Micno 3003 Ray midlterm exam I version A name March 1, 201S 38 Enymes speed up r

Question

Micno 3003 Ray midlterm exam I version A name March 1, 201S 38 Enymes speed up reactions by A. raising activation energy heat.D B. C reducing entropy. D. lowering activation energy. E. raising activation energy AND reducing entropy 39. The term "precursor metabolite" refers to molecules that A. activate cell components. B are used in biosynthesis, C. result from cell activities.3 D. are present but inactive. 40. The transition step A. links glycolysis to the pentose phosphate pathway. B. links the pentose phosphate pathway to the Entner-Duodoroff pathway. C. links glycolysis to the TCA cycle. D. takes place in the matrix of the nucleus. 1. Lactic acid bacteria such as StreptococCs A. produce catalase. B. are obligate fermenters. C. require anacrobic environments. D. use oxygen as a final electron acceptor Fill in the blank 42. During which phase of the bacterial growth curve is generation time measured? 43. What is the terminal electron acceptor in aerobic respiration and what is it reduced to? 44. What is the carbon source for autotrophic organisms? 45. Organisms that use inorganic chemicals (such as H S or NHs) as an energy source, and CO2 as a carbon source are called 6. Gram

Explanation / Answer

38. D. Lowering activation energy

39. B. Used in biosynthesis. used to synthesize macromolecular subunits such as amino acids, lipids, and nucleotides.

40. C. Links glycolysis to the TCA cycle

41. C. Require anaerobic environments

42. Log phase

43. O2 and reduced to H2O

44. CO2

45. Chemoautotrophs

46. Gram -ve

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