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) State the general theory of evolution. (b) Different types of organism have evolved different structures containing light receptors. Eyes are o...
Define the term ecosystem.
(a) Oxidative phosphorylation takes place in the mitochondrion. Table 8.1 shows the different stages of oxidative phosphorylation. The stages are n...
(a) Fig. 1.1 shows a cholinergic synapse. presynaptic knob [Figure 1.1]
Albinism is a condition that results from disruption of a biosynthetic pathway involving the enzyme tyrosinase. It is estimated that 1 in 17000 peo...
The cilia of ciliated epithelial cells show variation in length, within an individual and between different individuals. Samples of ciliated epithe...
Rice, Oryza sativa, is an important food crop for human consumption. Two varieties of rice are T2A-1 and Shanyou 2. Shanyou 2 has been developed in...
(a) Fig. 5.1 is a photograph of a section through a kidney. [Figure 5.1]
(a) Regressive evolution is a change in a population over time that involves the loss of certain phenotypic characteristics. It is thought to be ca...
The passage below outlines one method used by a student to estimate the population size of an animal species. Complete the passage by using the mos...
(a) Table 8.1 shows some of the stages of glycolysis and respiration in anaerobic conditions in yeast. The stages are not listed in the correct ord...
A group of six students carried out an experiment to determine their reaction times using a ruler. Fig. 1.1 shows the basic procedure used for the ...
Artificial insemination (AI) is one method used in assisted reproduction programmes for large mammals. For many years, horse breeders have collecte...
Some students wanted to determine the reaction time of a sample of people aged from 5–80 years. The students found three different methods of testi...
Sperm production in humans is controlled by the hormones FSH and LH. These hormones are released from the pituitary gland in males to maintain a co...
One method of testing a person's reaction time is to use an online, computer click timer test. Some students carried out a test using the method de...
For many years, farmers have used artificial insemination (AI) as a method to improve the milk yield of dairy cattle. In cattle, sperm cells carryi...
What is the definition of the resolution of a light microscope?
The electron micrograph shows a type of virus at a magnification of ×30 000. [Figure 2.1] What is the length of the virus?
Which row correctly shows a feature of a cell structure? [Figure 3.1]
Four students were asked to match the function with the appearance of some cell structures in an animal cell. The functions were listed by a number...
The features of some cells and cell structures that make ATP are listed. 1 has outer boundary membrane and folded inner membrane 2 has peptidoglyca...
Mitochondria are thought to have evolved from prokaryotic cells that were ingested by an ancestral cell. Which feature have these prokaryotes lost ...
A student carried out the Benedict's test on a sample and got a negative result. What should the student do to confirm there are no sugars present ...
The diagrams show three hexoses. [Figure 8.1] In which carbohydrates do these three hexoses occur? [Figure 8.2]
The diagram shows part of the chemical structure of a naturally occurring polysaccharide. [Figure 9.1] What types of glycosidic bonds are present?
What is the maximum number of water molecules produced when a triglyceride is synthesised?
What occurs during the formation of a peptide bond between two amino acids?
The diagram represents roles of water in living organisms. [Figure 12.1] Which roles are dependent upon hydrogen bonds between water molecules?
The diagram shows a metabolic pathway. [Figure 13.1] What would be the effect of adding a small amount of a non-competitive inhibitor of enzyme 2?
Two enzymes are added to a solution containing a low concentration of a substrate that they can both use. Which statement is correct?
The diagram shows the fluid mosaic model of membrane structure. Structures 1, 2, 3 and 4 are types of molecule. [Figure 15.1] Which types of molecu...
What is the role of G protein in cell signalling?
When a small quantity of phospholipid is added to a test-tube of water and then shaken vigorously, an emulsion is formed by small droplets called l...
What are the features of facilitated diffusion? 1 It uses protein channels in the membrane and is driven by the energy from ATP. 2 It moves molecul...
Which description of chromosome structure is correct?
Which processes involve mitosis? [Figure 20.1]
A drug has been developed to treat certain types of cancer. It prevents mitosis by binding to the spindle and preventing sister chromatids being se...
Some viruses have single-stranded DNA as their genetic material. This DNA molecule has to be folded to fit in the protein coat. Which statements ab...
How many statements are true for semi-conservative replication of DNA in a eukaryotic cell? 1 The process takes place in the nucleus. 2 Adenine wil...
Part of the nucleotide sequence of an mRNA molecule is shown, with spaces between the codons. CAG UAC AGC AAU CUA UAA The translation of the codons...
External factors change the rate of transpiration, which also affects the water potential gradient of cells in the leaf. Which combination is corre...
The photomicrograph shows a transverse section through a leaf. [Figure 26.1] Which features of a xerophytic leaf are visible in this section? 1 sun...
Which changes occur as carbohydrates move out of a root cell into a phloem sieve tube? [Figure 27.1]
The photomicrograph shows three white blood cells labelled X, Y and Z. [Figure 28.1] Which row correctly identifies these cells? [Figure 28.2]
The graph represents data on blood vessels and blood flow. [Figure 29.1] Which row correctly identifies the curves? [Figure 29.2]
Which components of blood are present in lymph? [Figure 30.1]
What correctly describes the significance of the increase of the red blood cell count of humans who move from living at low altitude to high altitude?
Which structures of the human gas exchange system are supported by cartilage? [Figure 32.1]
Carbon monoxide, nicotine and tar are components of tobacco smoke. Which row correctly describes their effect on a smoker's body? [Figure 33.1]