polymerase joins nucleotides in one direction only. B) The leading strand of DNA is made continuously. C) The lagging strand of DNA is started by an RNA primer. D) DNA replication proceeds in one direction around the bacterial chromosome. E) Multiple replication forks are possible on a bacterial chromosome. Answer: D Skill: Understanding 4) DNA is constructed of A) a single strand of nucleotides with internal hydrogen bonding. B) two complementary strands of nucleotides bonded A—C and G—T. C)
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are thin rods anchored to the outer membrane of bacteria with an adhesin at the tip. This adhesin is what gives the bacteria their binding specificity. Pili can serve a variety of roles such as‚ adhesion or the transfer of material during bacterial conjugation. Fimbria are a type of pili that are solely for attachment to host cells. Pili were thought to only be present in gram negative bacteria but research shows they occur in gram positive bacteria as well. It has also been shown that some pili
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Lab Report #1: Observing Bacteria Microbiology Abstract: This lab exercise familiarized the student with the use of a microscope by observing and identifying various different slides under the microscope. The student practiced observing the given slides under the 10x‚ 40x‚ and 100x (oil immersion) objective lenses‚ which allowed for the identification of the different organism’s shapes and sizes. Purpose: The aim of this exercise is to equip the student with the knowledge
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The first is referred to as bacterial transformation and is caused by the alteration of a cell‚ which results in the uptake and expression of foreign DNA. Transduction is the process by which DNA from one bacterium is transferred to another bacterium through a virus‚ which infects one taking genetic information and then the other‚ depositing the genetic information. The final way HGT occurs is though a process known as conjugation. Conjugation is a form of bacterial “mating” which results in the
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one of the most resistant genes found in gram negative bacteria. If this genes is readily passed between different types of bacteria‚ widespread resistant bacteria could emerge. NMD-1 can spread between bacteria via conjugation (bacterial sex)‚ the gene for NMD-1 is present on bacterial DNA (plasmids); these plasmids are outside the chromosome. Treating patient with board spectrum
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Chapter 17 Louis Pasteur’s experiment illustrated that: microbes will not grow in a nutrient broth that has been sterilized unless air is allowed to enter the vessel through an opening. Living organisms can spontaneously generate from nonliving matter. True or False? False The scientists usually given credit for disproving the theory of spontaneous generation of bacteria are: Tyndall & Pasteur Miller and Urey’s experiments attempting to recreate the prebiotic environment produced a rich mixture
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Chapter 25 Pre-Test Question 1 Part A Miller and Urey’s experiments that attempted to recreate conditions on early Earth were significant because _____. Hint 1. They gave credence to the idea of abiotic synthesis. ANSWER: they showed how polymers could form spontaneously on a clay substrate they produced the first protocells they showed how radiometric dating could be used to give the absolute ages of rocks and fossils proved the endosymbiotic theory they showed that organic
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among species DIRECTIONS Read the article “Battle of the Bugs: Fighting Antibiotic Resistance” and answer the following questions. 1. According to CDC estimates‚ how many hospital patients die each year of bacterial infections obtained while in a hospital? 90‚000 2. What percentage of bacterial strains are resistant to at least one of the antibiotics commonly used to treat infections? More than 70% 3. When did microbes begin appearing that were resistant to penicillin? In the late 1940’s 4. What
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consists of a large domain of prokaryotic microorganism in which can fight of antibiotics allowing the bacteria to become antibiotic resistant. In this lab report‚ we discover the most effective disinfectant that would work best in killing the harmful bacterial strain‚ Bacillus subtilis. KB testing or disc diffusion antibiotic sensitivity testing is measured through the diameter in millimeters to find how resistant the antibiotic to the bacteria. The hypothesis of Windex fell correctly with my results but
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Chapter 1 1. The scientist usually considered the first to see microorganisms‚ which he called "animalcules"‚ was A) Redi B) van Leeuwenhoek C) Pasteur D) Tyndall 2. The idea of Spontaneous Generation postulated that A) organisms could evolve into the next generation of organisms B) organisms could spontaneously combust C) organisms could spontaneously arise from other living organisms D) living organisms could spontaneously arise from non-living material 3. The work of Tyndall
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