Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
Fig. 6.1 outlines the first three stages of respiration in aerobic conditions. [Figure 6.1]
California salamanders are terrestrial amphibians. An original population of California salamanders occupied an area of forest in northern Californ...
The Bowman's capsule of a nephron is involved in ultrafiltration. Fig. 1.1 is a diagram of part of a Bowman's capsule and glomerulus. [Figure 1.1] ...
Scientists are researching new ways to reduce the global atmospheric carbon dioxide (CO2) concentration. There are concerns that an increasing atmo...
During the germination of barley seeds, amylase is produced.
Genome-wide association studies find links between single nucleotide polymorphisms (SNPs) and phenotypic features such as human diseases. SNPs are ...
Biodiversity can be considered at three different levels. Fig. 5.1, Fig. 5.2 and Fig. 5.3 are images that show these three different levels of biod...
ATP is needed for many metabolic processes in living organisms. [Figure 6.1]
The Labrador is a variety of domestic dog. Labradors have fur that can be brown, black or yellow. In Labradors, TYRP1 is one gene that codes for fu...
Twenty million years ago, an ocean covered the area where the country of Panama is now located. There was a gap between the continents of North Ame...
Fig. 1.1 is a diagram of a kidney nephron and some of its blood vessels. [Figure 1.1]
Baker's yeast, Saccharomyces cerevisiae, has two metabolic pathways for the production of ATP, aerobic respiration and fermentation. Oxygen is not ...
Species diversity is often used as a simple way to compare the biodiversity of different regions of the world. A student read that species diversi...
Some students researched how yeast, Saccharomyces cerevisiae, is used in the food industry. The students found that in different manufacturing proc...
Fig. 2.1 shows a gray tree frog, Dryophytes versicolor. [Figure 2.1] Males of this species make a very distinctive mating call. Some male gray tre...
The diagram shows a stage micrometer, with divisions 0.10mm apart, viewed through an eyepiece containing a graticule. [Diagram] The area of the fie...
Where are cisternae found in a cell? 1 endoplasmic reticulum 2 Golgi body 3 mitochondria
Which row matches the functions to the cell structures?
Which structures are found in prokaryotes and eukaryotes?
Which molecules are present in all viruses? 1 thymine 2 adenine 3 cytosine
The table shows the observations recorded from tests for biological molecules on four samples, A, B, C and D. Which conclusion is correct?
The diagrams show some biological molecules. [Diagrams A, B, C, D] Which biological molecule forms a polymer with a structural role in plants?
Which molecule is a disaccharide and a reducing sugar?
The diagram shows bonding in part of a polysaccharide. [Diagram] Which type of glycosidic bond is shown at position X?
Which statements about triglycerides and phospholipids are correct? 1 Fatty acids in a triglyceride may be saturated or unsaturated but in a phosph...
Silk moth caterpillars have been genetically modified to produce a mixture of their own silk and the much stronger spider silk of the golden orb we...
Which property of the tertiary structure of a globular protein enables it to catalyse a metabolic reaction?
A student investigated the effect of substrate concentration on the activity of an enzyme. The graph shows the results of this investigation. [Grap...
The Michaelis–Menten constant, Km, is the substrate concentration at which an enzyme works at half its maximum rate. What is correct when the Km va...
Which functions are performed by glycoproteins on the surface of a cell surface membrane? 1 to act as enzymes catalysing reactions in the membrane ...
The diagram represents a process by which molecules move out of a cell through a cell surface membrane. [Diagram] Which process does this represent?
Which processes that occur in the cell cycle are represented in the diagram? [Graph]
A gene codes for the production of a protein, p53, that binds to damaged DNA during interphase and prevents its replication. A carcinogen in cigare...
Stained onion cells undergoing mitosis were observed using a microscope. Which row is correct for mitosis in plant cells?
How many statements about semi-conservative replication of DNA in a eukaryotic cell are correct? 1 The process takes place in the cytoplasm. 2 An a...
A section of the polypeptide coding for the haemoglobin β-chain contains the following amino acids. – Pro – Glu – Glu – Patients with sickle cell a...
Which diagram correctly represents temporary hydrogen bonding during transcription?
The electron micrograph shows a longitudinal section through part of a plant stem. [Electron micrograph] What is X?
Sodium chloride is added to a culture solution containing freshwater single-celled plant cells. What happens to the water potential of the culture ...
Which statements correctly describe transport pathways in dicotyledonous plants? 1 In the apoplast pathway, water may move through plasmodesmata. 2...
Which statement about the movement of water from roots to leaves is not correct?
Which terms describe the method by which water is transported within xylem vessel elements? 1 cotransport 2 cohesion-tension 3 osmosis
The photomicrograph shows a blood smear. [Photomicrograph] Which cell is a monocyte?
The table shows some information about three blood vessels, P, Q and R, from a mammal. Which row identifies blood vessels P, Q and R?
Ventricular septal defect (VSD) is a heart defect that people can have from birth. People with VSD have a hole in the wall (septum) that separates ...
Which statement about the structure of the heart is correct?
What can be found in the wall of an alveolus in the lungs of a human?
What are the functions of cilia in the gas exchange system? 1 to move mucus 2 to trap pathogens and dust 3 to increase the surface area