...Prokaryotes and Eukaryotes cell Cell theory states that all organisms are made of one or more cells. There are two basis types of cell: prokaryotes, which do not contain a nucleus, and eukaryotes, which have a true nucleus. The difference between the structure and functioning of prokaryotes and eukaryotes is so great that it is considered, by some, to be the most important distinction among groups of organisms. However, if we are to believe the endosymbiosis theory and that eukaryotes evolved from prokaryotes there must also be some fundamental similarities. A significant similarity is the fact that both prokaryotes and eukaryotes use the same genetic material (DNA) and genetic code to store and translate genetic information. But this genetic information is arranged very differently within the two types of cell. In eukaryotes the DNA is packed into chromatins and sequestered within a double membrane bound organelle, known as the nucleus, and is easily seen using a microscope. On the other hand, prokaryotes lack this distinct nucleus and nucleur membrane but instead have a nucleoid, which is an irregularly shaped region within the cell where the genetic information is localised in the form of a, usually circular, double strand of DNA. Prokaryotes and some eukaryotes are also known to have additional small satellite structures of DNA called plasmids. Both prokaryotes and eukaryotes also contain ribosomes which are the organelles responsible for accurately translating this...
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...small life. -Groups of Organisms that we will be studying : bacteria, viruses, funny, protozoa, algae and helminths (parasitic worm) -Microbiology consider the largest and most complex of biological sciences. Here we study the aspects of microbes- their genetics, their physiology, characteristics that may be harmful or beneficial, the ways they interact with the environment, the way they interact wit other organisms, and their uses in industry and agriculture. -Some professions of microbiology are: Geomicrobiologist (earth), marine microbiologist, medical technologist (pathogenic microbes and diseases), nurse epidemiologist and astrobiologist. 1.2 Prokaryotic- simple cells that lack a nucleus (referring it as karyon) found 3.5 billion years ago. Eukaryotes- more complex, contain a nucleus and other complex internal structures found 1.8 billion years ago. (the early eukaryotes probably similar to algae and protozoa, started lines of evolution that eventually gave rise to fungi, plants and multicellular animas such as worms and insects) organelles= are structure in cells that are bound by one or more membranes. ex. mitochondria. All prokaryotes are microorganisms and include the bacteria and archaeons. Only some eukaryotes are microorganisms primarily: algae, protozoa, and yeasts (types of fungi) and certain animals such as arthropods and worms. Evolution timeline picture: Earth, prokaryotes, eukaryotes, reptiles, cockroaches, mammals and then humans. -Microbial...
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...Chapter 17 Study Guide We will focus on only a few key concepts from this chapter. You should already be familiar with many of these concepts from other courses. 1. It is believed that the first organisms appeared on Earth around 3.8 billion years ago. What evidence do each of the following for this occurrence? • Stromatolites -the earliest forms of lfe for which we have clear fossil evidence -a bulbous mass of sedimentary layers of limestone accreted by microbes over years -within the outer layers, microbes grow as a microbial mat (sort of like a biofilm) -outer laters of mat contain oxygenic phototrips that exude bubbles of oxygen -a few mm below surface, red light supports bacteria photolyzing H2S to sulfate which is then reduced by lowe layers of sulface reducing bacteria -fossils formed as layers of phototropic microbial communities grew and died their form filled in by calcium carbonate or silica -accepted to date as eatly as 3.4 Gyr ago -too deformed to reveal the detailed structure of cells and the biological origin of such fossils is questioned by some researchers -mainly in isolated pools whose high salt concentration exclude predators • Microfossils -the most convincing evidence for ealy microbial life is the visua appearance of microfossils which are microscopic fossils in which minerals have precipitated and filled in the form of ancient microbial cells -dated bythe age of the rock formation in which they are found, which is based on...
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...Upon the discovery of an unknown microscopic organism, many thought provoking questions were formed in the mind of scientists. After further investigation, the scientists were able to conclude that the unknown organism is unicellular and is a eukaryote. Unicellular eukaryotes are an extremely interesting type of species with many of their own characteristics. Organelles, membrane-enclosed structures with specialized functions that are suspended in the cytosol of eukaryotic cells, are specifically designed to assist in the survival of the cell. For example, the nucleus, ribosomes, endoplasmic reticulum (ER), and Golgi apparatus are all specific organelles that should be present in a eukaryotic cell. The nucleus, which contains most of the genes in the eukaryotic cell, consists of the nuclear envelope, the nucleolus, and chromatin. Each of these three parts of nucleus plays an important role in the cell. The nuclear envelope separates the nucleus from the...
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...these dudes make to science and what type of experiments were involved in the discoveries they made? Louis Pasteur- Heat pasteurization- 1st vaccine for rabies. Found alcohol only produced in wine if yeast was present. “Swan necked” flasks experiment for spontaneous generation. Robert Koch- Studied anthrax, Koch’s postulates (germ theory) studied and awarded for TB research. Anton van Leewenhoek- Made the 1st lens to observe living microorganisms. The lens magnified up to 300x and were free of distortion. Edward Jenner- Studied small pox. Came up with the first vaccine for smallpox. Alexander Fleming- Discovered lysozyme (an enzyme) was found in tears, saliva, and sweat could kill bacteria. What issues and types of instruments are involved in visualizing bacteria and viruses with a compound light microscope? Reflection- transmission-absorption with florescence-refraction. Condenser-is a lens that serves to concentrate light from the illumination source that is in turn focused through the object and magnified by the objective lens. iris diaphragm-regulates the amount of light on the specimen. objective lenses- magnifies ranges from 10x to 40x, ocular lenses. stage- supports the slide for viewing. focusing knobs-moves the stage up and down for focusing. total magnification- take the power of the objective (4X, 10X, 40x) and multiply by the power of the eyepiece, usually 10X. What are the differences between a hanging drop slide vs a smear in examining...
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...Abstract Understanding evolution helps us solve biological problems that impact our lives. There are excellent examples of this in the field of medicine. To stay one step ahead of pathogenic diseases, researchers must understand the evolutionary patterns of disease-causing organisms. To control hereditary diseases in people, researchers study the evolutionary histories of the disease-causing genes. In these ways, knowledge of evolution can improve the quality of human life. Evolution played an important role not only for the present day humans but all living things today. As you all know, we didn’t just evolve out of nothing, we all have an ancestor whose ancestor’s ancestor is our ancestor and so on. When we can’t go back any further because of the given facts, we know that was every organism’s common ancestor. To understand the importance of evolution, we must gather some understanding of the meaning of evolution. Here is biological evolution defined by one of the most respected evolutionary biologists, Douglas Futuyma. "In the broadest sense, evolution is merely change, and so is all-pervasive; galaxies, languages, and political systems all evolve. Biological evolution ... is change in the properties of populations of organisms that transcend the lifetime of a single individual. The ontogeny of an individual is not considered evolution; individual organisms do not evolve. The changes in populations that are considered evolutionary are those that are inheritable via the...
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...Biology From Wikipedia, the free encyclopedia For other uses, see Biology (disambiguation). Biology deals with the study of the many varieties of living organisms. Clockwise from top left: Salmonella typhimurium, Phascolarctos cinereus, Athyrium filix-femina, Amanita muscaria, Agalychnis callidryas, and Brachypelma smithi Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, origin, evolution, distribution, and taxonomy.[1] Biology is a vast subject containing many subdivisions, topics, and disciplines. Among the most important topics are five unifying principles that can be said to be the fundamental axioms of modern biology:[2] 1. Cells are the basic unit of life 2. New species and inherited traits are the product of evolution 3. Genes are the basic unit of heredity 4. An organism regulates its internal environment to maintain a stable and constant condition 5. Living organisms consume and transform energy. Subdisciplines of biology are recognized on the basis of the scale at which organisms are studied and the methods used to study them: biochemistry examines the rudimentary chemistry of life; molecular biology studies the complex interactions of systems of biological molecules; cellular biology examines the basic building block of all life, the cell; physiology examines the physical and chemical functions of the tissues, organs, and organ systems of an organism; and ecology...
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...population that can breed under natural conditions and produce fertile offspring Hybridization- crossbreeding between species (rare) (ex, liger, mule) Types of Biodiversity * genetic diversity: sexual reproduction cases unique inherited combinations of traits * ecosystem diversity: variety of organisms and their environment * diversity of interactions: interdependence of species = stability * diversity of habitats: structural diversity increases biodiversity Loss of biodiversity -affects food -medicine -economics -carbon cycle ______________________________________________________________________________ Taxonomy (to arrange) - the science of identifying, classifying, and naming organisms - classification based on similarities in structure and function - classifying helps us find/identify and understand Seven Levels Remember Katy Perry's Cat Ordered Fine Guacamole Sunday King Phillip Came Over From Germany, Stinky 1. Species 2. Genus 3. Family - animals end in "-idae" , plants end in " -aceae" 4. Order 5. Class 6. Phylum 7. Kingdom Classification for humans: Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Primates Family: Hominidae Genus: Homo Species: sapians Binomial Nomenclature: 1. Genus (capitalized) (italics/underlined) 2. Species (not capitalized)(italics/underlined) Ex; Urses maritimus (polar bear) Dichotomous Key: tree diagram that divides by 2 each time - used to identify organisms Phylogeny:...
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...They have existed on this planet for about 3.5 billion years c. Over time plants, animals, and modern microorganisms evolved from them 2. Describe some of the negative impacts of microbes. d. Disease epidemics- an infectious disease that affects large numbers of people in a given area e. Chronic disease caused by bacteria i. Many disease once thought caused by environmental stressors actually caused by bacteria 1. Example: gastric ulcers a. Causative agent – Helicobacter pylori f. Examples: ii. Black Plague (Yersinia pestis bacterium)- killed 25 million Europeans between 1346-1350 iii. Influenza 1918-1919 killed more than all the wars combined iv. Cholera-vibrio cholerae v. Tuberculosis- mycobacterium tuberculosis g. Microbes affect all organisms h. Modern sanitation, vaccination, and effective antimicrobial treatments have reduced incidences of the worst disease i. Food transmitted pathogens- contaminated food carries bacteria vi. I.E E.coli, salmonella j. Antibiotic resistance bacteria- bacteria that can’t be...
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...requires a microscope to be seen c. Where did microbes come from? Evolutionary origins, fossil evidence; prokaryotic cells eukaryotic cells * bacteria is the oldest known life form. Oldest datable geographical evidence was 3.8 bya * eukayotic cells arose from divergent prokaryotic lines. Endosymbioses came from mitochondria and chloroplasts. Unicellular types came from simple multicellular forms metazoans; significance of cyanobacterial ancestors * presence of cyanobacteria-like chains of cells in stomatolite fossils represent growth of cyanobacteria * cyanobacteria photosynthesize like plants; they use H2O to synthesize O2. d. Microbial taxonomy & phylogeny (3 domains: Archaea, Bacteria, & Eukarya ) * the 3 domains (bacteria, archaea, and eukaryotes) evolved from a common cell * Archaea and bacteria include prokaryotes * Eukarya includes algae, plants, fungi, animals, and protists eukaryotes * Monera includes all 3 domains i. Taxonomic groupings: microbes in the different kingdoms of those domains ii. Similarities & differences: eukaryotic & prokaryotic cells; genomes iii. Metagenomics e. Who are the microbes: bacteria/archaea/fungi/protists/viruses; characterize/describe these * Bacteria: cells lacking a nucleus * Fungi: are in eukarya domain. A heterotrophic eukaryote with chitinous cell walls. * Protist: single-celled eukaryotic microbe, usually motile. Not a fungus * Virus: consists of a noncellular...
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...Evolution is the belief that all organisms evolved from other organisms in order to adapt to their environments. Scientists like Charles Darwin had many theories and predictions about evolution that helped shape the knowledge we have today. Darwinism is the idea that the strongest of a group will survive. Scientists know these changes happen through evidence found in living things, DNA, fossils, embryology, and comparative anatomy. Charles Darwin was know as the father of evolution because of his discoveries. He had beliefs of natural selection or the idea that organisms adapt to their environment and have offspring that adapt also. “Scientists comparing the genomes of members of the three domains of life—archaea, bacteria, and the eukaryotes...
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...the topics of microscopy and cell fractionation, followed by a review of the cell and the major organelles and structures of eukaryotic cells. A challenge with this chapter is to keep this data from simply being a list of parts. In addition to the structure and function of individual organelles, questions probe student understanding of the cell as a dynamic, interconnected system: the flow of membrane and proteins in the endomembrane system to the plasma membrane; the flow of information from the nucleus to the cytoplasm; and the connection between the cytoskeleton, the plasma membrane, and the extracellular matrix. An evolutionary perspective goes beyond structural distinctions between prokaryotes and eukaryotes to examine theories concerning the evolutionary origins of eukaryotes and key eukaryotic cell structures. Multiple-Choice Questions 1) When biologists wish to study the internal ultrastructure of cells, they can achieve the finest resolution by using A) a phase-contrast light microscope. B) a scanning electron microscope. C) a transmission electronic microscope. D) a confocal fluorescence microscope. E) a super-resolution fluorescence microscope. Answer: C Topic: Concept 6.1 Skill: Knowledge/Comprehension 2) The advantage of light microscopy over electron microscopy is that A) light microscopy provides for higher magnification than electron microscopy. B) light microscopy provides for higher resolving power than electron microscopy. C) light microscopy...
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...BiologyBiology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, and taxonomy.[1] Modern biology is a vast and eclectic field, composed of manybranches and subdisciplines. However, despite the broad scope of biology, there are certain general and unifying concepts within it that govern all study and research, consolidating it into single, coherent fields. In general, biology recognizes the cell as the basic unit of life, genes as the basic unit of heredity, and evolution as the engine that propels the synthesis and creation of new species. It is also understood today that all organisms survive by consuming and transforming energy and by regulating their internal environment to maintain a stable and vital condition. Subdisciplines of biology are defined by the scale at which organisms are studied, the kinds of organisms studied, and the methods used to study them: biochemistry examines the rudimentary chemistry of life; molecular biologystudies the complex interactions among biological molecules; botany studies the biology of plants; cellular biologyexamines the basic building-block of all life, the cell; physiology examines the physical and chemical functions oftissues, organs, and organ systems of an organism; evolutionary biology examines the processes that produced the diversity of life; and ecology examines how organisms interact in their environment.[2] HistoryThe term biology is...
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...are unicellular fungi and are similarly cultured as bacteria. Scientists grow yeast on a solid or liquid nutrient medium. Once transported onto the medium, yeasts require a period to adjust to their environment before they start dividing. This lag period may last several hours. Once they begin dividing, their numbers increase rapidly. This growth in numbers is called exponential growth because the yeast population doubles at equal time intervals. Eventually, there are limiting factors that contribute to the carrying capacity and the reproduction rate slows down until it enters the stationary phase. After a prolonged time in the stationary phase, the yeast cells, no longer having all the necessities to survive, begin to die in the death phase. Yeasts cells are useful “model system” to study the effects of UV light on complex, multicellular organisms. Yeasts are single-celled and easy to culture, so they are relatively simple to maintain. Yeasts are eukaryotes, meaning that their DNA and organelles are organized, which can replicate in much the same way as mammalian DNA (Using Yeast in Biology). A theory suggests that yeast and human genes have some surprising similarities. For example, humans have a gene that codes for myosin, a protein in our muscles that was surprisingly found in a gene in yeast that codes for the same protein. It was unexpected because yeasts don’t have muscles. Myosin is just one example of similarities between yeast and human DNA that is an indicator of their...
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...The Diversityof Life Lab Manual Stephen W. Ziser Department of Biology Pinnacle Campus for BIOL 1409 General Biology: The Diversity of Life Lab Activities, Homework & Lab Assignments 2013.8 Biol 1409: Diversity of Life – Lab Manual, Ziser, 2013.8 1 Biol 1409: Diversity of Life Ziser - Lab Manual Table of Contents 1. Overview of Semester Lab Activities Laboratory Activities . . . . . . . . . 2. Introduction to the Lab & Safety Information . . . . . 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 15 30 39 46 54 68 81 104 147 3. Laboratory Exercises Microscopy . . . . . . Taxonomy and Classification . Cells – The Basic Units of Life . Asexual & Sexual Reproduction Development & Life Cycles . . Ecosystems of Texas . . . . The Bacterial Kingdoms . . . The Protists . . . . . . The Fungi . . . . . . . The Plant Kingdom . . . . The Animal Kingdom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 13 17 22 26 29 . 32 . 42 . 50 . 59 . 89 4. Lab Reports (to be turned in - deadline dates as announced) Taxonomy...
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