Bacterial growth patterns and the effects of environmental factors on properties of colonies ERIC LI Abstract In this experiment we work with different types of bacteria and experiment with their different properties and how they grow in certain situations. Different samples of bacteria cultures were gathered from different places such as the mouth‚ shaded mulch‚ and from the table top. The samples were collected by using a cotton swab and swiped onto a petri dish filled with nutrient agar. The
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Chapter 09 Cell Communication Multiple Choice Questions 1. The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers and toes) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. What type of signaling would this be considered? A. Direct contact B. Paracrine C. Endocrine D. Synaptic E. Autocrine If a cell responds to the ligand that it secretes‚ this is considered autocrine signaling.
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molecule binds to a receptor protein located at the cell’s surface or inside the cell. b. Transduction – the signal is converted to a form that can bring about a specific cellular response. c. Response – transduced signal triggers a specific cellular response. May be any imaginable cellular activity. 3. Describe a ligand-receptor interaction and state how such interactions initiate a signal-transduction system. Ligand – receptor interaction: when a signaling molecule specifically binds as
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and record the number of viable cells after a 24-hour incubation period. The measurement of absorbance may be used to analyze bacterial growth since the absorbance or the measure of the turbidity is directly proportional to the number of cells. Turbidity results from the deflection of light by bacterial cells present‚ thus‚ the more turbid the broth is‚ the more bacterial cells are present and the higher the absorbance reading is. There are four characteristic phases of growth of typical
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These receptors may be located either on the surface of target tissue‚ within the cytosol‚ or in the target cell’s nucleus Once a hormone is recognized by its target tissue or tissues‚ it can exert its biologic action by a process known as signal transduction PRINCIPLES OF ENDOCRINE FUNCTIION Chemical signalling can occur through endocrine‚ paracrine or autocrine pathways In classic endocrine signalling‚ a hormone carries a signal from a secretory gland across a large distance to a target tissue
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Practical 9: Examination of Bacterial Plates Objective: 1. To examine bacteria pigmentation‚ colony‚ margin characteristics‚ elevation properties‚ broth characteristics and agar stroke properties. 2. To examine bacteria growth characteristics on different culture media. Introduction: Bacterial species can sometimes be identified on the basis of how they appear on or in the different media. The pigmentation‚ size and shape of bacterial colonies as they grow on and in agar plates can
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STUDY QUESTIONS FOR TEST 3 (Major concepts)—CHAPTERS 5‚ 6‚ 7 This study guide does not include everything you need to know for the exam. It an overview of main topics that I thought were important in lecture—make sure you’ve studied your book‚ completed the questions at the end of each chapter‚ answered all of the study guide questions‚ and taken the practice exam a few times! I would recommend either writing out the answers or‚ if you’re studying with someone else‚ talk through these questions.
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Lecture 8 & 9 1. What are the components of signal transduction 2. What is the plant brassinosteroid pathway 3. What do phosphatases do 4. What is the abscisic acid pathway 5. What receptors are present in the a. b. Plasma membrane c. E.R. d. Cytoplasm e. Nucleus 6. 7. What does activation of phototropin and phytochrome do 8. What are the three diff interactions of signal transduction pathways 9. What is photomorphogenesis 10
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Ensuring the Social‚ Political‚ and Technological Protection of Water Quality Protecting Against Bacterial‚ Parasitic‚ and Protozoan Pathogens Nathan Pankowsky Contents Abstract....................................................................................................................................................... 2 Introduction ............................................................................................................................................... 3
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Bacterial Transformation Lab Introduction: In this experiment we transformed a strain of E. Coli bacteria without antibiotic resistance with plasmid DNA. This plasmid produces a fluorescent green glow under black light due to the gfp(green fluorescent protein) as well as antibiotic resistance. E. Coli cells will be plated on an agar medium‚ some with and some without the antibiotic ampicillin. Only bacterial cells that contain the plasmid will survive the ampicillin and produce the green glow
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