Bacteria have an enormous ability to adapt to new conditions. Which two of the following are they main factors behind this phenomenon? New mutations occur continuously with very high frequency in the genome of bacteria Bacteria generally have small genomes Bacteria have a short generation time The rate of DNA synthesis is very high in bacteria Presence of a selection pressure

Bacteria have an enormous ability to adapt to new conditions. Which two of the following are they main factors behind this phenomenon? New mutations occur continuously with very high frequency in the genome of bacteria Bacteria generally have small genomes Bacteria have a short generation time The rate of DNA synthesis is very high in bacteria Presence of a selection pressure

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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Antibiotic resistance is a real concern for the continued existence of humans. Bacteria exchange genes for antibiotic resistance through , leading to large populations of antibiotic individuals. Group of answer choices Vertical Gene Transfer Asexual Reproduction Horizontal Gene Transfer Transfugation
Certain strains of bacteria that were killed by the antibiotic penicillin in the past are now resistant. The probable explanation for this is that the reproductive rate must have increased naturally. a mutation for resistance occurred that was passed on to succeeding generations because it had high survival value. the strains have become resistant because they needed to do so for survival. individual bacteria gradually became tolerant to increasing levels of penicillin over some time.
Part A: Which of the following is not a reason that microbes benefit from horizontal gene transfer? cells can acquire useful traits quickly. all new types of DNA are good. genetic diversity is ehanced. All examples are reasons that microbes benefit. Part B:Transposable elements can do all of the following except move from one position to another in a chromosome. cause disruption in genes in which they insert. move from one cell to another. copy themselves, and the copy can insert somewhere else.
Which of the following statements correctly describes a process by which bacteria become resistant to antibiotics? A. bacteria reproduce slowly, allowing mutation to become widespread in a population. B. some bacteria produce exotoxins that breakdown antibiotics, rendering them nonfunctional C. conjugation spreads antibiotic resistance genes rapidly in a population D. antibiotics cause mutation in bacteria, making them resistant.
Mutations in DNA of an organism can be ___________________. harmful to the organism beneficial to the organism have no effect on the organism all of the above
Horizontal gene transfer is defined as bacteria can acquire genes from other bacteria. new genetic material is produced by sexual reproduction. bacteria can transfer new genes via meiosis. bacteria can transfer new genes via mitosis.
Antibiotics such as tetracycline, streptomycin, and bacitracin are small organic molecules that are synthesized by particular species of bacteria. Microbiologists have hypothesized that the reason why certain bacteria make antibiotics is to kill other species that occupy the same environment. Bacteria that produce an antibiotic may be able to kill competing species. Eliminating competitors provides more resources for the antibiotic-producing bacteria. In addition, bacteria that have the genes necessary for antibiotic biosynthesis contain genes that confer resistance to the same antibiotic. For example, tetracycline is made by the soil bacterium Streptomyces aureofaciens. Besides the genes that are needed to make tetracycline, S. aureofaciens also has genes that confer tetracycline resistance; otherwise, it would kill itself when it makes tetracycline. In recent years, however, many other species of bacteria that do not synthesize tetracycline have acquired the genes that confer…
What is the function of innate restriction enzymes in bacteria? • All of the answers are correct defense mechanism from phages • allow cells attach foreign DNA antibiotic resistance • cut up DNA strands
When you have a recombinant organism, it generally has genetic information from? only a bacteria only a genetically modified organism an organism that it is completely unrelated to only a yeast only an archaea
What is the difference between bacteria and viruses? Bacteria are non-living pieces of DNA or RNA; viruses are single-celled organisms Viruses are killed by antibiotics; bacteria are killed by probiotics Bacteria are harmful and are the cause of major human diseases; viruses are often helpful and can kill harmful bacteria Bacteria are single-celled organisms capable of survival and reproduction on their own; viruses cannot survive and replicate without a host cell
Frederick Griffith documented bacterial transformation. Which statement is true concerning his experiments? DNA that was not contained within a live cell caused the death of the host organism. DNA from dead Streptococcus cells entered live cells and altered the live cell's characteristics. The two strains of Streptococcus were visually indistinguishable. Heat treatment of the Streptococcus strains destroyed the DNA molecules.
New alleles in bacteria can arise by All of the answers are correct. conjugation transduction transformation mutation