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BIO 250 Final Exam Exam 2024 Questions and Answers.
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BIO 250 Final Exam Exam 2024 Questions and Answers.
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BIO 250 Final Exam Exam 2024Questions and Answers
A pure culture
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A) is sterile.
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B) is a population of identical cells.
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C) is made of a precisely defined chemical medium.
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D) contains one microbial cell. - answer-b
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Microbial cells first evolved on Earth approximately ________ _______ years ago.
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A) 1.6 to 1.8 million
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B) 7.0 to 7.2 million
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C) 3.8 to 3.9 billion
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D) 10.5 to 11.5 billion
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E) None of the above - answer-c
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Predict how Pasteur's conclusions on spontaneous generation with swan flasks
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would have changed if he worked with and maintained the flasks in a laminar flow
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hood (where the air is sterile).
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A) Sterilization of the swan flask solutions would not have been necessary to reject
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spontaneous generation. If he did sterilize the flasks, the spontaneous generation
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hypothesis would have been supported. n n n n
B) His incubation times would not have been sufficient to refute spontaneous
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generation.
C) Pasteur's flasks never would have putrefied, and the experiment would not have
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refuted spontaneous generation.
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D) Viruses would have still been present, and his conclusion would have been
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unchanged. - answer-c n n
,Of the structures listed below, which one is found in the outer most membrane of a
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Gram-negative cell? n
A) Ribosomes
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B) The peptidoglycan layer
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C) The periplasm
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D) LPS (lipopolysaccharide) layer - answer-d
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Gram-positive bacteria stain _____ with a Gram stain reaction because they have a
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__________ peptidoglycan layer than Gram-negative bacteria.
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A) red / thinner
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B) purple/ thinner
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C) purple / thicker
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D) red / thicker - answer-c
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Which of the following statement(s) is/are correct?
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A) Flagella allow bacteria to glide
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B) Flagella allow bacteria to swim
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C) The directed movement of bacterial cells in response to a gradient of a chemical,
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is called chemotaxis
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D) A and C are correct
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E) B and C are correct - answer-e
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Electron microscopy has _________ ________ than light microscopy, because the
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wavelengths of electrons are much ___________ than the wavelength of visible light.
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A) higher resolution/smaller
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B) lower magnification/larger
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C) higher resolution/larger
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D) lower resolution/smaller - answer-a
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Which of the following statements are false:
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A) Poly-β-alkanoates (PHA) such as poly-β-hydroxybutyrate (PHB) are carbon- and
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, energy-storing polymers that can be used to produce biodegradable plastics.
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B) A major function of prokaryotic gas vesicles is to confer buoyancy on cells by
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decreasing their density n n
C) A major function of the cytoplasmic membrane in prokaryotes is to act as a
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permeability barrier. n
D) Scanning electron microscopy can be used to visualize the different layers of the
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cell membrane(s) and cell wall - answer-d
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Beta-lactam antibiotics such as penicillin n n n n
A) interfere with chromosome replication
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B) prevent the transpeptidase from cross-linking two glycan chains in the
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peptidoglycan layer of a growing cell wall n n n n n n
C) prevent the cytoplasmic membrane from forming
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D) cannot penetrate the cell - answer-b
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From the standpoint of the microorganism, in glycolysis the useful product(s) are
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A) Anabolic intermediates
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B) ATP
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C) Fermentation products such as lactic acid and ethanol
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D) Both (A) and (B)
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E) (A), (B), and (C) - answer-d
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During respiration electrons from the __________ of substrates are used to ________
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a terminal electron acceptor that is either oxygen (aerobic respiration) or some other
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inorganic compound (anaerobic respiration)
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A) reduction / oxidize
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B) transport / degrade
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C) oxidation / reduce
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D) none of the above - answer-c
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Which intermediate compound(s) in the citric acid cycle is/are often used for
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