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TRBC Bio M2OYO

Module 2 On Your Owns

QuestionAnswer
OYO 2.1 Two different species of bacteria attempt to infect an organism. One bacterium succeeds, while the other is destroyed by the organism's infection-fighting mechanisms. What is most likely the major differences between these two bacteria? The bacterium that succeeded most likely has a capsule while the other does not. In bacteria, the capsule helps to protect the organism from infection-fighting mechanisms.
OYO 2.2 A bacterium is poisoned by a substance that is allowed into the interior of the cell. What bacterial component did not do its job? The plasma membrane did not do its job. Since it regulates what moves in and out of the cell, it should not have allowed the toxin to enter.
OYO 2.3 If a bacterium cannot move, what structure is it missing? It is missing the flagellum. The fimbriae are not for movement; thus, if a bacterium has no flagellum, it cannot move.
OYO 2.4 Can a saprophytic bacteria be autotrophic? No. Saprophytic means that it feeds on dead matter. Autotrophic organisms make their own food.
OYO 2.5 Can an aerobic bacterium be chemosynthetic Yes. Aerobic and anaerobic deal with how the organism converts its food into useful energy.
OYO 2.6 A population of bacteria grown from a single "starter" bacteriumim is rather fragile. When conditions are changed, the population dies quickly. Based on what you have just learned, develop a hypothesis for why this is the case. Since asexual reproduction allows no variation in the DNA,an entire population of bacteria started from a single bacterium have all the same traits.
OYO 2.7 A population of bacteria reaches a steady state and then, after several days, the population actually increases dramatically. What could cause such an event? More resources (most likely food) were added to the habitat. The only way you can get population growth after the steady state would be due to an influx of new resources. In our cow example, maybe another cow died adn fell on top of the first cow's body!
OYO 2.8 See your book. This one is too long. See your book.
OYO 2.9 A bacterial colony is called staphyloacillus. What shape do the bacteria in the colony possess: spherical, rod-shaped,or helical? They are rod-shaped since "bacillus" means rod-shaped.
OYO 2.10 A bacterium has no cell wall. To what phylum does it belong? Tenericutes is the phylum for bacteria without a cell wall.
OYO 2.11 A bacteriumis classified as Gram-positive. To what phylum does it belong? Firmicutes contains all Gram-positive bacteria
OYO 2.12 A bacterium appears red after a Gram stain. To what phylum does it belong? Gracilicutes contains all Gram-negative bacteria. Since the bacterium appears red after the Gram stain, it is Gram-negative.
OYO 2.13 A bacterium has a cell wall that is different from both Gram-positiveadn Gram-negative bacteria. To what phylum does it belong? Mendosicutes contains all bacteria with exotic cell walls.
OYO 2.14. Construct a biologicalkey that separates bacteria into their different classes. You can assume that the only organisms the key will be used to analyze are bacteria (HINT: the first question should determine if the bacterium has cell wall.) To make a biological key, we ask a series of questions that separate bacteria according to their traits.
Created by: sdushaw
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