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Study Guide Answers

1.     Into what two kingdoms are bacteria divided?
     Archaebacteria and Eubacteria
2.     Of the two kingdoms listed in #1, which consists of bacteria that thrive in extreme conditions?
     Archaebacteria
3.     Of the two kingdoms listed in #1, which consists of bacteria that cause disease in humans and in animals?
     Eubacteria
4.     _________________ cannot make their own food.
     Heterotrophs
5.     What are saprobes?
     heterotrophic bacteria that feed on dead organisms or organic wastes
6.     _________________ have the ability to make their own food.
     Autotrophs
7.     ______________ are bacteria that require oxygen to live.
     Aerobes
8.     List both the Latin and common names for the three shapes in which bacteria most commonly occur.
     coccus, or spherical; spirillum, or spiral-shaped; bacillus, or rod-shaped
9.     Into what formations may bacteria arrange themselves?
     pairs, clusters, or chains
10.     What extensions help the bacterium to drive itself through its environment?
     flagella
11.     What structure does a bacterium have instead of a nucleus?
     a nucleoid
12.     Describe what occurs during the process of binary fission.
     A bacterium copies its own DNA, which attaches to the cell's plasma membrane. The cell grows and divides to form two cells, and each has the same chromosomal information.
13.     What is another means by which bacteria reproduce (besides binary fission)?
     conjugation
14.     A ______________ is a disease-causing agent that damages the tissues of its host.
     pathogen
15.     What life-saving drug did Alexander Fleming discover in 1928?
     penicillin
16.     Which has a thicker cell wall, a Gram-negative or a Gram-positive bacterium?
     Gram-positive
17.     List three benefits provided by bacteria.
     manufacturing of food, production of life-saving drugs, make essential elements available to plants, create household cleaning solutions
© Educational Video Network, Inc. 2005 - www.evndirect.com
Your leading source for curriculum-based educational videos and DVDs.