Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
The diagram shows part of the nitrogen cycle. [Figure 9.1] Which sequence of numbers correctly shows the roles of different types of microorganism ...
Two species of animal are found in the same area of forest and grassland. In the spring and summer they eat the same plant food. However, in the au...
The diagram shows a tropical ocean food chain with 10% efficiency of energy transfer between trophic levels. phytoplankton → herbivorous zooplankto...
The diagram below is drawn from an electron micrograph of an animal cell. [Figure 12.1] Which represents the same cell, seen under a light (optical...
The diagram shows a stage micrometer, with divisions 0.1 mm apart, viewed through an eyepiece containing a graticule. [Figure 13.1] What is the are...
Which observations suggest that a cell is eukaryotic?
Which structures are found in both animal and plant cells? 1 centriole 2 lysosome 3 nucleolus 4 vacuole
Which structures are measured using these units?
When making measurements in experiments, which methods have parallax errors? 1 using a calibrated eyepiece graticule to measure length 2 using a me...
Membranes within and at the surface of cells have different roles. The diagram allows the identification of the various organelles within the cell,...
The diagram shows chromosomes at metaphase of mitosis. [Figure 19.1] What are the diploid and haploid numbers for this species?
DNA is said to replicate in a semi-conservative way. Results of Meselson and Stahl's experiments gave overwhelming support to this theory. They use...
What occurs in anaphase of mitosis?
In a DNA molecule, the base sequence AGT codes for the amino acid serine. What is the base sequence of the anti-codon on the tRNA to which serine b...
What is the minimum number of base substitutions required to change the nucleotide sequence of the HbA (normal) allele to the HbS (sickle cell) all...
An enzyme is completely denatured at 50 °C. A fixed concentration of this enzyme is added to a fixed concentration of its substrate. The time taken...
The enzyme lysozyme secreted from tear glands forms deposits on contact lenses. Which ingredient would be effective in a contact lens cleaner for r...
A student tested four samples of food, A, B, C and D, for the presence of • lipids • protein • reducing sugars • starch One of the food samples, mi...
Which diagram represents part of the ring form of a molecule of β-glucose?
Which statement describes how the molecular structure of starch is suited to its function?
Which feature distinguishes starch from glycogen?
How many fatty acid residues are normally present in a phospholipid molecule?
As a frozen lake warms after a cold winter, mineral nutrients are brought to the surface. Which properties of water contribute to this process? 1 I...
What would be the result of analysing part of a DNA molecule?
What are the causative agents of cholera, malaria and TB?
What is a difference between T-lymphocytes and B-lymphocytes in the immune system?
In an investigation into the immune response, a volunteer was exposed to two different antigens, X and Y. The relative antibody concentration in th...
40% of the world's population live in an area where malaria is a threat to health. In recent years there have been many more cases in Africa. What ...
What is systolic blood pressure?
Aortic stenosis is a heart valve disorder in which the aortic semi-lunar valve opening is narrow. Which effect could aortic stenosis have on the he...
The trace represents the electrical activity of the heart during a single heart beat. [Figure 39.1] Which letters identify the flow of current thro...
The diagram shows a spirometer trace with tidal volume and vital capacity. [Figure 40.1] What happens to the volumes labelled X and Y during modera...
Using a stage micrometer scale, one unit of an eyepiece graticule was calculated as 0.005 mm. The diameter of a spongy mesophyll cell was counted a...
Membranous sacs containing products of metabolism are formed by the endoplasmic reticulum in cells. Where are these products used?
Visking tubing is an artificial partially permeable membrane used to demonstrate diffusion. Glucose molecules can pass through the pores in the mem...
Which of the structures are found in photosynthetic prokaryotes? 1 cell surface membrane 2 cellulose wall 3 mesosomes 4 ribosomes 5 chloroplasts
A human aorta has a lumen width of 2 cm. A human red blood cell has a diameter of 7 µm. How many red blood cells could be laid end to end across th...
Which polysaccharides are branched and which are unbranched? [Figure: Table with columns 'branched' and 'unbranched']
Three carbohydrate molecules are shown. [Figure: Three chemical structures labelled 1, 2, 3] Which two molecules combine to form a molecule of sucr...
At which levels of protein structure do ionic bonds occur? 1 secondary 2 tertiary 3 quaternary
Myoglobin is a protein with a similar function to haemoglobin. However, myoglobin does not have a quaternary structure. Why does myoglobin not have...
The diagram shows the structure of the amino acid cysteine. [Figure: Chemical structure of cysteine] When two of these amino acids join together wh...
Which row describes a triglyceride? [Figure: Table with columns 'hydrophilic' and 'insoluble in alcohol' and symbols ✓ or x. Key: ✓ = correct, x = ...
The graph shows the activation energy of an enzyme-catalysed reaction and the same reaction without a catalyst. [Figure: Graph showing energy vs re...
Which of the following statements are true of all enzymes? 1 soluble in water 2 catalyse the breakdown of large molecules into smaller molecules 3 ...
The graphs show the effects of temperature and pH on enzyme activity. [Figure: Two graphs, one of rate of reaction vs temperature with points P and...
The diagram shows part of a cell surface membrane. [Figure: Diagram of a cell surface membrane with labelled components 1, 2, 3, 4, 5] Which molecu...
Increasing which type of bond helps to increase the fluidity of the cell surface membrane?
When cylinders of potato tissue were immersed in a 0.35 mol dm-³ sucrose solution, they showed no change in mass. What will happen when cylinders a...
The graph represents the changes in the quantity of DNA present in one nucleus at different stages in the life cycle of a mammal. [Figure: Graph sh...