A mutation that confers drug resistance is present in a bacterial population that has never been treated with antibiotics. The mutation is present in this population because: O mutations arise randomly bacteria reproduce asexually it is an advantageous phenotype all mutations that ever arise are retained within populations

A mutation that confers drug resistance is present in a bacterial population that has never been treated with antibiotics. The mutation is present in this population because: O mutations arise randomly bacteria reproduce asexually it is an advantageous phenotype all mutations that ever arise are retained within populations

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter20: Phylogenies And The History Of Life

Section: Chapter Questions

Problem 13RQ: Particles that transfer genetic material from one species to another, especially in marine...

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You are helping a patient who you think has CJD. They want you to explain how this happened. Which explanation below is NOT correct? O spontaneous misfolding of the normal prion with age O possible transfer of abnormal prions on contaminated surgical instruments O overuse of antibiotics O possible transfer of abnormal prions from blood transfusion O possible transfer of prions through organ transplant O consumption of beef from cattle with BSE Question 65 Below are stens in the evolution/emergenco of vCD
An endosymbiont is any organism that lives within the body or cells of another organism. Each would have performed mutually benefiting functions from their symbirie relationship. Why are the mitochondria considered an endosybiont in an eukaryotic cell ? They have two membranes have DNA sequences that indicate origin from the alpha- prroteobacteria has a means for using oxygen and create ATP can break down glucose for energy O They contain hydrolytic enzymes
New alleles in bacteria can arise by All of the answers are correct. conjugation transduction transformation mutation
Select only the true statements about soil bacteriophages ahead: -Phages help on increasing soil biodiversity -Phages are nnonself replicating living infectious agents -Phages prevents low-generation-time- species from becoming dominant - Phages can infect protozoa -Phages are important in bacteria lateral gene transfer
Which of the following is NOT a reason for the high levels of bacterial genetic diversity? mutation rapid reproduction genetic recombnation vertical gene transfer
Fill-in the blanks in the figure below: conjugation genetic variation antibiotic resistance DNA replication binary fission genetic recombination antibiotics mutations (9) may be acquired from other cells through combines DNA from different cells, resulting in Serious bacterial infections are treated with may not kill bacteria with genes for may result from contribute to contributes to is passed from parent to offspring through are mistakes that usually occur during kill sensitive bacteria or interfere with occurs during propagates through a growing bacterial population via
There are concerns about overuse and misuse of antibacterial drugs, and the association of these with increased antibiotic resisstance in bacteria. Of the following, which best explains this? Antibiotic exposure directly causes many of bacterial in a population to mutate and develop new antibiotic resistance traits. If antibiotic use occurs repeatedly in a person, the dosage of the drug needs to be increased to work in a patient’s system because he/she will develop physiological tolerance to the antibiotic. Exposure to an antibiotic causes bacteria to die or become stronger; stronger bacteria will be better able to cope with additional exposures to any antibiotic drug, eventually becoming immune to all antibiotics. Antibiotics kill susceptible cells and even a small number of existing resistant bacteria that survive will become the majority of the population that remains, leading to populations that are resistant to this drug.
All of these are example of the horizontal gene transfer EXCEPT: transduction transferring genes via a bacteriophage transformation transmutation conjugation
An infectious disease research group is studying a microbe that can cause infections and gastrointestinal disease in humans, and which can also survive and reproduce in hamsters. A dormant cyst form of the microbe infects human hosts through fecal-oral transmission if they come in contact with hamster droppings and don’t wash their hands before eating. The organism exhibits active, motile morphological forms at other stages of its life cycle. Sexual reproduction (fusion of haploid gametes) occurs in the hamsters; only asexual reproduction occurs in humans. It has a nucleus, but does NOT have a cell wall. This microbe could be which of the following? Protozoan Fungus Bacterium Virus
Why is it so hard to get rid of the following organism? They undergo bottlenecking in their populations when taking antibiotics? They gain plasmids that help them build resistance. Using antibiotics are ineffective. They come from mosquitos and they are abundant. Part of their life cycle includes zoonosis with snails.
Which of the following options best describes the process of selection for antibiotic-resistant bacteria in the presence of an antibiotic? Antibiotic resistance occurs when the human body resists an antibiotic; the bacteria are not under selective pressure Antibiotic-resistant cells are naturally stronger, so they always take over in the presence of antibiotic- sensitive cells Antibiotics kill off sensitive cells, while resistant bacteria survive and multiply O In the presence of antibiotics, most bacterial cells react by becoming resistant before they start dividing again MacBook Air DD 000 80 F9 000 F8 F7 F5 F6 F3 F4
Which of the following is a bacterial genetic recombination mechanism that happens with the aid of bacteriophages. * O meiosis conjugation transduction binary fission O transformation tomperate phages*