Straighterline BIO250 Microbiology Midterm Exam (New Version June 2024)

Question 1 Correct 4.00 points out of 4.00 Which of the following does not indicate microbe involvement in energy and nutrient flow? Select one: a. Formation of greenhouse gases, CO 2 and methane b. Digestion of complex carbohydrates in animal diets c. Decomposition of dead matter and wastes d. Thermal hot springs warmed by heat from earth's interior Question 2 Correct 4.00 points out of 4.00 Which of the following is NOT a recent discovery that has had a huge impact on the understanding of microbiology? Select one: a. Small RNAs b. Human microbiome project c. All are significant discoveries. d. PCR technique e. Restriction enzymes Straighterline BIO250 Microbiology Midterm Exam (New Version June 2024) We are a team of experts offering class attendance for all Straighterline, Online ATI, HESI, NCLEX, Portage Learning, Sophia etc courses (including final proctored exams!!). We also write essays, discussion posts, research papers and school assignments. Should you need any of these services, Contact us via email: or : +1 (540) 753-5914. Guaranteed Passing! Live Courses | Sciences | BIO250 | BIO250_MH_V6 | Unit 12: Antimicrobial Treatment Started on State Finished Completed on Time taken 43 mins 57 secs Grade 196.00 out of 200.00 (98%)Question 4 Correct 4.00 points out of 4.00 Helminths are . Select one: a. infectious particles b. molds c. parasitic worms d. bacteria e. protozoa Question 5 Correct 4.00 points out of 4.00 Analysis of the small subunit rRNAs from all organisms in the three current domains suggests that . Select one: a. the Archaea are more closely related to bacteria than eukaryotes b. the eukaryotes arose from prokaryotes c. bacteria, archaea, and eukaryotes are not related d. all modern and extinct organisms on earth arose from a common ancestor A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working on . Select one: a. nomenclature b. recombinant DNA c. determining evolutionary relatedness d. bioremediation e. determining if that species is the cause of a new disease Question 3 Incorrect 0.00 points out of 4.00Question 7 Correct 4.00 points out of 4.00 Ionic bonds . Select one: a. are the weakest chemical bonds b. result from sharing electrons c. result from like charge attraction d. result from transferring electrons e. always involve carbon Question 8 Correct 4.00 points out of 4.00 A fat is called if all carbons of the fatty acid chain are single-bonded to 2 other carbons and 2 hydrogens. Select one: a. saturated b. unsaturated c. polyunsaturated d. monounsaturated NASA has published a list of criteria for identifying fossil bacteria in samples from Mars, as part of a search for evidence of life. Which of the following is good evidence for the presence of bacterial cells? Select one: a. Absence of carbon in the material b. Three-dimensional organization of cells in a starburst pattern c. No evidence of water in the surrounding mineral d. Cell size of 0.5 to 2 microns Question 6 Correct 4.00 points out of 4.00Question 10 Correct 4.00 points out of 4.00 Comparing transmission electron microscopy with scanning electron microscopy, the following statement is true. Select one: a. Transmission EM gives detail of theexternal architecture of cells. b. Transmission EM can provide good images of bacteria but not viruses. c. Transmission EM is used for internal detail of cells and subcellular structures. d. Transmission EM requires dyes. Question 11 Correct 4.00 points out of 4.00 Which type of microscope cannot image live specimens? Select one: a. Differential interference b. Phase-contrast c. Bright-field d. Dark-field e. Electron Hydrogen bonds . Select one: a. result from attractive forces between molecules with nonpolar ionic bonds b. are the strongest bonds between molecules c. result from attractive forces between molecules with polar ionic bonds d. result from attractive forces between molecules with polar covalent bonds e. result from attractive forces between molecules with nonpolar covalent bonds Question 9 Correct 4.00 points out of 4.00Question 13 Correct 4.00 points out of 4.00 Bacteria that require special growth factors and complex nutrients are termed . Select one: a. hemolytic b. aerobic c. fermentative d. anaerobic e. fastidious Question 14 Correct 4.00 points out of 4.00 The three physical forms of laboratory media are . Select one: a. solid, liquid, and gas b. reducing, transport, and enumeration c. a streak plate, a pour plate, and a broth d. solid, semisolid, and liquid The wavelength of light used and the numerical aperture governs . Select one: a. magnification b. contrast c. illumination d. size of the field e. resolution Question 12 Correct 4.00 points out of 4.00Question 16 Correct 4.00 points out of 4.00 Which of the following is mismatched? Select one: a. Firmicutes -gram-positive cell walls b. Mendosicutes -archaea cell walls c. Gracilicutes -gram-negative cell walls d. Tenericutes - waxy,acid-fast cell walls Question 17 Correct 4.00 points out of 4.00 The bacterial flagellum has three components. In order from the cytoplasm to the external environment, they are . Select one: a. basal body, filament, and hook b. filament, basal body, and hook c. filament, hook, and basal body d. hook, basal body, and filament e. basal body, hook, and filament The short, numerous appendages used by some bacterial cells for adhering to surfaces are called . Select one: a. fimbriae b. pili c. periplasmic flagella (axial filaments) d. flagella e. cilia Question 15 Correct 4.00 points out of 4.00Question 19 Correct 4.00 points out of 4.00 In eukaryotic cells, which of the following organelles contain DNA? Select one: a. Nucleus, mitochondria, and Golgi apparatus b. Nucleus, endoplasmic reticulum, and Golgi apparatus c. Nucleus, chloroplast, and mitochondrion d. Nucleus, nucleolus, and Golgi apparatus e. Nucleus, chloroplast, and peroxisome Question 20 Correct 4.00 points out of 4.00 During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a/an . Select one: a. seed b. cyst c. endospore d. trophozoite e. sporozoa The chemical components of ribosomes are proteins and . Select one: a. DNA b. mRNA c. tRNA d. rRNA Question 18 Correct 4.00 points out of 4.00Question 22 Correct 4.00 points out of 4.00 Viruses that infect bacteria are specifically called . Select one: a. viroids b. bacteriophages c. prions d. satellite viruses Question 23 Correct 4.00 points out of 4.00 Which of the following is/are type(s) of cytopathic effects? Select one: a. Rounding of cells b. Inclusions in the cytoplasm c. Inclusions in the nucleus d. Multinucleated giant cells e. All of thechoices are correct. Histones are . Select one: a. proteins of the cytoskeleton b. enzymes found in lysosomes c. found in polyribosomes d. proteins associated with DNA in the nucleus e. on the surface of rough endoplasmic reticulum Question 21 Correct 4.00 points out of 4.00Question 25 Correct 4.00 points out of 4.00 Diffusion of water through a semipermeable membrane is called . Select one: a. osmosis b. diffusion c. endocytosis d. facilitated diffusion e. active transport Question 26 Correct 4.00 points out of 4.00 When microbes live independently but cooperate and share nutrients, it is called . Select one: a. antibiosis b. synergism c. symbiosis d. mutualism Infectious protein particles are called . Select one: a. viroids b. phages c. oncogenic viruses d. spikes e. prions Question 24 Correct 4.00 points out of 4.00Question 28 Correct 4.00 points out of 4.00 The term obligate refers to . Select one: a. using chemicals for energy production b. the ability to exist in a wide range of conditions c. using light for energy production d. using oxygen for metabolism e. existing in a very narrow niche Question 29 Correct 4.00 points out of 4.00 An organism that grows slowly in the cold but has an optimum growth temperature of 30°C is called a/an . Select one: a. psychrotolerant microbe b. psychrophile c. thermoduricmicrobe d. extremophile e. thermophile An organism that cannot grow without oxygen is a/an . Select one: a. obligate aerobe b. aerobe c. microaerophile d. facultative anaerobe e. obligate anaerobe Question 27 Correct 4.00 points out of 4.00Question 31 Correct 4.00 points out of 4.00 Endospore-forming bacteria like Bacillus species begin the sporulation process with an asymmetric cell division to produce two cells with different fates. One will differentiate into the endospore, and the other is the sporangium that will ultimately lyse to release the mature endospore. During this asymmetric cell division, one of the compartments does not receive an intact copy of the chromosome. Which compartment can function with only part of the genome and why? Select one: a. The endospore; it is a dormant stage and requires very little to maintain its dormancy. b. The sporangium; much of the genome is "junk DNA" and not required for endospore maturation. c. The endospore; the endospore is built from the outside via the sporangium and not from the inside. d. The sporangium; it supports endospore development and then lyses. Question 32 Correct 4.00 points out of 4.00 Reactants are converted to products by . Select one: a. enzymes releasing energy b. enzymes binding to products c. reactants always releasing energy d. breaking and forming bonds What is the difference between mutualism and synergism? Select one: a. In a synergistic relationship, the organisms cannot survive without each other. b. In a synergistic relationship, both organisms benefit, but in a mutualistic relationship both organisms are harmed. c. In a mutualistic relationship, both organisms benefit, but in a synergistic relationship both organisms are harmed. d. In a mutualistic relationship,the organisms are dependent upon each other. Question 30 Correct 4.00 points out of 4.00Question 34 Correct 4.00 points out of 4.00 Which of the following processes is endergonic? Select one: a. Beta oxidation of fatty acids b. The oxidation of glucose c. Deamination d. Carbon fixation e. Burning wood Question 35 Correct 4.00 points out of 4.00 Your bacterium is growing on a type of medium called casein agar, which contains milk protein (casein). There is a clear zone around the growth area of the bacterium, showing that it is synthesizing the enzymes needed to catalyze the breakdown of casein. These enzymes are considered . Select one: a. exoenzymes b. ribozymes c. endoenzymes d. apoenzymes Ribozymes are . Select one: a. unique to prokaryotes b. ribosomes which catalyze reactions c. unique to eukaryotes d. catalysts for DNA splicing e. catalysts for RNA splicing Question 33 Correct 4.00 points out of 4.00Question 37 Correct 4.00 points out of 4.00 Synthesis of a repressible enzyme is inhibited by . Select one: a. substrate bound to promoter b. repressor alone bound to operator c. substrate bound to repressor d. corepressor and repressor binding to operator Question 38 Correct 4.00 points out of 4.00 Which of the following is not a type of bacterial DNA recombination? Select one: a. Transduction b. Transformation c. Conjugation d. Mitosis The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundle is . Select one: a. primase b. DNA polymerase c. DNA gyrase d. DNA helicase e. DNA ligase Question 36 Correct 4.00 points out of 4.00Question 40 Correct 4.00 points out of 4.00 Of the following list, which antibiotics affect protein synthesis? Select one: a. Tetracycline b. Chloramphenicol c. Ciprofloxacin d. Both tetracyclineand chloramphenicol are correct. e. Penicillin Question 41 Correct 4.00 points out of 4.00 DNA strands can begin to separate at the temperature of . Select one: a. 37 oC b. 100 oC c. 60 oC d. 42 oC e. 90 oC Base pairs in DNA are held together by bonds. Select one: a. nonpolarcovalent b. polarcovalent c. hydrogen d. peptide e. sulfhydryl Question 39 Correct 4.00 points out of 4.00Question 43 Correct 4.00 points out of 4.00 Using a HEPA filter in a vacuum or furnace is an example of which microbial control method? Select one: a. Surfactant b. Gases c. Dry control d. Chemical agent Question 44 Correct 4.00 points out of 4.00 Which control method would not be a suitable choice for killing Mycobacterium in a capped culture tube? Select one: a. Ultraviolet (germicidal) light b. Gamma rays c. All of the choices are correct. d. 160°C for 2 hours e. 121°C at 15 psi for 15 minutes Thermococcus litoralis and Thermus aquaticus are thermophilic bacteria that are . Select one: a. sources of heat-stable DNA polymerases b. used as cloning vectors c. genetically engineered bacteria d. principal sources of restriction endonucleases Question 42 Correct 4.00 points out of 4.00Question 46 Correct 4.00 points out of 4.00 Acyclovir is used to treat infections caused by . Select one: a. hepatitis C virus b. herpes simplex virus c. influenza A virus d. HIV e. respiratory syncytial virus Question 47 Correct 4.00 points out of 4.00 Over 50 percent of all sales of medically important antibiotics in the United States are for livestock use. Why is this problematic for humans? Select one: a. The use of antibiotics for livestock means that there are not enough for use in the human population. b. Resistant bacteria grow in the animals and may then be passed to humans. c. The livestock will become resistant to the antibiotics and not respond to treatment when they have infections. d. The animals may become sick from the antibiotic ingestion. The compound that is an organic base containing chlorine and two phenolic rings, and is used increasingly for wound degerming, neonatal washes, hand scrubbing, and prepping surgical skin sites is . Select one: a. a quaternary ammonium compound b. triclosan c. formalin d. chlorhexidine e. carbolic acid Question 45 Correct 4.00 points out of 4.00Question 49 Correct 4.00 points out of 4.00 Bacteriophages selectively infect bacterial cells. How might they be used as a therapeutic treatment in humans? Select one: a. Phages can carry genes into cells which will genetically modify the host cells to prevent infection. b. Humans suffering from infections with antibiotic resistant bacteria can be treated with phages, which will infect and lyse the bacterial cells, leaving human cells unaffected. c. Phages can be used to stimulate human immune cells to attack and kill bacterial cells. d. Bacteriophages can be used to genetically engineer bacterial cells making them more susceptible to drugs. Question 50 Correct 4.00 points out of 4.00 Which of these drugs has the most narrow-spectrum activity? Select one: a. Isoniazid b. Tetracycline c. Aminoglycosides d. Cephalosporins e. Erythromycin Each of the following contributes to emerging drug resistance except . Select one: a. addition of antibiotics to common household products b. ingestion of antibiotics with animal feed c. overuse of antibiotics d. improper use of antibiotics e. multiple drug therapy Question 48 Correct 4.00 points out of 4.00© 2023 StraighterLine. All rights reserved Quiz navigation 1 2 3 4 5 6 7 8 9 10 26 27 38 39 40 41 42 48 49 50 Show one page at a time Finish review