Welcome to your Edexcel B AS Biology 1 1. A condensation reaction between two nucleotides forms the following bond. Ionic bond Sulphide bond Glycosidic bond Phosphodiester bond2. The site of DNA replication. Nucleous Golgi bodies Cytoplasm Ribosome3. 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 Being a solvent High heat capacity4. Choose the correct statement regarding DNA replication. This process occurs at the end of every cell division. When the cell divides, each daughter cell will inherit different copies of DNA. Free DNA nucleotidesare essential for DNA replication. This is a process by which a cell does not make an identical copy of its DNA.5. The type of bond broken by the enzyme DNA helicase during DNA replication. Hydrogen bonds Disulphide bonds Phosphodiester bonds Ionic bonds6. What are the components of a nucleotide? Pentose, phosphate group, Nitrogen containing organic base Pentose, phosphate group, amine group Pentose, amine group, Nitrogen containing organic group Phosphate group, Nitrogen containing organic base, carboxyl group7. A condensation reaction between two amino acids forms the following bond. Glycosidic bond Peptide bond Ionic bond Ester bond8. Choose the incorrect statement regarding DNA replication. It begins with the unwinding of the double helix. No enzymes are involved in the process. It involves a series of processes. It is an energy consuming process.9. Select the incorrect statement with regard to water. It is an important solvent. It has several properties that are important in biology. It has a relatively low heat capacity. Water is a major component of cells. 10. Which of the following is exposed upon unwinding the double helix structure of the DNA during DNA replication. Phosphate group Ribose sugar Nitrogenous bases Cell wall11. Which of the following is responsible for transfering genetic information from DNA? ER Plasmids RNA Ribosomes12. Which of the following is a polymer of nucleotides? Glucose Proteins Lipids RNA13. Which of the following solutions turn milky white upon adding ethanol and water? a) A slice of potato b) Milk c) Palm oil d) A piece of apple None b & c only a & b only a, b & c14. The enzyme responsible for forming hydrogen bonds during the process of DNA replication. DNA polymerase DNA helicase DNA ligase Lactase15. What happens when a Biuret reagent is added to a solution of free amino acids? The solution turns brick red. The solution remains blue. The solution turns mauve/purple. The solution turns milky white.