Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
The gene BRCA1 is expressed in breast tissue and in several other tissues of the body. BRCA1 codes for a tumour suppressor protein. This protein is...
[Figure 6.1] is a diagram of part of a mitochondrion.
A student investigated the effect of temperature on the rate of photosynthesis at two different light intensities. The rate of photosynthesis was d...
[Figure 8.1] is a diagram of a sensory neurone.
The Asian common toad, Duttaphrynus melanostictus, arrived accidentally in eastern Madagascar in 2010 on a ship. [Figure 9.1] shows an Asian common...
In mammals, blood glucose concentration is maintained around a set point so that the mammal can function efficiently. This is an example of homeost...
Fig. 1.1 outlines the effect of antidiuretic hormone (ADH) on the cells of the collecting duct. The cell-signalling mechanism of ADH is similar to ...
Phenotypic variation exists in many forms. (a) Some examples of phenotypic variation in plants and animals are described in Table 2.1. Complete Tab...
In plants and humans, the phenotype of an organism is determined by the genotype and the environment. (a) Plants from the genus Primula have differ...
Genetic engineering is a technique used to modify the genetic material of a specific organism to change a characteristic.
BRCA2 is a tumour-suppressor gene. Its gene product, BRCA2, is involved in DNA repair. If the DNA cannot be repaired, BRCA2 has a role in causing t...
(a) Experiments were carried out to determine the effect of light intensity on the rate of photosynthesis of a species of the unicellular protoctis...
(a) Fig. 8.1 is a diagram of a mitochondrion. [Figure 8.1]
(a) Fig. 9.1 shows how the mean global atmospheric carbon dioxide concentration has changed over the 800000 (800 ×103) years leading up to the year...
(a) Fig. 10.1 is a diagram of part of a neurone membrane while the resting potential is maintained. [Figure 10.1]
A student investigated the effect of wind speed on the rate of transpiration. The student used the flowering plant Japanese spiraea, Spiraea japoni...
The responses of plant species to water stress can be classified as either isohydric or anisohydric. • Isohydric plant species close stomata during...
Female mosquitoes feed on human blood. Some species of mosquitoes are vectors of human pathogens. For example, female mosquitoes of the species Aed...
Tree plantations are areas where trees are planted for a particular purpose. Some tree plantations increase the supply of wood for construction and...
Tumours may be described as benign or malignant. Malignant tumours can lead to greater complications for the person with the tumour. Early identif...
Blood vessels must be able to withstand and maintain varying blood pressures. There are several methods that could be used to determine the strengt...
Gibberellins are a group of plant hormones that are involved in the elongation of plant stems. A student investigated the effect of two different c...
Which row shows possible uses of an eyepiece graticule?
Which statement about a light microscope is correct?
The electron micrograph shows a cell. [Electron micrograph of a cell] What is the actual maximum length of the cell?
The table compares some biochemical molecules of P, Q, R and S. Which row correctly identifies P, Q, R and S?
Which cell structures contain enzymes and are enclosed by a double membrane? 1 nucleus 2 mitochondrion 3 chloroplast
What is the order of size of cell structures?
A sample of a solution of sucrose tested for reducing sugars remains blue, but when another sample of the same solution is tested for non-reducing ...
Which molecules contain at least two double bonds? [Figure 8.1 (Venn diagram showing circles for collagen, saturated triglyceride, haemoglobin, wit...
Amylose, amylopectin and glycogen are all polysaccharides. Enzyme X removes one maltose molecule at a time from the ends of a polysaccharide molecu...
Which property of water enables sweating to be an efficient means of losing heat from the body?
Which bonds are found in the levels of structure of a protein molecule?
Prokaryotes and eukaryotes use extracellular enzymes. Extracellular digestive enzymes are found in the external environments of some prokaryotes. S...
Amylase breaks down starch molecules. Which substance will have the same number of molecules for the duration of this reaction?
Which graphs could show the effect of pH on the rate of enzyme-catalysed reactions? [Figure 14.1 (four graphs of rate of reaction vs pH)]
After a heart attack, the enzyme lactate dehydrogenase leaks into the blood plasma from damaged heart muscle. What is required to measure the activ...
Which graph correctly shows Km and Vmax? [Figure 16.1 (four graphs showing rate of reaction vs concentration, with Vmax and Km indicated)]
Cell membranes become less fluid as the temperature decreases. Bacteria and yeast cannot regulate their cell temperatures. How do bacteria and yeas...
Samples X, Y and Z are epidermal tissues cut from an onion. Each epidermal tissue was immersed in one of three different concentrations of a salt s...
The graph shows the results of an osmosis investigation using potato tissue. [Figure 19.1 (graph of percentage change in mass vs concentration of s...
Some agar was coloured pink using a pH indicator. The pink agar was then used to make three agar cubes with different dimensions. [Figure 20.1 (thr...
The diagram shows the arrangement of chromosomes with attached spindle fibres during a stage of mitosis. [Figure 21.1 (diagram of chromosomes with ...
During which phase of the cell cycle does DNA replication take place?
Human body cells in interphase have 46 chromosomes. What is correct about the number of telomeres present in prophase of a human body cell?
Sometimes hydrogen bonds form temporarily between the bases of two strands of RNA. How many hydrogen bonds form when guanine and uracil each bind t...
The table shows all the possible DNA triplet codes for some amino acids. amino acid: cysteine, DNA triplet code: ACA amino acid: cysteine, DNA trip...
Which row is correct for transpiration?
Which features of companion cells and xylem vessel elements make them suitable for their function?