Welcome to your Edexcel AS Biology 1 1. Select the incorrect sentence out of the following. The functions of DNA amd RNA are the same. DNA has a double helix structure. RNA is a short polynucleotide chain. The relative simplicity of DNA led many scientists to doubt that it carried the genetic code.2. The organic base not found in DNA. Thymine Adenine Uracil Cytosine3. Which of the following is not necessary for DNA replication? RNA Original DNA template Free DNA nucleotides DNA polymerase4. Select the incorrect statement with regard to ATP. ATP is adenosine triphosphate ATP is a complex organic chemical. It is formed from a molecule of ribose, 2 molecules of adenine and three phosphate groups. It is a nucleotide derivative.5. Select the incorrect statement about triglycerides. Triglycerides are fats and oils. Triglycerides are soluble in certain organic solvents. Triglycerides are soluble in water. They are the most common form of lipids.6. Select the incorrect statement about monosaccharides. Few monosaccharides possess a carbonyl group. They act as reducing sugars. They are soluble in water. They are sweet in taste.7. Which of the following is exposed upon unwinding the double helix structure of the DNA during DNA replication. Nitrogenous bases Cell wall Phosphate group Ribose sugar8. How many oxygen molecules at a time could be carried by a haemoglobin molecule? 4 1 2 39. The most common protein found in animals. Keratin Haemoglobin Albumin Collagen10. Which of the following is not a disaccharide? Glycogen Lactose Maltose Sucrose11. Which of the following statement is incorrect regarding RNA? The RNA nucleotides are joined to form a single strand. RNA is a type of nucleic acid called ribonucleic acid. The RNA nucleotides are joined by a bond between two successive phosphate groups. RNA has the base uracil.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 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 solvent14. Which of the following does not react with Benedict's solution? Glucose Sucrose Fructose Maltose15. A substance that speeds up a chemical reaction without being changed by the reaction. Catalyst Lipids Water Substrate16. Select the incorrect statement with regard to cell-surface membranes. All cells do not have cell-surface membranes. Some embedded proteins in the cell-surface membrane act as antigens. Some embedded proteins in the cell-surface membrane are involved in cell signalling–communication between cells. Cell-surface membranes contain embedded proteins.17. The most abundant organic molecule present on the earth. Hemicellulose Pectin Glucose Cellulose18. The final product of DNA replication. A wide variety of proteins Two DNA molecules, each of which contains a new and one old DNA strand. mRNA and tRNA DNA fragments19. Select the incorrect statement with regard to DNA replication. Cytosin pairs with guanine Adenine pairs with thymine Guanine pairs with adenine Thymine pairs with adenine20. Which of the following is a double membrane bound organelle? Lysosomes Chloroplast Ribosomes Peroxisomes21. Which indicates an indirect evidence for evolution? Presence of basic features in cells. Addition of extra features in cells. The fact that all cells arise from other cells. Existance of all life on Earth as cells.22. A major structural difference between an eukaryotic cell and a prokaryotic cell. Presence of smaller ribosomes in prokaryotic cells. Presence of one or more flagella in many prokaryotic cells. Presence of cell vacuole in eukaryotic cells. Presence of a nucleous in eukaryotic cells.23. Which property of water makes it bead up on waxy surfaces? Neutral pH Surface tension High specific heat capacity Adhesion24. 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.25. Who discovered the double helix structure of DNA? Watson and Crick Edison and Watson Crick and James Watson and JamesTime is Up!