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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Bacterial Smears Are Fixed before Staining to? Answer It is important to heat fix the bacterial smear before staining so as to‚ kill the bacteria‚ firmly adhere the smear on to the microscopic slide to prevent washing off during staining‚ and to allow the sample to readily take up the stain. Reference: www2.hendrix.edu What is the purpose of heat- fixing the smear? It helps the cells adhere to the slide so that they can be stained. The purpose of heat fixing is to kill the organisms without
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Spread of Infection 1. Identify the differences between bacteria‚ viruses‚ fungi and parasites. Bacteria is something that we need some of‚ it needs a warmth‚ moisture‚ time and food in order to multiply‚ which in the right conditions they multiply quickly. Viruses need a living host in order to survive‚ they don’t respond to antibiotics and new strains of virus are developing all the time. Fungi are moulds and yeasts‚ they need a warm and damp environment to survive‚ much like bacteria. Parasites
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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. While the identification
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· Taxonomy ○ Science of classification ○ Provides an orderly basis for the naming of organisms and for placing organisms into a category (taxon) ○ Makes use of and makes sense of the fundamental concepts of unity and diversity among living things ○ Basic principle is that members of higher-levels groups share fewer characteristics than those in lower-level groups * Escherichia coli - rod shape and have a Gram-negative cell wall * Even members of the same species display variations
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Foodborne Illnesses Worksheet Eating unhealthy food is one thing. Eating food that has been contaminated with a pathogen‚ toxin‚ or other harmful substance is quite another. You may be surprised to know that more than 200 diseases are transmitted through food. Becoming knowledgeable about how food becomes contaminated and how it affects the human body may greatly increase your ability to improve your health and wellness while staying free from foodborne illnesses. With this worksheet‚ first choose
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IC02 Causes and spread of infection The difference between bacteria‚ viruses‚ fungi and parasites are: Viruses are coated genetic material that invade cells and use the cell’s apparatus for reproduction. Bacteria are single celled organisms. Some classify them as a separate (fourth) kingdom on the tree of life. Fungi are multi-celled organisms that form a third Kingdom of life‚ along with the plant kingdom and the animal kingdom. Parasites are plants or animals that derive benefit
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DOLP- Fungi General Structure and Function: For many years‚ fungi were classified into the plantae kingdom because the two kingdoms seemed to be alike; but now‚ we know that they are all too different. In fact‚ the fungi kingdom is more closely related to the animalia kingdom. Some of the only notable similarities between the fungi and plantae kingdoms are that they are both made of eukaryotic cells‚ both immobile‚ both contain cell walls (although made of different material)‚ and both evolved
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Fungi Web quest Amanitas Amanita (various species) Family: Amanitaceae (amanitas) in the phylum Basidiomycota (club fungi) Description: There are about 600 species in the genus Amanita worldwide. Each amanita starts as an egg-shaped button that can resemble a small puffball. These breaks open as the mushroom grows. Fully developed amanitas are gilled mushrooms with parasol-shaped
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COMMON HEALTH PROBLEM AT EARLY CHILDHOOD INTRODUCTION: Illness is an inevitable part of childhood. Children will get sick and each illness may affect different children to different degrees. Diseases can be devastating for anyone‚ but it seems particularly unfair when they attack children. Unfortunately‚ many diseases seem to take a special interest in the young‚ infecting them more frequently and vigorously than they do adults. Children are more susceptible to diseases for a number of reasons
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