Practice Exam 2 - 1. Monochromatic (single color) light is...

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1. Monochromatic (single color) light is sometimes used to increase the resolution of light microscopes. Light of which color below would give you the best resolution? A) Red B) Orange C) Green D) Blue 2. Pili are: A) small, hairlike projections around the cell. B) needed for conjugation. C) numerous and there can be over 1000 per cell. D) All of the above 3. The presence of D-amino acids in the crosslinks of the peptidoglycan layer is most likely because: A) most peptidases can only cleave L-amino acids. B) D-amino acids fit the structural constraints of the cell wall better than L-amino acids. C) the pool of L-amino acids needs to be preserved for protein synthesis. D) D-amino acids are easier to crosslink. 4. Which of the following is NOT true about bacterial flagella? A) Most of their length consists of a hollow, rigid protein tube. B) They are constructed largely of flagellin. C) They spin either clockwise or counter-clockwise. D) They are necessary for transformation of bacteria.
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5. Bacteria accomplish chemotaxis by: A) directional ‘steering’ toward attractants. B) tumbling less frequently and making longer runs when traveling towards an attractant. C) frequently stopping and tumbling to better sense attractants. D) stopping movement when conditions are good. 6. What is the purpose of bacterial endospores? A) To allow the bacterium to make hundreds of ‘seeds’. B) To help the bacterium to differentiate into faster growing stages of bacteria C) To allow the bacterium to survive the absence of oxygen D) To allow the bacterium to survive extended periods of heat or dryness 7. Unique components of the peptidoglycan layer are: A) D-amino acids. B) diaminopimelic acid. C) N-acetyl muramic acid. D) All of the above 8. Which of the following microscopes achieves the highest magnification and greatest resolution? A) Compound light microscope B) Phase-contrast microscope C) Darkfield microscope D) Fluorescence microscope E) Electron microscope
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9. This microscope takes advantage of differences in the refractive indexes of cell structures. A) Darkfield microscope
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Practice Exam 2 - 1. Monochromatic (single color) light is...

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