Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
Red deer are herbivores common in the highlands of Scotland. They have no natural predators and in some areas culling of the deer is carried out in...
Sodium hydrogencarbonate indicator solution contains sodium hydrogencarbonate. Some students found out on the internet that this indicator solution...
Lionfish are a type of fish native to the tropical waters of the Indian Ocean and Pacific Ocean. Lionfish were first reported off the south east co...
The actual length of a cell structure is 8 µm. Which steps are used to calculate the magnification of an electron micrograph of this cell structure...
What is the typical resolution of a microscope using daylight as a light source with a ×10 eyepiece lens and a ×40 objective lens?
Two different types of cell, P and Q, were broken up using ultrasound and their contents analysed. Both types of cell contained small circular DNA....
Which features shown in the diagram can be present in viruses? [Figure: Diagram showing a central 'feature' connected to 1 DNA, 2 protein coat, 3 7...
After boiling a sample of milk with Benedict's solution, a yellow colour is observed. Which conclusion about the sample of milk is correct?
Which of the statements about polysaccharides can be used to describe amylose and cellulose? 1 contains 1,4 glycosidic bonds 2 contains 1,6 glycosi...
Which diagram shows the formation of a peptide bond?
In enzyme-catalysed reactions, the position of the amino acids found at the active site is important. During the synthesis of enzymes, amino acids ...
Which features affect the tensile strength of collagen? 1 the helical structure of collagen chains 2 the small R group of the amino acids in collag...
A fixed volume of the enzyme catalase was added to a fixed volume of hydrogen peroxide solution. The diagram shows how the concentration of product...
A fixed volume and concentration of substrate and enzyme were mixed. All other variables were kept constant. The enzyme-catalysed reaction was left...
The fatty acids elaidic acid and oleic acid have exactly the same structural formulae, with one double bond in the chain. However, the shapes of th...
The diagram shows a cell surface membrane. [Figure: Diagram of cell surface membrane with labelled molecules W, X, Y, Z] Which is a correct role fo...
The diagram shows a simple cell signalling pathway in which a signal molecule leads to a response, such as a secretion. [Figure: Flowchart signal m...
Three parts of a chromosome and their functions are listed. part function P1 centromere F1 holds the coils of DNA together P2 histone proteins F2 h...
The enzyme telomerase prevents loss of telomeres after many mitotic cell cycles. Which cells need to transcribe telomerase enzyme? 1 cancer cells 2...
The diagram shows some of the stages which take place during the cell cycle. [Figure: Flowchart showing cell cycle stages] Which two stages take pl...
Which statement correctly describes the base pairing in a molecule of DNA?
Which statements about complementary base pairing are correct? 1 It allows translation to occur. 2 Purines and pyrimidines are the same size. 3 The...
The diagram shows the possible organisation of DNA molecules after one replication. Which organisation is correct?
The diagram shows part of the DNA sequence of a gene and a mutated sequence of the same gene. normal DNA sequence ...CCG GAT TAT TGC GAG AAA TGG CA...
What is correct for phloem sieve tube elements?
The statements are descriptions of how water moves across the root to the xylem vessel elements. 1 Water enters cell walls. 2 Water enters cytoplas...
Four plants, A, B, C and D, were grown in the same conditions and their transpiration rates measured. [Figure: Graph showing transpiration rate for...
Sucrose moves from a mesophyll cell in a leaf into a phloem sieve tube element. Which changes to the water potential and the volume of liquid in th...
The diagram shows a cross-section through a mammalian heart. [Figure: Cross-section of a mammalian heart with W and X labelled] Which chambers of t...
At a certain point in a cardiac cycle, the pressure in the right ventricle is lower than that in the right atrium and lower than that in the pulmon...
The diagram shows the pathway for the transport of carbon dioxide that occurs in red blood cells. [Figure: Diagram of CO2 transport pathway] Which ...
The diagram shows a transverse section through an artery. [Figure: Transverse section through an artery with layer X labelled] Which statement desc...
The large arteries close to the heart have a thick elastic layer in their walls. Which statements about this layer are correct? 1 helps to maintain...
Which tissues are present in the walls of a trachea and an alveolus?
The surface tension of the layer of liquid lining the alveoli tends to pull the walls inwards so alveoli could collapse. Which statements could exp...
The diagram shows some of the effects of nicotine and carbon monoxide in cigarette smoke. [Figure: Venn diagram showing overlapping effects of nico...
Which row correctly identifies the causative organism of each disease?
The following advice was given to a person travelling to a country where there had been an outbreak of an infectious disease. • cook food well and ...
What is a social factor that affects the spread of malaria?
Which are specific immune responses? 1 phagocytosis 2 production of antibodies 3 production of memory cells
Newborn babies have natural passive immunity. What is correct for this type of immunity?
The diagrams show three different types of antibody structure. [Figure: Diagrams of IgG, IgA, IgM antibody structures] Which row is correct?
Antibody molecules are proteins that show primary structure, secondary structure, tertiary structure and quaternary structure. [Figure 1.1] shows ...
Linoleic acid is an unsaturated fatty acid that is found in some triglycerides and some phospholipids. Phospholipids are components of cell membran...
Neutrase® is an enzyme that is used to hydrolyse proteins in solution. When the enzyme is mixed with a 2% protein solution the reaction mixture cha...
Meristematic tissue is found in the growing regions of plants, such as shoot tips. Meristematic cells have a similar role to stem cells in animals....
The mammalian circulatory system is described as a closed double circulation. Explain why it is called a closed and double circulation. closed d...
The DNA in the nucleus is known as nuclear DNA.
Fig. 1.1 is a photomicrograph of a low power image of part of the common sunflower, Helianthus annuus. Fig. 1.1 is a transverse section. [Figure 1.1]
Some tissues of the gas exchange system include cells that are able to produce and secrete mucins. Mucins are stored in vesicles in these cells, re...