Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
Which letter identifies cell structures where semi-conservative replication of DNA occurs? [Venn diagram showing chloroplasts, mitochondria, nucle...
Which parts of a cell contain ribosomes? 1 chloroplast 2 mitochondrion 3 Golgi body 4 cytoplasm
Which range of cell diameters is typical for prokaryotic cells?
Which row shows a combination of molecules that could be found together in a single isolated virus?
A student carried out four biochemical tests on a sample of food. test: emulsion, observation: cloudy test: Benedict's, observation: yellow test: ...
Which diagram represents a molecule of α-glucose?
Which statements about glycosidic bonds are correct? 1 Condensation between glucose and fructose uses water and forms sucrose. 2 Glycogen contains...
A triglyceride has ......1..... bonds formed by joining fatty acids to .2....... Which row correctly completes this sentence?
The diagram shows a phospholipid molecule divided into three regions, X, Y and Z. R, in region X, represents a range of possible chemical groups. ...
Which statement about collagen is correct?
Catechol is a chemical found in a number of fruits. Catechol can be oxidised to a quinone by the enzyme catechol oxidase. Catechol oxidase is inhi...
Which statements about the fluid mosaic model of a membrane are correct? 1 The movement of phospholipids in the membrane is reduced if the fatty a...
Diagram 1 and diagram 2 show how the transverse section through a leaf changes when the leaf is moved from solution X to solution Y. [Diagram 1 an...
Which features must always be present for water to move between two solutions by osmosis? 1 carrier proteins 2 cell surface membrane 3 selectively...
When living pancreatic cells were placed in a solution of a red stain called neutral red, the cytoplasm became red. The cells were then removed fro...
DNA molecules in a eukaryotic cell must be packaged compactly because their combined length is much greater than the diameter of the nucleus. Whic...
Which statements about mitosis are correct? 1 Mitosis results in genetically identical cells. 2 Mitosis is involved in asexual reproduction. 3 Mit...
A human chromosome is made up of different parts. Some parts of a typical human chromosome are more numerous than others. Which parts are listed i...
A piece of double-stranded DNA containing 12 × 10³ nucleotides is transcribed and translated to produce a single polypeptide. What is the maximum ...
Which statements about complementary base pairing are correct? 1 Cytosine forms two hydrogen bonds with guanine. 2 Purines and pyrimidines are dif...
What are the products when a DNA molecule replicates?
Which descriptions apply to phloem sieve tube elements and to xylem vessel elements? 1 no cytoplasm 2 no end walls 3 no nucleus
Some of the parts of a plant root involved in water transport are listed. 1 Casparian strip 2 cell walls of cortex cells 3 endodermal cells 4 epid...
What is an example of a mass flow system in a plant?
The diameter of a tree trunk usually decreases slightly during the day. Which changes in environmental factors during the day could cause the diam...
Which statement about the role of co-transporter proteins in the movement of sucrose is correct?
Which row correctly describes the heart during atrial systole?
The diagram shows a capillary, some tissue cells and a lymph vessel. [Diagram showing capillary, tissue cells, lymph vessel and arrows labeled 1, ...
The table shows the results used to draw an oxygen dissociation curve for adult haemoglobin. partial pressure of oxygen /kPa: 1, 2, 3, 4, 5, 6, 7 ...
The graph shows the oxygen dissociation curves for adult haemoglobin at two carbon dioxide concentrations. [Graph showing two oxygen dissociation ...
Which substances can combine with adult haemoglobin and reduce the oxygen-carrying capacity of the blood? 1 carbon dioxide 2 carbon monoxide 3 hyd...
How many times must a molecule of carbon monoxide pass through a cell surface membrane as it diffuses from an air space in an alveolus, through a c...
The heart rate of a person at rest was recorded at intervals over two 15-minute periods. During the first five minutes of the second 15-minute per...
Emphysema is a type of chronic obstructive pulmonary disease (COPD). A person with emphysema has difficulties in breathing out. Why does emphysema...
Which factors contribute to outbreaks of measles after natural disasters? 1 contamination of drinking water with untreated sewage 2 lack of effect...
There are two main classes of antibiotics, broad spectrum and narrow spectrum. Broad spectrum antibiotics affect a wide range of bacteria, while n...
People with the autoimmune disease myasthenia gravis can have a treatment to relieve the symptoms. In this treatment, one of the components of thei...
Why are spleen cells fused with myeloma cells during monoclonal antibody production?
Fig. 1.1 is an image of a transverse section through the trachea of the gas exchange system. [Figure 1.1]
Starch molecules are the main storage molecules in many types of cereal grain, such as the grain of the barley plant.
T-helper lymphocytes and Leydig cells are two types of mammalian cells. The main role of T-helper lymphocytes and Leydig cells is to synthesise and...
Using a light microscope at a magnification of ×400, it is possible to identify different types of blood cell in prepared slides of mammalian blood.
Each meristem cell in a leaf bud is able to grow and divide by mitosis to produce two daughter cells that are genetically identical to each other a...
In March 2019, a tropical cyclone in the south-west Indian Ocean caused widespread flooding in a number of countries. The flooding and the damage c...
P1 is a slide of a stained transverse section through a plant stem.
The European eel, Anguilla anguilla, is a fish. The sizes of eel populations tend to remain relatively stable despite eels producing large numbers ...
The grey wolf, Canis lupus, is a large predator. During the 20th century, the grey wolf in south-west Europe was hunted almost to extinction.
Vitamin A deficiency is a widespread public health problem. One source of vitamin A is carotene in the diet. Carotene can be converted to vitamin A...
Red algae are multicellular photosynthetic protoctists that contain phycoerythrin. Phycoerythrin is a photosynthetic pigment.
Many processes and actions in plants and animals are due to the movement of ions. Table 5.1 lists several ions, the direction of movement of each i...