Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
In an enzyme-catalysed reaction, which combination of inhibitor and substrate would result in the highest rate of reaction? [Table 12]
Following a heart attack, the enzyme lactate dehydrogenase leaks into the blood plasma from damaged heart muscle. Which steps are required to obtai...
Red blood cells were placed in a solution of sodium chloride with a less negative water potential than the cell contents. Haemoglobin was released ...
The table shows three processes that contribute to transport across cell surface membranes. Which processes are the result of random movement of mo...
The cell surface membranes of plants adapted to cold conditions change as the weather gets colder, allowing the plants to carry out exocytosis. Whi...
Which statements about a diploid cell are correct? 1 can divide by mitosis to repair itself 2 possesses two complete sets of chromosomes 3 undergo...
Meiosis and mitosis are two types of cell division. A cell has 20 chromosomes before it divides. How many chromosomes will it have after dividing b...
The graph shows the length of the spindle fibres during mitosis. [Figure 19] Which region of the graph shows when the centromeres detach from the s...
In a genetic engineering experiment, a piece of double-stranded DNA containing 12 × 10³ nucleotides coding for specific polypeptide is transcribed ...
The diagram shows part of a DNA molecule. [Figure 22] Which row correctly identifies the structures labelled 1, 2, 3 and 4?
Bacteria were grown in a medium containing 15N. After several generations, all bacteria contained 15N. Some of these bacteria were transferred to a...
The diagram shows pressure changes in the aorta, left atrium and left ventricle during a cardiac cycle. [Figure 24] Which row explains the changes ...
Which row shows the changes in concentration in the red blood cells when carbon dioxide diffuses from respiring cells?
The following are all structural components of blood vessels. 1 collagen fibres 2 elastic fibres 3 endothelial cells 4 smooth muscle cells Which ...
Which components of blood are also present in tissue fluid?
The diagram shows a longitudinal section through transport tissue in a plant stem. [Figure 28] What are the names of the element labelled X and the...
The diagram shows the tissues of the transport system of flowering plants. [Figure 29] Where is the water potential most negative?
Which evidence supports the theory of water movement by root pressure in flowering plants? 1 When the rate of transpiration of a tree is maximum, ...
Cardiovascular disease is said to be multifactorial. What does this mean?
The first diagram shows a spirometer, which is an apparatus used to measure changes in lung volume. The cover rises during exhalation and falls dur...
Which row shows a correct location of cartilage and smooth muscle in the human gas exchange system?
Which observation would indicate a difference between the structure of the gas exchange system of a cigarette smoker and a non-smoker?
Why is passive immunity effective for only a short time?
Within an ecosystem, the top consumers in a food chain are few in number. Which statement explains this?
The diagram shows the flow of energy through a food chain. Figures are in kJ m⁻² year⁻¹. [Figure 39] What percentage of light energy is converted t...
The diagram shows part of the nitrogen cycle. [Figure 40] Which process is increased in poorly drained soil?
Which eyepiece and objective lens combination of a light microscope enables you greatest number of cells in the field of view?
What are the characteristics of a prokaryotic cell?
The following are all features of eukaryotic cells. 1 chloroplast 2 Golgi apparatus 3 lysosome 4 mitochondrion 5 nucleus Which of these has a singl...
Plant cells are fixed, stained and viewed through a light microscope. What would be clearly visible at x400 magnification?
Which size range would include most prokaryotic cells?
The photomicrograph shows some plant tissues and the magnification is ×200. [Figure 6.1] What is the diameter of the cell marked Z?
Heating with which solution breaks glycosidic bonds?
The diagram shows four molecules. [Figure 8.1] Which two molecules condense to form sucrose?
Which molecules have a structural formula that contains C=O bonds? 1 glucose 2 glycerol 3 protein
Which of the statements about polysaccharides can be used to describe both glycogen and amylopectin? 1 contains 1,4 glycosidic bonds 2 contains 1,6...
Which row shows the types of bond found at different levels of protein structures?
What is the role of enzymes in metabolism?
Two enzyme experiments were carried out. The first, experiment X, was carried out at a temperature of 37°C. During the second experiment the temper...
Which role of the cell surface membrane is not a result of the properties of the phospholipids?
An increase in which component would make the cell surface membrane more fluid?
Which processes that move substances across cell surface membranes result in an exchange? 1 active transport 2 diffusion 3 facilitated diffusion 4 ...
Diagrams 1 and 2 show how the transverse section through a leaf changes when moved from one solution W to a different solution Y. [Figure 18.1] How...
Immediately after which stage in mitosis in an animal cell does the cytoplasm start to divide?
The diagram shows a cell of an organism formed by reduction division. [Figure 20.1] What is the diploid number for this organism?
Which is not a description of a gene?
Which row in the table correctly shows situations in which both DNA and RNA are both involved?
The diagram shows the stages in the production of a polypeptide. [Figure 23.1] Which feature of the triplet code is illustrated by the information ...
What is correct about the uptake and transport of water in plants? 1 water transported by the symplast pathway enters root hair cells down a water ...
Which combination of conditions increases the rate of transpiration in plants?