DIFFERENCES BETWEEN PLASMID AND CHROMOSOMAL DNA IN BACTERIA. Eukaryotes have two or more chromosomes‚ prokaryotes such as bacteria possess a single chromosome composed of double-stranded DNA in a loop. DNA is located in the nucleoid of the cell and is not associated with protein A plasmid is an extra-chromosomal DNA molecule separate from the chromosomal DNA which is capable of replicating independently of the chromosomal DNA. Plasmids usually occur naturally in bacteria. A chromosome
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Laboratory Exercise #5 Identification of Fungi Fungi‚ like bacteria‚ may be useful in industry but also problematic. Many produce important products including foods‚ chemicals‚ enzymes and pharmaceuticals such as antibiotics and hormones. Molds‚ however‚ in particular‚ are also common contaminants in industry. It is important to be able to recognize and identify them‚ therefore‚ in the laboratory. In today’s laboratory session you will examine some common molds and attempt to identify them.
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Questions: A. What are the advantages of using bleach as a disinfectant? The disadvantages? The advantages of using 70% alcohol? The disadvantages? 70% alcohol mixtures are capable of killing most bacteria within five minutes. However‚ the mixture is ineffective against spores and has limited effect on viruses. Additionally‚ the 70%
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Cell Biology 1 – Prokaryotes & Viruses * Eukaryotes have a membrane whereas a prokaryote has no nuclear membranes. Both have a double stranded DNA. * The two main types of prokaryotes are bacteria and Archaea and eukarya are types of eukaryotes. * Archaea are more closely related to eukaryotes. * Prokaryotes have a membrane and nucleoid and most have a cell wall. * There are 3 main types of shapes of prokaryotes: * Bacillus – rod shapes * Spirilum – spiral shaped
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many bacteria that we encounter in our daily lives and it was informative to know that all bacteria is not bad. In fact‚ there needs to be a balance between the two and by educating yourself with the smallest amount of new information is very helpful. Humans rely on micro-organisms for a variety of things varying from health‚ welfare‚ food‚ and industrial products. Micro-organisms are microscopic organisms and can only be seen properly with the aid of a microscope. This includes viruses‚ microscopic
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Having the ability to collect and identify unknown microorganisms is vital in health and medicine. This capability is important for a variety of reasons‚ such as knowing the causative agent of disease‚ knowing if the microorganism obtains any beneficial properties and knowing the correct microorganism to use to create a successful antibiotic. Implementing the experimental methods learned thus far in the microbiology laboratory allowed an unknown bacterium to be identified as a result of this study
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THALLUS ORGANIZATION Unicellular Habit Motile form-with flagella Ex.Euglena Non-motile form-w/o flagella Ex.Gloeocapsa Colonial Habit Indeterminate- unlimited aggregates of cell division Determinate-aka Coenobium‚ division is at a fixed rate Filamentous Habit Simple unbranched –cells are capable of cell division‚ growth‚and reproduction Branched-cell division and growth are restricted to the end cells (Cladophora). Growth due to cell division of meristem is called Trichothallic
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tolerated within the unity of the species ○ Deciding what constitute a kingdom or in which domain a kingdom belongs § Taxonomists try to decide how to sort the diverse characteristics of living things into categories that reflect fundamental differences of
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1: The Microbial World and You Learning Objectives Go Over First Lecture 1-1 List several ways in which microbes affect our lives. 1-2 Recognize the system of scientific nomenclature that uses two names: a genus and a specific epithet. 1-3 Differentiate the major characteristics of each group of microorganisms. 1-4 List the three domains. 1-5 Explain the importance of observations made by Hooke and van Leeuwenhoek. 1-6 Compare spontaneous generation and biogenesis. 1-7 Identify
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Topic : The influence of computer viruses Nowadays ‚ most of our activities need computers .They are an excellent tool to help us solve quickly and effectively almost problems in our life. However‚ the computers are also very sensitive and may work wrongly if they are attacked by computer viruses . In fact ‚ the computer viruses may cause a lot of bad effects for users in which loosing data in computers‚ interupting business communication and stolen personal informations on the internet are
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