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.
The following are all processes that allow movement into cells. 1 phagocytosis 2 active transport 3 facilitated diffusion Which processes require...
Which features are required to allow for efficient diffusion? 1 a large surface area 2 a short diffusion pathway 3 maintenance of a constant diffu...
What is a role of mitosis?
Telomeres prevent the loss of genes from the ends of chromosomes during DNA replication, but they become shorter each time they are copied. In can...
The nucleus of a mouse body cell in G₁ phase of the cell cycle has 1.2 × 10⁻¹² g of DNA. What will be the mass of DNA in the nucleus of the cell a...
What occurs during prophase in animal cells? 1 fragmentation of the nuclear envelope 2 nucleolus disappears 3 stained chromosomes become visible 4...
Which statement describes the structure of ATP?
Rifampicin is an antibiotic used to treat tuberculosis. It works by inhibiting RNA polymerase in bacteria. Which processes are directly inhibited...
The table shows the DNA triplet codes for some amino acids. amino acid DNA triplet code amino acid DNA triplet code arginine GCA glycine CCA argin...
Some of the features present in transport tissues are listed. 1 lignified walls 2 cytoplasm 3 mitochondria 4 pits 5 plasmodesmata Which features ...
The diagrams show transverse sections through parts of plants. [Figure showing three transverse sections of plant parts labeled 1-6] Which row is ...
Which molecules form hydrogen bonds with water during transpiration? 1 cellulose in the xylem wall 2 suberin in the xylem wall 3 other water molec...
Some plant species can take up heavy metal contaminants that are dissolved in soil water and then transport them within the plant. Within plant cel...
What is the correct route for the movement of water from cell to cell in the apoplast pathway?
Which row shows the correct sequence for the movement of sucrose into phloem sieve tubes?
What occurs during ventricular systole in a mammalian heart? 1 Aortic pressure increases. 2 Atrial pressure does not change. 3 Ventricular pressur...
Which plan diagram represents the tissues in a major vein?
The diagram shows the pressure changes in various structures of the left side of the heart during the cardiac cycle. [Figure showing a graph of pre...
Which description of movement of substances during tissue fluid formation is correct?
Which row shows the change in concentration of some substances in red blood cells when carbon dioxide diffuses from active cells?
Which statements about the human gas exchange system are correct? 1 The absence of cartilage in small bronchioles allows them to expand. 2 The wal...
Four types of cell in the gas exchange system are listed. J alveolus epithelium cell K ciliated cell L goblet cell M smooth muscle cell The ticks...
Why is it difficult to control the spread of tuberculosis? 1 Global air travel for commerce and tourism has increased. 2 The bacterium that causes...
Rabies is a viral disease which can be spread to humans by a bite from an infected animal. One method of treatment is to inject the patient with a...
A student used a diagram to show four types of cells involved in the primary immune response. [Figure showing a diagram with cells types 1, 2, 3, 4...
Fig. 1.1 and Fig. 1.2 are photomicrographs showing the distribution of tissues in the lungs. Fig. 1.1 is a photomicrograph of a section through par...
B-lymphocytes are activated to form plasma cells during immune responses. Fig. 2.1 is a drawing of a plasma cell made from a transmission electron ...
A tyrosine kinase receptor (TKR) is a protein complex found in the cell surface membrane of mammalian cells. TKR has two components involved in the...
Adipocytes are cells found in adipose tissue in mammals. These cells absorb glycerol and fatty acids to make triglycerides for long-term storage. F...
Infectious diseases are caused by pathogens and are described as transmissible diseases.
Cotransporter proteins are membrane proteins found in companion cells of phloem tissue. Messenger RNA (mRNA) is the molecule in cells that carries ...
Epithelial cells in the small intestine have cell structures known as microvilli. The microvilli of these cells are found only on the surface that ...
Cholera is a life-threatening and infectious disease caused by the bacterium Vibrio cholerae. One of the symptoms of the disease is severe diarrhoe...
Hummingbirds are the smallest of birds and are found in the Americas. Some species migrate hundreds of kilometres between warmer overwintering area...
The enzyme carbonic anhydrase has been found in a wide range of organisms and acts as a catalyst in many tissues. Studies have shown that there are...
Fig. 5.1 is a photomicrograph of a transverse section through part of the bronchus of the human gas exchange system. The image is of a good resolut...
The transport tissues of plants are phloem and xylem. The role of xylem is the transport of water and mineral ions from the soil solution to the di...
The trachea of the gas exchange system branches into two airways, each of which enters a lung.
Bacterial cells are prokaryotic. The cells of plants are described as eukaryotic.
Hakea spp. are xerophytic plants native to Australia. The leaves of Hakea have adaptations for a xerophytic mode of life.
There are many different forms of Vibrio cholerae, a bacterium that is found naturally in aquatic environments. The bacterium is motile (can move) ...
Arachidonic acid is a fatty acid that is a common component of phospholipids. Phospholipids can be used as a source of arachidonic acid when it is...
The sinoatrial node, atrioventricular node and the Purkyne tissue have important roles in the cardiac cycle.
Plant extracts contain molecules which have many uses in industry and as medicines. It is important for scientists to be able to estimate the conce...
Plant tissues contain the enzyme catalase which catalyses the breakdown of hydrogen peroxide into oxygen gas and water. Ascorbic acid acts as an in...
K1 is a slide of a stained transverse section through a plant stem.
Plant cells contain an enzyme which catalyses the breakdown of hydrogen peroxide, releasing oxygen, as shown in Fig. 1.1. enzyme hydrogen peroxide ...
L1 is a slide of a stained transverse section through a plant leaf. Fig. 2.1 shows an image of some epidermal cells from the surface of a different...
(a) The golden mantella, Mantella aurantiaca, is a small terrestrial frog found in Madagascar. [Figure 1.1]
In eukaryotes, the cells of plants and photosynthetic protoctists contain chloroplasts.