MCQ on psychrophiles

Psychrophiles are Cold-loving organisms, they can grow at 0°C. Based on their permissive temperature, psychrophiles can be broadly classified into two groups: True psychrophiles and psychrotrophs. True psychrophiles: They are sensitive to temperatures over 20°C. Optimum growth occurs at 15°C or below. Found in very cold environments. Answer: a. Clarification: Microorganisms causing spoilage of fresh meat, poultry, dairy products and eggs are mostly at 20 deg C. 11. Statement 1: Bacteria at a count of a few low millions in milk are psychrotrophic. Statement 2: Psychrotrophic bacteria can re contaminate milk after pasteurization 47. Psychrophiles are grown in temperature between a) 20 to 45 °C b) 70 to 110 °C c) -5 to 10 °C d) -5 to 20 °C. 48. PH of Simmons citrate Agar medium is. a) 4.9 b) 3.9 (c 7.9 d) 6.9. 49. Organism used in R-W test a) S. aureus b) S. typhi c) E. coli d) Proteus vulgaris. 50. Redox potential in viscous emulsion is high because a) High. A. Condition in the medium become less but cell still have the ability to divide rapidly. B. Condition in the medium become less and cell lose their ability to divide. C. Number of live cells increases at a logarithmic rate. 11. Growth are referring to the number of cells, not the size. A

Psychrophiles are tolerant of what? Low temperatures. Give an example of a psychrophile and where it can be found. Chlamydomonas nivalis, a green alga which appears red on the surface of snow. It can occasionally be found colouring snow in high altitude areas of NZ ADVERTISEMENTS: The following points highlight the six important groups of extremophiles. The groups are: 1. Acidophiles 2. Alkalophiles 3. Halophiles 4. Psychrophiles 5. Thermophiles and Hyperthermophlies 6. Barophiles. Group # 1. Acidophiles: Most natural environments on the earth are essentially neutral, having pH between 5 and 9. Only a few microbial species can grow at [ 2) Log Phase: exponential growth, bacteria multiply at the fastest rate possible. 3) Stationary Phase: nutrients are exhausted and waste products build up. 4) Death Phase: the number of deaths exceeds the number of new cells being formed. List/describe the five groups of bacteria based on oxygen requirements and tolerance (5) 1) Obligate.

Current Affairs, GK & News related notes on Psychrophiles topic for UPSC, Civil Services, Banking and other Competitive Examinations of India. Best current affairs & GK article on Psychrophiles Examples of Multiple Choice Questions for Exam 1, Biology 250. Letters for correct answers are capitalized. 1. A slippery outer covering in some bacteria that protects them from phagocytosis by host cells is A. capsule b. cell wall c. flagellum d. peptidoglycan 2 25. EMB agar is a medium used in the identification and isolation of pathogenic bacteria. It contains digested meat proteins as a source of organic nutrients. Two indicator dyes, eosin and methylene blue, inhibit the growth of gram-positive bacteria and distinguish between lactose fermenting and nonlactose fermenting organisms

ADVERTISEMENTS: List of 85+ MCQs on soil science ! This will help you to learn about the frequently asked objective type questions on soil science especially compiled for ICAR, ARS, IARI Ph.D and other competitive exams. ADVERTISEMENTS: 1. Hue denotes (A) Dominant spectrum (B) Lightness or brightness (C) Purity ADVERTISEMENTS: (D) Intensity Ans. A 2. [ b) It is the structure principally responsible for the reaction of gram staining. c) It is a unique flexible plastic structure. d) It contains D-isomers of amino acids. # Endotoxins have all but one of the properties given below: (KAR-97) a) Produced by gram negative bacteria. b) Produced by gram positive bacteria Psychrophiles: Grow at a temperature range of 0 ℃ to 20 ℃. They are further classified as, Obligate psychrophiles. Facultative psychrophiles. MCQ Test on History of Microbiology. 3) MCQ Test on Preservation of Cultures. 4) MCQ Test on Manufacturing Defects of Tablets Salmonella. 5. If I start with one bacterium (generation 0), how many bacteria would I have by generation 4 produced by binary fission? a. 2 b. 4 c. 8 d. 16 e. 32. 6. Which phase in a population growth curve is associated with no increase or decrease in population? a. lag phase. b. logarithmic phase. c. stationary phase

Psychrophiles, Mesophiles, Thermophiles • Microbe Onlin

  1. ated tissue for 7 years but only for 3 months on.
  2. content? (a)bacteria (b)yeast (c)algae (d)protozoa 2.Whatis the pH required for production of baker's yeast? (a)1 to 2 (b)4 to 5 (c)7 to 8 (c)10 to 12 3.Rhizopus nigricans produces which of the following products? (a)citric acid (b)fumaric.
  3. MCQ for Lab Technician 1. MULTIPLE CHOICE OF LAB TECHNOLOGY 1. Eosinophil contains just about. large granules A) 100 B) 200 C) 300 D) 400 2
  4. bacterial growth mcq 1. Multiple antibiotic resistance is mediated by [A]. Episome [B]. Plasmid [C]. Colplasmid [D]. Both b and c 2. Antagonism is seen in [A]. Lag phase [B]. Plasmids [C]. Log phase [D]. None of these 3. the first phase of a growth curve is [A]. Log phase [B]. Lag phase [C]. phase [D]. Both a and b 4. In gram positive and gram negative bacteria the electron transport.
  5. Bacteria which have optimum temperature below 20 o C are known as Psychrophiles. Bacillus globisporus is an obligate psychrophile, MCQs. 1. Elements which are required in trace quantity for the growth of microorganisms are called? a. Essential elements. b. Trace elements

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A. Psychrophiles: Cold-loving. Can grow at 0oC. Two groups: True Psychrophiles: Sensitive to temperatures over 20 oC. Optimum growth at 15 C or below. Found in very cold environments (North pole, ocean depths). Seldom cause disease or food spoilage. Psychrotrophs: Optimum growth at 20 to 30oC Psychrophiles grow best in the temperature range of 0-15 °C whereas psychrotrophs thrive between 4°C and 25 °C. Mesophiles grow best at moderate temperatures in the range of 20 °C to about 45 °C. Pathogens are usually mesophiles. Thermophiles and hyperthemophiles are adapted to life at temperatures above 50 °C Environment Quiz Questions - Environment stands for surrounding and it has been defined as the sum total of all conditions and influences that affect the development of an organism. Here, we are giving the Environment Quiz Questions with answers on the Basic Concepts of Environment and Ecology in the form of multiple choice questions which strengthen the knowledge of aspirants who are. Multiple choice questions will appear throughout both exam papers (Breadth and Depth), and at both Foundation Tier and Higher Tier. These questions provide you with a number of answers, from which you must select the answer or answers that you think are correct. Psychrophiles would be expected to grow: a) in hot springs. b) on the human body Soil Science Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries

Pharmacetical Microbiology MCQs with Answers - Remix educatio

Human pathogens fall into the group A. psychrophiles. B. thermophiles. C. halophiles. D. mesophiles. E. acidophiles Microbiology (Part- 4) MCQs with Answers. by Fenee Patel May 20, 2021 May 20, 2021 0 67. MICROBIOLOGY-2. 51. The bases Adenine and Thymine are paired with a. Double hydrogen bonds b. Single hydrogen bonds Psychrophiles b. Facultative psychrophiles c. Average psychrophiles d. Mesophiles. 90. Radical shifts can be prevented by adding a. Acids. Bacteriology mcq with answers pdf Last updated on October 17th, 2018 The identification of bacteria by serologic tests is based on the presence of specific antigens. Which of the following bacterial components is least likely to contain useful antigens? They are called a. psychrophiles b. thermophiles C. mesophiles d. halophiles 28. The. All of the following could find a location in or on body tissues suitable for growth except A. psychrophiles. B. anaerobes. C. facultative anaerobes Study Chapter 7 Multiple Choice Questions flashcards from Emily DiGiovanni's Case Western Reserve University class online, or in Brainscape's iPhone or Android app. Learn faster with spaced repetition

Question 15. SURVEY. 120 seconds. Report an issue. Q. Extremophiles are organisms that. answer choices. are adapted to grow optimally at or near to extreme ranges of environmental variable. can tolerate at or near to extreme ranges of environmental variable a) Psychrophiles b) Mesophiles c) Thermophiles d) Halophiles. 17. Rotational stocking is the method of. a. Storage of feed b. Feeding of animal c. Grazing of animal d. Management of pasture. 18. Concentrate is a feed containing more than % TDN. a) 20 b) 10 c) 60 d) 30. 19. Common site of occurrence of haematoma in dog is. a. Ear b. Eyelid c.

A comprehensive database of more than 136 microbiology quizzes online, test your knowledge with microbiology quiz questions. Our online microbiology trivia quizzes can be adapted to suit your requirements for taking some of the top microbiology quizzes. Page psychrophiles <20 C; high levels of unsaturated fatty acids --> remain fluid at low temperature; mesophile 20-40 C; thermophile >40 C and < 65 C; extreme thermophiles > 65 C; hot water heaters, hot springs, vents; E.g. Pyrodictum, min 82 opt 105 max 110 C; extremes have lipids, proteins adaptation; PCR - Thermus aquaticu CH-07: Test Bank Multiple Choice Questions 1. Many lakes in the United States are suffering from periodic algae blooms, which can be thought of as an infection of the lake. Although the algae are naturally-occurring in the lake, when adjacent farm fields are over-fertilized with diammonium phosphate, the run-off deposits these nutrients in the lake, allowing the algae to grow without limit Biotechnology SET MCQ Questions 31-40. 31. The absorption coefficient of a protein at 600nm is 12000 M-1 cm-1 . What is the absorbance of 1mg/ml (4.5 X 10-5 M) solution across a 1-cm path length? A) 0.870 B) 0.720 C) 0.540 D) 0.420. 32. Assertion (A): Phosphoenolpyruvate has a high phosphoryl-transfer potential

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Extremophiles Questions and Study Guide Quizlet

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  2. LearnSmart Online Access for Microbiology Fundamentals A Clinical Approach C (1st Edition) Edit edition Solutions for Chapter 6 Problem 38MCQ: Human pathogens fall into the groupA. psychrophiles.B. thermophiles.C. halophiles.D. mesophiles.E. acidophiles.
  3. A. psychrophiles. B. thermophiles. C. halophiles. D. mesophiles. E. acidophiles. Step-by-step solution. Chapter 6, Problem 38MCQ is solved. View this answer View this answer View this answer done loading. View a sample solution. Step 1 of 5. Step 2 of 5. Step 3 of 5. Step 4 of 5. Step 5 of 5. Back to top
  4. ation (Masters/Ph.D. Admission), Pharmacy Exam Questions, Quiz, Study Material, UGC NET JRF Exam acidophiles, aerobes, aerotolerant, alkaliphiles, anaerobes, bacterial growth mcq, bacterial growth.
  5. Clinical Focus: Nataliya, Resolution. This example concludes Nataliya's story that started in How Microbes Grow and Oxygen Requirements for Microbial Growth.. The presence of Listeria in Nataliya's blood suggests that her symptoms are due to listeriosis, an infection caused by L. monocytogenes.Listeriosis is a serious infection with a 20% mortality rate and is a particular risk to Nataliya.
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Environmental Biology-Environmental Biotechnology: Questions 1-5 of 10. Get to the point NTA-NET (Based on NTA-UGC) Environmental Science (Paper-II) questions for your exams View Test Prep - question_bank_food_tech from BIOTECHNOL 02 at Biotechnology H S. Question Bank of Food Technology BST-264 1 2 Which of the following is NOT an intrinsic factor in foo

C. Psychrophiles - adapted to very low temperatures D. Hyperthermophiles - adapted to high temperatures E. Thermo plasmas - adapted to frozen environments. E. Thermo plasmas- adapted to frozen environments. Two major structures that allow bacteria to adhere to surfaces are ___ and ___. A. Pili, ribosomes B. Fimbrae, capsule Psychrophiles: These bacteria are cold loving microbes that grow within a temperature range of 0-20 o Most of soil and water saprophytes belong to this group. Mesophiles: These are moderate temperature loving microbes that grow between 25 o C and 40 o Most of pathogenic bacteria belong to this group. Thermophiles: These are heat loving microbes

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  1. 1. A) spread-plate method 2. B) pour-plate method 3. C) live staining and direct counting with a microscope 4. D) both spread- and pour-plate methods Answer: B Bloom's Taxonomy: 3-4: Applying/Analyzing Chapter Section: 5.7 8) Bacteria that are able to grow in humans and cause disease would be classified as 1. A) psychrophiles. 2
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Psychrophiles Current Affairs, GK & News - GKToda

Sterilize swab, dip in distilled water, run on skin, transfer to nutrient agar, incubate at 35 C for 48 hours and examine for colonies. Demonstrate how microbes in the air are sampled: Expose nutrient agar to air for 30 minutes. Replace and cover and incubate at 35C for 48 hours - examine for colonies. Fomite Psychrophiles: Can live in cold temperatures, for example, in glaciers. Growth and Reproduction of Bacteria. Bacteria can be reproduced by these following methods; Binary fission; It is an asexual method, where the bacterial cell grows and then form a new cell wall between the center and divides into two identical daughter cell A mesophile is an organism that grows best in moderate temperature, neither too hot nor too cold, with an optimum growth range from 20 to 45 °C (68 to 113 °F). The term is mainly applied to microorganisms.Organisms that prefer extreme environments are known as extremophiles.Mesophiles have diverse classifications, belonging to two domains: Bacteria, Archaea, and to kingdom Fungi of domain. Microbiology MCQ Microbiology Chapter 6 Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt? 23:36 Microbiology Chapter 6 A) Psychrophiles psychrophiles FBQ The mean growth rate constant (K) is the reciprocal of the _. generation time FBQ The two main areas of research in Microbiology are basic and _. MCQ One of these is not an agricultural activity of microorganisms: Digestion of cellulose present in grasses on which ruminant animals feed Cycling o

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Q) Difference between psychrophiles and mesophiles. Q) Define differential and selective media. Q) What is oxygen toxicity? Q) Define: Microaerophiles & Capnophiles. Q) What is the dry mount technique? Q) Classify bacteria according to temperature requirements and give the temp range for each class. Q) What are endospores Fig. 2.1: Effect of temperature on specific growth rate of psychrophiles, mesophiles and thermophilic microorganisms (Ward, 1992). 2.3.3 pH As with temperature, microorganisms have an optimum and a pH range in which they grow. Most microorganisms grow between pH 5 and 7. Generally fungi and yeast grow in acidic conditions (pH4-6) Psychrophiles, which can readily grow at temperatures often below 0 °C. 3. Halophiles, which can be completely dependent on salt concentrations exceeding the salinity of seawater by more than a factor of ten. 4. Alkaliphiles, which can easily thrive at pH values exceeding 10. 5. Acidophiles, which can easily thrive at pH values close to 0. 6 Q. During the Lag Phase, bacteria are. doubling the number of cells every generation. creating new cells at the same rate as cells are dying. making proteins, ribosomes, obtaining nutrients. dying at a faster rate than they are being produced. Q. During the stationary phase, bacteria are

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(i) Temperature: Psychrophiles, Mesophiles, Thermophiles (ii) Gaseous requirements: Aerobic, Anaerobic, Facultative, Microaerophilic, Oxygen toxicity (iii) pH (Hydrogen Ion Concentration) (iv) Miscellaneous physical requirements: Osmotic pressure Unit:2 Bacterial Growth a. Bacterial and Archaeal reproduction by binary fission b Environment Quiz - Green Olympiad Practice Questions 11. 1.This islands are famed for their vast number of endemic species and were studied by Charles Darwin during the voyage of the Beagle. 2.The Encantadas, or Enchanted Isles is a novella by American author Herman Melville which consists of ten philosophical Sketches on the islands Practice Questions for Animal Reproduction. Summary - Business finance I - based on textbook and lectures. Acute Care Nursing 2 Lecture notes, lectures 1, 3 - 6, 9 and 10. Chemistry 2 Notes. A2 Report - Grade: 7. Revision Notes For Business Economics (23115): complete exam notes. LIFM Notes. Sample 2. Chapter 2 Quiz & Answers Rajasthan Pre PG Old Question Paper 2016 Agriculture Exams Study Material Agronomy Horticulture Plant Pathology Entemology Plant Breeding Genetic

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Psychrophiles (cold-loving) can grow at 0 o C, and some even as low as -10 o C; their upper limit is often about 25 o C. Mesophiles grow in the moderate temperature range, from about 20 o C (or lower) to 45 o C. Thermophiles are heat-loving, with an optimum growth temperature of 50 o or more, a maximum of up to 70 o C or more, and a minimum of. Psychrophiles (Psychrotrophs), those organisms are grown between the temperature ranges of 2°C to 20-30°C. ii. Mesophiles, the organism preferably grow at the temperature between 20°C and 45°C and . iii. Thermophiles, the organisms grow better in range of 55°C-65°C Because they are active at low temperature, psychrophiles and psychrotrophs are important decomposers in cold climates. Organisms that grow at optimum temperatures of 50 °C to a maximum of 80 °C are called thermophiles (heat loving). They do not multiply at room temperature. Thermophiles are widely distributed in hot springs, geothermal. D. All of the choices are correct. 75. All cells contain A. uracil in their DNA. B. ribosomes for protein synthesis. C. cell walls made of cellulose. D. organelles for compartmentalization. E. mitochondria to generate ATP CH-03: Micro Multiple Choice Questions 1. A microbiologist inoculates Staphylococcus aureus into a culture medium

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  1. Some Characteristics of Psychrotrophs and Psychrophiles p. 331 The Effect of Low Temperatures on Microbial Physiologic Mechanisms p. 333 Nature of the Low Heat Resistance of Psychrotrophs p. 336 High-Temperature Food Preservation and Characteristics of Thermophilic Microorganisms p. 341 Factors Affecting Heat Resistance in Microorganisms p. 34
  2. 13 Low Temperatures • Refrigeration (40-45oF) slows or stops bacterial growth • Freezing stops bacterial growth High Temperatures • Heating (165oF or higher) destroys bacteria for immediate service foods served in restaurants an
  3. o acids are : (A) Nonpolar and negatively charged at physiological pH (B) Nonpolar and positively charged at.
  4. Enzymes work by 2 mechanisms: 1. The Lock and Key Model. --The enzyme is like a lock with a specific shape into which the key (substrate) fits. --Enzymes are usually larger than the substrates that they act on. --Once formed, the products cannot fit into the active site and are thus released, leaving the site free
  5. utes Marks: 65. 65 MCQs distributed according to modules, with Topic of Specifications. Attempt all questions, each question carries one mark
  6. ii) Psychrotolerant (psychrotrophs, facultative psychrophiles) • grow at 0°C but have optima of 20 - 30°C iii) Mesophiles • Optimum temperature between 25 and 40°C • Minimum temperature between 15 and 20°C • Maximum temperature ≤ 45°C • Most common type of microbe e.g., E. coli Optimum temperature < 39°
  7. --The format is 100 multiple choice questions - 50 questions over until 4 in the same depth of treatment as any unit test and 50 questions spanning units 1-3, mostly the big take home points. For the diseases that we talked about do we need to know if it is GNC, GPC, OX+, and if so what do these things mean

On multiple choice questions (marked as MC): circle the most correct answer. On the modified true false questions (marked as M T/F): mark the statement as true or false. If the statement is false, modify the statement to be true. The short answer questions are marked with a (SA). PAGE 1. Dr. Whitney W. Cruz is studying a few bacteria below Psychrophiles have optimum temperature for growth at 15°C, however, few can grow even below 0°C. The maximum growth temperature of psychrophiles is around 20°C. The spoilage of refrigerated food takes place because of facultative psychrophiles. These are microorganisms that can grow at 0°C but have growth optima temperature between 20°-30°C Proteins exhibit marginal stabilities equivalent to only a small number of weak intermolecular interactions (Dill, 1990, Jaenicke, 1991a).Average values for the Gibbs free energy of stabilization (ΔG° stab) of medium size globular proteins are on the order of 50 kJ mol −1 (Pfeil, 1998).In this respect, proteins from extremophiles do not differ strongly from their mesophilic counterparts Study Exam 2 (Study Guide) flashcards from Robelyn Bagtas's University of Maryland-College Park class online, or in Brainscape's iPhone or Android app. Learn faster with spaced repetition