Straighterline BIO250 Microbiology Graded Exam 2 (New Version June 2024)

Question 1 Correct 4.17 points out of 4.17 The movement of substances from higher to lower concentration across a semipermeable membrane via a specific protein carrier but without energy expenditure is called . Select one: a. facilitated diffusion b. active transport c. diffusion d. endocytosis e. osmosis Question 2 Correct 4.17 points out of 4.17 An organism that cannot grow without oxygen is a/an . Select one: a. facultative anaerobe b. obligate anaerobe c. aerobe d. obligate aerobe e. microaerophile Straighterline BIO250 Microbiology Graded Exam 2 (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 32 mins 18 secs Grade 125.00 out of 125.00 (100%)Question 4 Correct 4.17 points out of 4.17 Which of the following properties is likely to be found in a pioneer colonizer of a biofilm on an artificial joint implant? Select one: a. The ability to grow at thermophilicbodytemperature (37 ºC) b. Surface structures for attaching to tissue c. The ability to use the titanium from the implant as an energy source d. No susceptibility to reactiveoxygen species like peroxides Question 5 Correct 4.17 points out of 4.17 Growth factors . Select one: a. are inorganic b. are synthesized by the organism c. contain elemental oxygen d. cannot be synthesized by the organism e. All of the choicesare correct. Which compound has the highest concentration in a cell? Select one: a. H 2O b. CO 2 c. CH 4 d. NH 3 e. Glucose Question 3 Correct 4.17 points out of 4.17Question 7 Correct 4.17 points out of 4.17 Which of the following require the cell to use energy? Select one: a. Endocytosis b. Diffusion c. Facilitated diffusion d. Osmosis Question 8 Correct 4.17 points out of 4.17 Noncompetitive inhibition is best described as . Select one: a. an anabolic reaction b. the end product binding to enzyme in noncompetitive site c. the substrate binding to DNA, blocking enzyme transcription d. the substrate binding to enzyme in a regulatory site e. the end product binding to DNA, blocking enzyme transcription The toxic superoxide ion is converted to harmless oxygen by two enzymes, . Select one: a. catalase and oxidase b. superoxide dismutase and hydrogen peroxidase c. superoxide dismutase and catalase d. catalase and hydrogen peroxidase e. superoxide dismutase and oxidase Question 6 Correct 4.17 points out of 4.17Question 10 Correct 4.17 points out of 4.17 Mixed acid fermentation . Select one: a. is seen in Streptococcus and Lactobacillus b. produces butyric acid c. produces several different acids plus CO 2 and H 2 gases d. also produces ethanol e. occurs in all bacteria Question 11 Correct 4.17 points out of 4.17 Which of the following processes is endergonic? Select one: a. The oxidation of glucose b. Carbon fixation c. Beta oxidation of fatty acids d. Burning wood e. Deamination Reduction of nitrogen-oxygen ions and compounds by some bacteria is called . Select one: a. fermentation b. deamination c. nitrification d. denitrification e. aerobic respiration Question 9 Correct 4.17 points out of 4.17Question 13 Correct 4.17 points out of 4.17 Groups of three consecutive bases along the DNA of a gene have the code for one . Select one: a. amino acid b. purine c. protein d. nucleotide Question 14 Correct 4.17 points out of 4.17 Gene regulation can involve a protein repressor that blocks from initiating transcription. Select one: a. RNA polymerase b. DNA polymerase III c. rRNA d. DNA polymerase I e. mRNA In bacterial cells, the electron transport system is located in the . Select one: a. cell membrane b. ribosomes c. cytoplasm d. chloroplasts e. mitochondria Question 12 Correct 4.17 points out of 4.17Question 16 Correct 4.17 points out of 4.17 In Griffith's experiments with Streptococcus pneumoniae, rough nonencapsulated streptococci were converted into smooth encapsulated streptococci in the presence of the heat-killed smooth encapsulated streptococci. Which microbial process had Griffith identified? Select one: a. Cloning b. Transduction c. Conjugation d. Transformation Question 17 Correct 4.17 points out of 4.17 DNA polymerase III . Select one: a. synthesizes new DNA only in the 5' to 3' direction b. synthesizes an RNA primer c. is needed for adding nucleotides during mRNA synthesis d. cannot add nucleotides to the lagging strand If a codon for alanine is GCA, then the anticodon is . Select one: a. ACG b. GCA c. CGU d. UGC e. CGT Question 15 Correct 4.17 points out of 4.17Question 19 Correct 4.17 points out of 4.17 Erythromcycin, a macrolide, inhibits protein synthesis . Select one: a. by preventing the formation of the initiation complex b. by binding to the tRNA preventing peptide bond formation between amino acids c. by interfering with both the initiation and elongation stages of translation d. by binding to the ribosome, preventing translocation due to interference with the attachment of mRNA Question 20 Correct 4.17 points out of 4.17 DNA polymerases used in PCR . Select one: a. must remain active at very cold temperatures b. use an RNA template to make complementary DNA c. include Taq polymerases and Vent polymerase d. are labeled with fluorescent dyes The transfer of DNA fragments from a dead cell to a live, competent recipient cell that results in a changed recipient cell is termed . Select one: a. transmission b. mitosis c. conjugation d. transduction e. transformation Question 18 Correct 4.17 points out of 4.17Question 22 Correct 4.17 points out of 4.17 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. formalin c. chlorhexidine d. triclosan e. carbolic acid Question 23 Correct 4.17 points out of 4.17 Which of the following represents the use of osmotic pressure as a microbial control method? Select one: a. Exposing dental equipment to UV light b. Bleaching a kitchen counter c. Rinsing of a cut with Betadine d. Salting of meat DNA strands can begin to separate at the temperature of . Select one: a. 60 oC b. 100 oC c. 42 oC d. 90 oC e. 37 oC Question 21 Correct 4.17 points out of 4.17Question 25 Correct 4.17 points out of 4.17 Antiviral drugs that target reverse transcriptase would be used to treat infections caused by . Select one: a. HIV b. influenza A virus c. respiratory syncytial virus d. hepatitis C virus e. herpes zoster virus Question 26 Correct 4.17 points out of 4.17 Each of the following is a mechanism for drug resistance transfer between microorganisms, except . Select one: a. transposons b. R-plasmids c. mutation d. conjugation Which of the following is a disadvantage of dry heat methods such as using a Bunsen burner to incinerate microbes from an inoculating loop and the use of a hot air oven? Select one: a. Use of an open flame can be dangerous and hot air ovens take much longer to sterilize than autoclaves. b. Bunsen burners take too long to sterilize and hot air ovens are hazardous for the operators. c. Neither of these methods actually sterilize; they only kill vegetative cells. d. Bunsen burners and hot air ovens only reach a maximum of 100 oC so they are not effective against endospores. Question 24 Correct 4.17 points out of 4.17Question 28 Correct 4.17 points out of 4.17 Drugs that target the plasma membrane are able to do so because . Select one: a. they target the phosphate group on the phospholipids, breaking down the bilayer b. they act as enzymes to break down the phospholipids c. they contain a lipid part that enables them to act as a detergent d. they are able to denature the membrane-associated proteins, creating pores thereby disrupting the integrity Question 29 Correct 4.17 points out of 4.17 Which of the following is not used to treat malaria? Select one: a. Metronidazole b. Meflaquine c. Chloroquine d. Primaquine e. Quinine 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 livestock will become resistant to the antibiotics and not respond to treatment when they have infections. b. The use of antibiotics for livestock means that there are not enough for use in the human population. c. Resistant bacteria grow in the animals and may then be passed to humans. d. The animals may become sick from the antibiotic ingestion. Question 27 Correct 4.17 points out of 4.17Quiz navigation 1 2 3 4 28 29 30 5 6 7 8 9 25 26 27 Show one page at a time Finish review © 2023 StraighterLine. All rights reserved Important characteristics of antimicrobial drugs include . Select one: a. low toxicity for human tissues b. high toxicity against microbial cells c. stability and solubility in body tissues and fluids d. All of the choices are correct. e. a lack of serious side effects in humans Question 30 Correct 4.17 points out of 4.17