Brock Biology of Microorganisms Chapter 3 Exam Questions With Correct Answers

Brock Biology of Microorganisms Chapter 3 Exam Questions With Correct Answers The sum of all biosynthetic reactions in a cell is known as A) metabolism. B) anabolism. C) catabolism. D) synthatabolism. - answerB) anabolism Based on the functional roles of phosphate in various microbial metabolisms, deduce which compounds phosphate exists as in microorganisms. A) organic compounds B) inorganic compounds C) both organic and inorganic compounds D) neither organic nor inorganic compounds - answerC) both organic and inorganic compounds Which of the following would be used by a chemoorganotroph for energy? A) C2H3O2- B) H2 C) CO2 D) H+ - answerA) C2H3O2- Which of the following statements is FALSE? A) Most bacteria are capable of using ammonia as their sole nitrogen source. B) Some bacteria are able to use nitrates or nitrogen gas as their nitrogen source. ©SIRJOEL EXAM SOLUTIONS 10/3/2024 9:54 PM C) Most available nitrogen is in organic forms. D) Nitrogen is a major component of proteins and nucleic acids. - answerC) Most available nitrogen is in organic forms. All microorganisms require A) carbon, iron, and sodium. B) phosphorus, aluminum, and sodium. C) calcium, potassium, and magnesium. D) phosphorus, selenium, and sulfur. - answerD) phosphorus, selenium, and sulfur. Which element functions BOTH as an enzyme cofactor and as a stabilizer of ribosomes and nucleic acids? A) iron B) hydrogen C) zinc D) magnesium - answerD) magnesium Based on your understanding of metabolism, generalize when an enzyme's rate of activity can be changed. A) before enzyme production B) during enzyme production C) after enzyme production D) at any point-before, during, or after enzyme production - answerC) after enzyme production The change in Gibbs free energy for a particular reaction is MOST useful in determining A) the amount of energy catalysts required for biosynthesis or catabolism. B) the potential metabolic reaction rate. C) whether there will be a requirement or production of energy. D) energy stored in each compound. - answerC) whether there will be a requirement or production of energy. Which is an example of a micronutrient? ©SIRJOEL EXAM SOLUTIONS 10/3/2024 9:54 PM A) arginine B) inorganic phosphorous C) iron D) vitamin B12 - answerC) iron Aseptic technique refers to A) the microbial inoculum placed into a test tube or onto a Petri plate. B) a series of practices to avoid contamination. C) the autoclave and other sterilizing procedures. D) cleanliness in the laboratory. - answerB) a series of practices to avoid contamination. To ensure growth of a newly discovered bacterium with unknown nutritional requirements, it would be best to begin with a ________ medium rather than a ________ medium. A) complex / minimal B) minimal / complex C) selective / complex D) selective / differential - answerA) complex / minimal If ΔG0' is negative, the reaction is A) exergonic and requires the input of energy. B) endergonic and requires the input of energy. C) exergonic and energy will be released. D) endergonic and energy will be released. - answerC) exergonic and energy will be released. Activation energy is the energy A) required to transform all reactants into their reactive state. B) given off as the products in a chemical reaction are formed. C) absorbed as ΔG0' moves from negative to positive. D) needed by an enzyme to catalyze a reaction without coenzymes. - answerA) required to transform all reactants into their reactive state.