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BIO 112 test 2 study guide


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1. Which of the following traits do archaeans and bacteria share? 1. composition of the cell wall 2. presence of plasma membrane 3. lack of a nuclear envelope 4. identical rRNA sequences 2. Which two structures play direct roles in permitting bacteria to adhere to each other, or to other surfaces? 1 . capsules 2. endospores 3. fimbriae 4. plasmids 5. flagella 3. In a bacterium that possesses antibiotic resistance and the potential to persist through very adverse conditions, such as freezing, drying, or high temperatures, DNA should be located within, or be part of, which structures? 1 . nucleoid region 2. endospore 3. fimbriae 4. Plasmids 4. If a bacterium regenerates from an endospore that did not possess any of the plasmids that were contained in its original parent cell, the regenerated bacterium will probably also lack antibiotic-resistant genes 5. The following table depicts characteristics of five prokaryotic species (A-E). Use the information in the table to answer the following questions.
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How many of these species probably have a cell wall that partly consists of an outer membrane of lipopolysaccharide? 3species Gram-variable prokaryotes are, sometimes, those without any peptidoglycan. Which two species are most likely to be archaeans? species A and B Which species might be able to include Hfr cells? species D Which species should be able to respond most readily to taxes (plural of taxis)? Species C Species D is pathogenic if it gains access to the human intestine. Which other species, if it coinhabited a human intestine along with species D, is most likely to result in a recombinant species that is both pathogenic and resistant to some antibiotics? Species C Which species is most self-sustaining in terms of obtaining nutrition in environments containing little fixed nitrogen or carbon (not A) Which species is most likely to be found both in sewage treatment plants and in the guts of cattle? (not A) Which two species should have much more phospholipid, in the form of bilayers, in their cytoplasms than most other bacteria? (not A&B) 6. Which of the following is an important source of endotoxin in gram-negative species? Cell wall 7. Prokaryotic ribosomes differ from those present in eukaryotic cytosol. Because of this, which of the following is correct? Some antibiotics can block protein synthesis in bacteria without effects in the eukaryotic host. 8. Which statement about bacterial cell walls is false? Cell walls prevent cells from dying in hypertonic conditions.
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BIO 112 test 2 study guide - 1 Which of the following...

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