Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 3.3, Problem 3TQ
Summary Introduction
To review:
The selection of cells lacking S-layer for evolution during laboratory culture conditions.
Introduction:
Evolution is defined as the change in heritable characteristics in biological populations in successive generations. These characteristic changes may include gene expression that passes from one parental generation to the next progeny generation. The evolutionary changes are carried out by the natural selection method.
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Microbiology: An Evolving Science (Fourth Edition)
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- What would be the evolutionary advantage of having a period of natural “competence” in a bacterial life cycle? What would be possible disadvantages?arrow_forwardBacteria that live in the digestive systems of cows help break down the plants that cows eat, providing nutrients to cows. The digestive systems of cows offer a safe environment in which the bacteria can live and reproduce. Which type of realationship exist between the bacteria and the cows?arrow_forwardUnder the endosymbiotic theory for the origin of the eukaryotic cell. The ancestor of mitochondria and chloroplasts original became part of mutualism with a larger host cell. Which of the following best explains this mutualism? A) The mitochondria and chloroplasts provided specialized reproduction as part of the proto-germ line while the larger host cell provided energy for growth and reproduction. B) The mitochondria and chloroplasts provided gene products that could be used by the larger host cell for improved parasitization. C) The mitochondria and chloroplasts provided molecular energy in return for protection by the larger host cell. D) The mitochondria and chloroplasts produce toxins that the larger cell utilized to defend itself from other cells mutually increasing the defense of all those involved.arrow_forward
- You are tutoring a fellow student about the genomes of prokaryotes. You ask them to give you one important characteristic about the genomes of bacteria. Which of the following statement given by your student is correct? -Bacterial cells can contain DNA called plasmids. -The bacterial chromosome is not contained within a nucleus but, rather, is found at the nucleolus -Bacterial genomes are diploid throughout most of the cell cycle. -Bacterial genomes are composed of linear DNA. -Bacterial cells have multiple chromosomes, "packed" with a relatively large amount of protein.arrow_forwardAlexander Fleming was working with bacteria called staphylococcus, which looked like bunches of grapes under the microscope. He could grow colonies of these bacteria on petri dishes with a growth medium. When he returned from vacation, he found that several of these dishes had become contaminated with a fungus. The colonies near where the fungus was growing had been destroyed. Fleming then grew the mold and purposefully added it to a petri dish that contained bacteria colonies. The colonies exposed to the mold died. Fleming named the substance within the mold that killed bacteria "penicillin." REASONING: If mold contains a substance that kills bacteria, then ... a) bacteria exposed to mold would be destroyed b) bacteria could be grown on a growth medium c) fungus can be grown as easily as bacteriaarrow_forwardwhat evidence supports the claim that all cells share a common ancestor?arrow_forward
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