MCB 2610 Exam 1 Questions with 100% Correct Answers | Latest Update | Verified

Scientist __________ sealed his container of broth prior to boiling it to disprove the theory of spontaneous generation a. John Needham b. Lazzaro Spallanzani - Lazzaro Spallanzani Antony van Leeuwenhoek was inspired by _________________'s microscope work and refined it even more. a. Edward Jenner b. Louis Pasteur c. Robert Hooke d. Francesco Redi - Robert Hooke Bacteria are able to occupy more habitats than eukaryal cells because they a. Have greater metabolic diversity. b. Are smaller than eukaryal cells. c. Mutate more rapidly. d. Reproduce more quickly. - have greater metabolic diversity Bright-Field microscopes produce a light/dark image against a light/dark background - dark, light Due to its versatility, many scientists have hypothesized this molecule may have formed the basis for early life on earth. a. RNA b. Amino acids c. Lipids d. DNA - RNAFrancesco Redi worked to disprove what theory with his meat/fly jar experiments? - the theory of spontaneous generation How did Lister help decrease the number of hospital-acquired infections? a. By developing penicillin to treat infections b. By developing an antimicrobial agent to use in hospitals c. By showing that cleanliness had no effect on disease incidence d. By quarantining sick individuals - by developing an antimicrobial agent to use in hospitals How did Pasteur disprove spontaneous generation? a. By showing that bacteria would only grow when in direct contact with bacteria in the outside air b. By showing that bacteria would only grow when he added them directly to a flask c. By showing that diseases were caused by bacteria d. By isolating the infectious agent that caused disease - by showing that bacteria would only grow when in direct contact with bacteria in the outside air How did the atmospheric O2 concentration rise? a. Via plants b. Via cyanobacteria c. Via influx of O2 from respiration d. By using the energy of the sun - via cyanobacteria How do vaccines work? a. By exposing an individual to a weakened version of a microbe to cause a person to have immunity. b. By exposing an individual to a small piece of a microbe to cause a person to have immunity. c. Exposing an individual to an inactivated version of a microbe to cause a person to have immunity. d. All of the above - all of the aboveIn _________________ staining, cells are differentiated by the presence or absence of mycolic acid. a. Gram b. Acid-Fast - Acid-Fast In _________________ staining, cells are differentiated by the presence or absence of peptidoglycan. a. Gram b. Acid-Fast - Gram An important finding from Edward Jenner's vaccination experiment a. Vaccines are effective against all microorganisms. b. Immunity to one microorganism can be conferred by exposure to a closely related microorganism. c. Vaccines are effective only against viruses. d. All of these choices. - Immunity to one microorganism can be conferred by exposure to a closely related microorganism. In endosymbiotic theory, infested microbes that could fix carbon dioxide into organic molecules using light energy became ________________ a. mitochondria b. chloroplasts - chloroplasts In endosymbiotic theory, ingested microbes that could use oxygen for a respiratory process to produce chemical energy became __________________ a. mitochondria b. chloroplasts - mitochondria In the three domain system, microorganisms are categorized based on a comparison of ________ a. DNA b. lipids c. rRNA d. proteins - rRNA