissue, elastic tissue and muscle tissue in the walls of three blood vessels, P, Q and R. Which row...
The maximum pressure in each of the four chambers of a healthy human heart was recorded during one cardiac cycle. The maximum pressures recorded we...
The graph shows the pressure changes in three structures of the right side of the heart during the cardiac cycle. What is represented by the line l...
Which statement helps to explain why there is no cartilage in the walls of the bronchioles?
The photomicrograph shows a cross-section of part of the gas exchange system of a mammal. What is shown by the line labelled V? [Figure 36.1]
Which feature of the disease cholera decreases the spread of the pathogen Vibrio cholerae?
Which row shows how penicillin kills bacteria? [Figure 38.1]
In the hybridoma method, what is grown by cell culture to produce monoclonal antibodies?
Which type of immunity does a baby have at birth?
(a) Table 1.1 shows three of the processes by which substances in solution can move across cell membranes. It also lists five statements that may a...
(a) Fig. 2.1 shows a cell at one of the main stages of mitosis in the mitotic cell cycle. [Figure 2.1] (b) State the role of telomeres during DNA r...
(a) Enzymes are polymers of amino acids. Complete Fig. 3.1 to show the general structure of an amino acid. [Figure 3.1] (b) When bananas are peeled...
Tuberculosis (TB) is a major cause of ill health worldwide. (a) State the name of a bacterium that causes TB in humans. (b) Fig. 4.1 is a scanning ...
Control of heartbeat is myogenic. This means the electrical activity controlling the rhythm of a regular heartbeat begins in the heart muscle itsel...
Fig. 6.1 is a diagram showing the structure of part of a DNA molecule. [Figure 6.1] (b) Fig. 6.2 shows the RNA base sequence of a short length of p...
You will investigate the water potential of potato cells. When pieces of potato are put into a sucrose solution, water will move by osmosis into an...
J1 is a slide of a stained transverse section through a plant stem.
The European hedgehog, Erinaceus europaeus, is a small omnivorous mammal. Its body is covered in spines, which are usually brown. A rare variant, w...
Giant axonal neuropathy (GAN) is a rare autosomal recessive disease, which affects neurones. (a) Mitochondria can move freely within the axons of n...
The red blood cells of people with sickle cell anaemia have reduced oxygen-carrying capacity.
(a) Meiosis is an important process that contributes to genetic variation in a population. Fig. 4.1 shows a pair of homologous chromosomes during p...
Factor VIII can be made as a recombinant human protein.
(a) The banana plant, Musa acuminata, is a tall herbaceous plant with very large leaves. Fig. 6.1 shows a banana plant. [Figure 6.1] An investigati...
(a) In aerobic respiration, ATP is synthesised by substrate-linked reactions and by oxidative phosphorylation. Outline the process of oxidative pho...
Natural selection and artificial selection (selective breeding) both have important roles in evolutionary change. (a) Seahorses are fish with an un...
Describe the biological species concept.
10 (a) Fig. 10.1 shows the structure of two guard cells. [Figure 10.1]
Some students wanted to investigate the effect of light intensity on the rate of photosynthesis in the Brazilian waterweed, Egeria densa. This plan...
An invasive alien species is a species that has been introduced into an ecosystem where it is not normally found and causes harm to this ecosystem....
Mussels, Mytilus edulis, are molluscs that live in sea water on the shorelines of coastal regions around the world. Mussels are a popular seafood a...
The photomicrograph shows cells from a human blood smear. [Figure 1.1] Which calculation shows a correct method to calculate the actual diameter of...
A student calibrated an eyepiece graticule using a stage micrometer. • Each division of the stage micrometer was 0.01 mm. • With a ×10 magnificatio...
Which statements are correct for chloroplasts and also for mitochondria? 1 They contain 80S ribosomes. 2 They can transcribe their circular DNA. 3 ...
The electron micrograph shows some cells from a root. Which cell structure is not usually found in cells from a root?
Dialysis (Visking) tubing is an artificial partially permeable membrane with pore sizes of approximately 2.5 nm. Glucose molecules have a diameter ...
What is present in all viruses?
To estimate the concentration of glucose in an unknown solution, equal volumes of a range of known concentrations of glucose were each mixed with t...
Which statements are correct for amylose and also for amylopectin? 1 They are carbohydrate molecules. 2 They are formed by condensation reactions. ...
Which statement is a correct comparison between saturated triglyceride molecules and unsaturated triglyceride molecules of approximately the same m...
The diagram represents a molecule from a cell surface membrane. [Figure 10.1] Which description of one of the labels is correct?
Which row correctly shows levels of protein structure that can be held together by each type of interaction?