An example‚ is bacterial exoenzymes called beta-lactamases that hydrolyze the beta-lactam ring of some penicillins and cephalosporins. The drugs are now inactive and the enzymes that do this are called penicillinase and cephalosporinase. Staph aureus produces penicillinase
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be helpful‚ but can be extremely harmful as well. The harmful bacteria have acted as parasites towards humans since the initiation of mankind. Campylobacter Jejuni‚ ranked as a subspecies of the Campylobacter species‚‚ is the most common form of bacterial gastroenteritis in third-world countries. In fact‚ it causes 5-14% of diarrhea-related diseases worldwide‚ resulting in hospitalization. For instance‚ in the United States‚ a survey has proven that approximately 17% of food-borne diseases are as
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material in one eukaryotic cell is copied and distributed to two identical daughter cells. B) A gene in a eukaryotic cell is transcribed and translated to produce a protein. C) The genetic material from one bacterial cell enters another via transformation‚ transduction or conjugation. 16 total pts possible A) max 8 pts combined (4 pts max each part – Part a is looking for “copy and distribute”) “copy”= DNA replication -when DNA is copied- interphase‚ S phase of cell cycle
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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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Comparative Study of Ipil-Ipil (Laucaenaglauca) and Kakawate Leaves (Gliricidiasepium) as Regulator in the Angiogenesis of the Chicken Embryo A Research Paper Presented to Cebu City National Science High School Salvador St.‚ Labangon Cebu City In Partial Fulfillment Of the Requirements for Research I Subject Proponents: Labus‚ Niña Marie A. Legaspi‚ Yvan S. Sullivan‚ Paula Denise Margaret V. III-Xenon TABLE OF CONTENTS Title page...................................
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Learning Objectives: What is evolution and phylogeny? Evolution and microbial phylogeny How do we measure or analyse it? What are the underlying mechanisms? How did it all start? Torsten Thomas t.thomas@unsw.edu.au Learning Objectives: What is evolution and phylogeny? How do we measure or analyse it? What are the underlying mechanisms? How did it all start? Evolution & Phylogeny Evolution: the process by which organisms become distinct from their ancestors. Phylogeny: the
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BIOL1102 2008 PRACTICE QUESTIONS FOR THE MID-TERM EXAM Practice Questions from week 2 lectures 1. The presence of cholesterol in the plasma membrane of some animals: a) Enables the membrane to stay fluid more easily when cell temperature drops b) Enables the animal to remove hydrogen atoms from saturated phospholipids c) Enables the animal to add hydrogen atoms to unsaturated phospholipids d) Makes the membrane less flexible‚ allowing it to sustain greater
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1. The classification system developed by Linnaeus in the early 1700s divided living organisms into plant and animal kingdoms. Today‚ that has been expanded into five kingdoms. Which of the following inventions was most responsible for creating the need for the additional three kingdoms and why? (2 points) (0 pts) Fossil fuel-based transportation made it easier to explore and discover new species. (0 pts) Genetic engineering created new species which then needed new kingdoms. (2 pts) Microscopes
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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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Chapter 27. BACTERIA & ARCHEA Overview: Prokaryotes thrive almost everywhere‚ including places too acidic‚ salty‚ cold‚ or hot for most other organisms Masters of Adaptation Most prokaryotes are microscopic‚ but what they lack in size they make up for in numbers There are more in a handful of fertile soil than the number of people who have ever lived They have an astonishing genetic diversity Prokaryotes are divided into two domains: bacteria and archaea Structural‚ functional‚ and genetic
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