Cambridge & Pearson Edexcel Past Paper Questions
Browse 35,704 questions from Cambridge O-Level & A-Level and Pearson Edexcel IGCSE & IAL exams. Click any question to practice.
A farmer grows a different crop in a field each year for three years. In the fourth year he grows a leguminous crop, such as clover, and then ploug...
Of the prey consumed by the lion, into which box does the largest amount of energy flow?
A student was presented with a photomicrograph of a cell organelle. The magnification of the photomicrograph is known. Which calculation of the act...
Which statements about both mitochondria and chloroplasts are correct? 1 They contain 80S ribosomes. 2 They contain circular DNA molecules. 3 They ...
A scientist carried out an experiment to separate the organelles in an animal cell by mass. The scientist mixed the cells with a buffer solution wh...
Which row shows the monomer and type of bond that form the polymer?
Which biological molecules always contain the element nitrogen?
Which statement about the quaternary structure of proteins is correct?
Which set of statements correctly describes haemoglobin?
The diagrams show different types of bond found in biological molecules. [Figure 9.1] Which bonds are found in proteins with a tertiary structure?
In two investigations, the rate of an enzyme-catalysed reaction was measured in the presence of either a competitive inhibitor or a non-competitive...
Two enzymes, X and Y, were used in an experiment. Enzyme X was from bacteria that live in rivers and lakes at temperatures from 5°C to 20 °C. Enzym...
What is a function of the cholesterol in a cell surface membrane?
Which roles of the cell surface membrane are a result of the properties of the phospholipids? 1 to allow cytokinesis to occur in mitotic cell divis...
Which statements about active transport are always correct? 1 It does not require a membrane. 2 It occurs against the concentration gradient. 3 It ...
There is a high concentration of molecule X outside the cell which enters the cell by facilitated diffusion. The results of measuring the concentra...
The photomicrographs show cells in various stages of the cell cycle. [Figure 16.1] Which cells contain twice as many DNA molecules as a cell from t...
A group of chemicals used to treat cancer prevents the formation of the spindle during mitosis. Which phase of mitosis is the first to be affected?
Mitosis is an important process for organisms. Which features of mitosis are important for single-celled organisms? 1 asexual reproduction 2 growth...
Which statements about complementary base pairing are correct? 1 Cytosine forms three hydrogen bonds with guanine. 2 Purines and pyrimidines are di...
Bacteria were grown in a medium containing 15N. After several generations, all of the DNA contained 15N. Some of these bacteria were transferred to...
Which statements about tRNA are correct? 1 It contains base pairing. 2 It contains hydrogen bonds. 3 It contains uracil. 4 It is single stranded.
The diagram shows the nucleotide sequence of a small section of a gene which is transcribed. TTCTTCCCGTTC The table shows the amino acids coded for...
The graph shows the diameter of a tree trunk at different times. [Figure 23.1] Which statement is correct?
Some plant species can take up toxic heavy metal ions that are dissolved in water in the soil. These ions accumulate in the aerial parts of the pla...
The diagram shows the results of an experiment on transpiration using two different leaves. Each leaf was left on a balance in daylight in a closed...
Which statement about the transport of sucrose is correct?
Which of the tissue types below are present in the walls of all blood vessels? 1 collagen 2 elastic 3 endothelial 4 smooth muscle
Which components of blood are present in tissue fluid?
The graph shows changes in percentage saturation of haemoglobin with oxygen in the blood of a human and of another animal. The partial pressure of ...
Which statements about the formation of haemoglobinic acid are correct? 1 It can only occur with the dissociation of oxygen from haemoglobin. 2 It ...
The photograph shows a type of blood cell. [Figure 31.1] Which statements about these cells are correct? 1 Oxygen diffuses through the phospholipid...
A student was asked to describe the differences between four microscope slides of sections taken from different parts of the gas exchange system. s...
Which components of the human gas exchange system help to reduce the effects of carcinogens in tar?
What is correct about the affinity between haemoglobin and the gases carbon dioxide, carbon monoxide and oxygen?
The table shows the names of five pathogens. [Figure 35.1] Which row matches the pathogens with the diseases they cause?
Which disease exhibits all the following features? • It can be transmitted by animals to other animals, including humans. • One mode of transmissio...
The proportion of the local population who have malaria in area R is higher than the proportion in area S. Which factor causes this difference?
Which statement describes how passive natural immunity is obtained?
What describes a non-specific immune response?
What explains why monoclonal antibodies can be used to target cancer cells?
Which organelles are enclosed in a single phospholipid bilayer and contain hydrolytic enzymes?
The DNA of prokaryotes is naked and circular. Which statement describes how the DNA of eukaryotes differs from that of prokaryotes?
The recently discovered Pandoravirus measures 1000 nm in diameter. The Mimivirus has a diameter of 400 nm. What can be detected using a light micro...
What are found in chloroplasts and mitochondria? 1 DNA 2 70S ribosomes 3 mRNA
Boiling the bones and teeth from dead animals can be used to produce a type of glue. The glue is formed from the collagen fibres present in bones a...
What describes the primary structure of a protein?
The diagrams show four monosaccharides with the formula C6H12O6. Which diagram shows α-glucose? [Diagrams of four monosaccharides labeled A, B, C, D]
Complete digestion of polysaccharides requires all the glycosidic bonds between the monomers to be broken. Amylase only breaks α-1,4 glycosidic bon...
The diagram shows the results of tests on four solutions containing biological molecules. Which shows the solution that contains only starch and pr...