Microbiology Chapter 2 Test Bank

Which of the following statements is not true about the atom? A) It has 6 protons in its nucleus. B) It has 12 neutrons in its nucleus. C) It has 6 electrons orbiting the nucleus. D) Its atomic number is 6. E) Its atomic weight is 12. - B) It has 12 neutrons in its nucleus 2 C 6 16 O 8 12 C 6 1 H 1 Calculate the molecular weight of ethyl alcohol, C 2H5OH, using the information in Table 2.1. A) 96 B) 46 C) 34 D) 33 E) Can’t tell - B) 46 Which of the following is not true about enzymes? A) Enzymes are made of proteins. B) Enzymes lower the activation energy of a reaction. C) Enzymes increase the number of collisions in a chemical reaction. D) Enzymes are not used up in a reaction. E) None of the above. - C) Enzymes increase the number of collisions in a chemical reaction Which of the following is not true? A) Salts readily dissolve in water. B) Water molecules are formed by hydrolysis. C) Water freezes from the top down. D) Water is a part of a dehydration reaction. E) Water is a polar molecule. - B) Water molecules are formed by hydrolysis Which of the following is the type of bond holding K+ and I- ions in KI? A) Ionic bond B) Covalent bond C) Hydrogen bond - A) Ionic bond Which of the following is the type of bond between molecules of water in a beaker of water? A) Ionic bond B) Covalent bond C) Hydrogen bond - C) Hydrogen bond What are the type of bonds holding hydrogen and oxygen atoms in the molecule of H 2O? A) Ionic bond B) Covalent bond C) Hydrogen bond - B) Covalent bond Identify the following reaction: Glucose + fructose → sucrose + water A) Dehydration synthesis reaction B) Hydrolysis reaction C) Exchange reaction D) Reversible reaction E) Ionic reaction - A) Dehydration synthesis reaction Identify the following reaction: Lactose + H2O → glucose + galactose A) Dehydration synthesis reaction B) Hydrolysis reaction C) Exchange reaction D) Reversible reaction E) Ionic reaction - B) Hydrolysis reaction Identify the following reaction: HCl + NaHCO3 → NaCl + H2CO3 A) Dehydration synthesis reaction B) Hydrolysis reaction C) Exchange reaction D) Reversible reaction E) Ionic reaction - C) Exchange reaction