Agar is used for solidifying culture media because: it does not affect the growth of bacteria it does not add to the nutritive properties of the medium the melting and solidifying points of agar solution are not the same all of the above
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15. Agar is used for solidifying culture media because:
- it does not affect the growth of bacteria
- it does not add to the nutritive properties of the medium
- the melting and solidifying points of agar solution are not the same
- all of the above
Step by step
Solved in 2 steps
- 1. Which of the following is NOT true of spread plating method? A. the maximum inoculum allowed is 1.0 ml B. spreading of the inoculum is done using a disinfected glass L-rod C. A pre-solidified medium is required prior to inoculation of the sample. D. A and B 2. Plates inoculated with bacteria are inverted during incubation to: A. prevent contamination B. limit the colony growth C. A and B D. A and C E. All of the above F. None of the above1. The selective ingredient in mannitol salt agar is ______________, which selects for the growth of Staphylococcus organisms.1. The technique used in bacteria for endospore staining can also be used to observe fungal spores. Select one: True False 2. Which of the following statements is/are TRUE? a. Agar does not provide nutrients to microorganisms. b. Peptone, pork extracts, and yeast extracts provide nutrients to microbes. c. Tap water must be used for preparing culture media. d. A & B are correct. e. B & C are correct Clear my choice 3. Motility of microorganisms is BEST observed with a a. Flagellar stain b. Hanging drop preparation c. Solid medium d. Negative stain e. Streak plate Clear my choice
- 2) A pure culture A) is sterile. B) is a population of identical cells. C) is made of a clearly defined chemical medium. D) contains one microbial cell.9. The process in which all organisms and pathogens are destroyed is called ------. a) Disinfection b) Sterilization c) Antisepsis d) Pasteurization1. The Petri Dish method is used in microbiology to raise bacteria in: a) rapid growth b) pure culture c) septic environment d) all of the above 2. What is the difference between antiseptic and sanitization? 3. In order to prevent any kind of contamination the medium must be _________ before placing it in the Petri dish. a) lyophilized b) pasteurized c) autoclaved d) distilled
- Viruses were first described as “filterable agents” meaningthat(a) They were often discovered on filters used to retain mi-crobes(b) The filters that were used to sterilize microbial mediawould trap viruses(c) They would pass through filters that were capable of re-taining the smallest known bacteria(d) They were found to aggregate into structures that servedas coarse filters.A fastidious organism must be grown on what type of medium?a. general-purpose mediumb. differential mediumc. defined mediumd. enriched mediumDoctors prescribe synergistic drug combinations to treatbacterial infections. The purpose of such treatment is to:(a) Change the bacteria with cell walls to L forms lackingcell walls(b) Reduce the treatment time of the disease(c) Prevent microorganisms from acquiring drug resis-tance(d) Reduce the toxic side effects of the antibiotics(e) Use lower doses of antibiotics
- The main of objective of using 13-Line streaking method is to get: A-Contaminated cultures B-None of the above C-Overlapped colonies D-Separated colonies12/ Which of the following factors increases biofilm accumulation? (select all that apply) V A. malocclusion V B. smooth surfaces V C. calculus V D. restorations E. use of fluoridated 9/ During biofilm formation, microcolonies form in layers as the bacterial colonies multiply. With increased size, colonies meet and coalesce to form a complex microbial community. © A Both statements are true. A © B Both statements are false. C. The first statement is true, and the second statement is false. D. The first statement is false, and the second statement is true. Question 11 Which of the following is found in a disease periodontal pocket? © A Gram positive cocci and lactobacillus species. O B. Primarily jam negative motile rods and spirochetes • C. Gram positive aerobes © D. Keystone pathogens.The thermal death point is best described as:(a) The highest temperature that will support growth of amicrobial culture(b) The length of time required for killing 100% of mi-crobes in a 24-hour culture that is heated to 100°C(c) The temperature at which a previously growing 24-hourculture will begin to die(d) The temperature at which 100% of the microbes in a24-hour culture will be killed in 10 minutes
