Welcome to your Edexcel AS Biology 1 1. Which of the following is a double membrane bound organelle? Chloroplast Ribosomes Lysosomes Peroxisomes2. Which property of water provides a cooling effect with little loss of water through evaporation? Relatively large latent heat of vaporisation Strong cohesive forces between molecules High heat capacity Being a solvent3. A major structural difference between an eukaryotic cell and a prokaryotic cell. Presence of one or more flagella in many prokaryotic cells. Presence of a nucleous in eukaryotic cells. Presence of cell vacuole in eukaryotic cells. Presence of smaller ribosomes in prokaryotic cells.4. The most common protein found in animals. Collagen Albumin Keratin Haemoglobin5. A substance that speeds up a chemical reaction without being changed by the reaction. Catalyst Substrate Water Lipids6. Which indicates an indirect evidence for evolution? Presence of basic features in cells. Existance of all life on Earth as cells. Addition of extra features in cells. The fact that all cells arise from other cells.7. Which of the following is exposed upon unwinding the double helix structure of the DNA during DNA replication. Nitrogenous bases Phosphate group Cell wall Ribose sugar8. Which of the following is not necessary for DNA replication? RNA Original DNA template Free DNA nucleotides DNA polymerase9. Select the incorrect sentence out of the following. DNA has a double helix structure. The relative simplicity of DNA led many scientists to doubt that it carried the genetic code. The functions of DNA amd RNA are the same. RNA is a short polynucleotide chain.10. The organic base not found in DNA. Cytosine Adenine Thymine Uracil11. Which of the following statement is incorrect regarding RNA? The RNA nucleotides are joined to form a single strand. RNA has the base uracil. RNA is a type of nucleic acid called ribonucleic acid. The RNA nucleotides are joined by a bond between two successive phosphate groups.12. The enzyme responsible for unwinding the double helix structure of the DNA during DNA replication. Amylase DNA helicase DNA ligase DNA polymerase13. Which property of water makes it bead up on waxy surfaces? Neutral pH Surface tension High specific heat capacity Adhesion14. Which of the following does not react with Benedict's solution? Sucrose Glucose Fructose Maltose15. How many oxygen molecules at a time could be carried by a haemoglobin molecule? 4 2 1 316. Select the incorrect statement about monosaccharides. They are soluble in water. They act as reducing sugars. They are sweet in taste. Few monosaccharides possess a carbonyl group.17. Select the incorrect sentence out of the following. DNA is a long nucleotide chain. The common organic bases in RNA are adenine, guanine, cytosin and uracil. The pentose sugar in DNA is deoxyribose whereas in RNA it is ribose.18. Who discovered the double helix structure of DNA? Watson and James Crick and James Edison and Watson Watson and Crick19. Select the incorrect statement about triglycerides. They are the most common form of lipids. Triglycerides are soluble in certain organic solvents. Triglycerides are fats and oils. Triglycerides are soluble in water.20. Which of the following is not a disaccharide? Glycogen Lactose Sucrose Maltose21. The most abundant organic molecule present on the earth. Cellulose Hemicellulose Glucose Pectin22. Select the incorrect statement with regard to DNA replication. Thymine pairs with adenine Adenine pairs with thymine Guanine pairs with adenine Cytosin pairs with guanine23. The final product of DNA replication. DNA fragments Two DNA molecules, each of which contains a new and one old DNA strand. mRNA and tRNA A wide variety of proteins24. Select the incorrect statement with regard to ATP. ATP is a complex organic chemical. ATP is adenosine triphosphate It is a nucleotide derivative. It is formed from a molecule of ribose, 2 molecules of adenine and three phosphate groups.25. Select the incorrect statement with regard to cell-surface membranes. Cell-surface membranes contain embedded proteins. All cells do not have cell-surface membranes. Some embedded proteins in the cell-surface membrane are involved in cell signalling–communication between cells. Some embedded proteins in the cell-surface membrane act as antigens.