Exam 3 Flashcards
A sterilizer that employs superheated steam under pressure is called a(n): a) autoclave b) hot air oven c) cavitron d) filter e) Petroff Hauser cell
a) autoclave
An example of a generalized transducing phage: a) l phage b) P-22 phage c) o 6 phage d) QB phage
b) P-22 phage
The enzyme primase: a) is the same thing as DNA polymerase b) is a polymerase associated with RNA primer synthesis c) ligates two primer strands d) is a polymerase that transcribes RNA to DNA
b) is a polymerase associated with RNA primer synthesis
A substance that has been pasteurized: a) may contain pathogenic bacteria b) contains no microbial life c) has no bacterial spores d) is not considered sterile e) is considered dangerous to ones health
d) is not considered sterile
Organisms that have a wide range of growth temperatures are said to be: a) eurythermal b) stenothermal c) psychrophilic d) minithermal e) allthermal
a) eurythermal
Ultraviolet light damages bacterial cells by affecting the: a) bacterial cell wall b) bacterial DNA c) cell membrane d) bacterial ribosomes e) bacterial flagella
b) bacterial DNA
An organism that requires oxygen but at lower concentrations than those found in the atmosphere is called: a) basophilic b) microaerophilic c) aerobic d) barotolerant
b) microaerophilic
Organisms that require high salt concentrations in order to grow are called: a) barotolerant b) stenothermal c) halophilic d) microaerophilic e) aerobic
c) halophilic
Activities of a chemotherapeutic agent that damage the host: a) plasmids b) broad spectrum c) side effects d) antimetabolites
c) side effects
Your swimming pool has been overrun with algae. What would you use to kill these algae? a) mercuric nitrate b) copper sulfate c) potassium phosphate d) potassium nitrate
b) copper sulfate
A codon is made up of: a) 1 nucleotide b) 3 nucleotides c) 1 base d) a long series of nucleotides
b) 3 nucleotides
What is the last step of translation? a) assembly of the 30 S initiation complex b) attachment of the first tRNA to the mRNA c) binding of the first tRNA to the P site d) translocation e) termination
e) termination
An example of a cationic detergent that interacts with the cell membrane: a) quaternary ammonium b) alcohols c) phenol d) chloramine T
a) quaternary ammonium
An anti-microbial agent that kills bacteria is called: a) bactericidal b) bacteriostatic c)algilytic d) proteostatic e) fungicidal
a) bactericidal
The enzyme responsible for sealing Okasaki fragments is: a) gyrase b) DNA polymerase c) lipase d) primase e) ligase
e) ligase
Which organism would not produce catalase? a) Staphylococcus aureus b) Pseudomonas aeruginosa c) Bacillus subtilis d) Bacteriodes amylophilus
d) Bacteriodes amylophilus
The region of DNA to which the RNA polymerase binds; a) leader sequence b) Okasaki fragment c) promoter d) nucleosome e) gene
c) promoter
An example of an organism that would be found growing in jam: a) Bacillus subtilis b) Xeromyces sp. c) Rhodospirillum sp. d) Ruminococcus sp.
b) Xeromyces sp.
The prevention of infection of living tissues by microorganisms is called: a) disinfection b) antisepsis c) sterilization d) sanitization
b) antisepsis
The construction of protein from mRNA is: a) replication b) transcription c) translation d) metabolism
c) translation
The lowest temperature at which a microbial population is killed in a specific period of time is the: a) thermal death time b) thermal death point c) decimal reduction time d) z value
b) thermal death point
This antibiotic is active against rickettsias, chlamydias, and gram negative bacteria: a) tetracycline b) sulfanilimide c) penicillin d) amphoteracin e) ampicillin
a) tetracycline
An example of a cephalosporin: a) Keflex b) ampicillin c) tetracyclin d) interferon
a) Keflex
A period of two hours at 160C is required for killing bacteria: a) in an autoclave b) if free flowing steam is used c) in a hot air oven d) if ultraviolet light is used e) in the cavitron
c) in a hot air oven
An example of an obligate anaerobe: a) Bacillus subtilis b) Escherichia coli c) Methanococcus jannaschii d) Streptococcus pyrogenes
c) Methanococcus jannaschii
Removal of microorganisms from liquids and gases by passing the material through a substance with pore sizes designed not to allow microorganisms to penetrate: a) tyndallization b) pasteurization c) filtration d) sanitization
c) filtration
Organisms that grow at high temperatures are called: a) halophiles b) basophiles c) thermophiles d) psychrophiles
c) thermophiles
Will all point mutations lead to an observable change in the protein for which it codes? a) yes b) no
b) no
The effect of penicillin is more evident in Gram positive bacteria than in Gram negative bacteria: a) true b) false
a) true
Small circular DNA molecules that can exist seperate from the chromosome or be integrated into it: a) antibiotics b) disinfectant c) plasmid d) nucleosomes e) genes
c) plasmid
Which of the following does not inhibit protein synthesis: a) chloramphenicol b) tetracycline c) streptomycin d) penicillin
d) penicillin
The compound used by Joseph Lister in the 1860s as a disinfectant: a) hypochlorite b) wescodyne c) phenol d) hydrogen peroxide e) sulfanilamide
c) phenol
Name a toxic form of oxygen: a) triplet oxygen b) singlet oxygen c) peroxide d) a and b e) b and c
e) b and c
Which of the following is a sterilizing gas that can be used on hospital gowns and instruments: a) iodine b) ethylene oxide c) lysol d) merthiolate e) nitrous oxide
b) ethylene oxide
The killing of spore forming bacteria by alternately heating to kill the vegetative cells and incubating to allow the germination of spores into vegetative cells that are then killed by another heating cycle is called: a) pasteurization b) germ theory c) tyndallization d) germination e) disinfection
c) tyndalization
Mutations that result in a change in the reading frame: a) point mutation b) missense mutation c) silent mutation d) induced mutation e) frameshift mutation
e) frameshift mutation
A drug that blocks the function of a metabolic pathway is called: a) growth factor analog b) nucleotide c) lysogen d) all of the above
a) growth factor analog
To what do the designations 3’ and 5’ refer? a) the number of phosphate molecules in a nucleotide b) the number of nitrogen atoms in a nitrogenous base c) the position of a nucleotide in single stranded DNA d) the carbon atoms in a carbohydrate’s ring e) the number of covalent bonds linking two nucleotides in the same DNA strand
d) the carbon atoms in a carbohydrate’s ring
An organism that can grow in sulfuric acid is said to be: a) basophilic b) barotolerant c) acidophilic d) psychrophilic e) barophilic
c) acidophilic
The two most important alcohol germicides are: a) ethanol and methanol b) ethanol and isopropanol c) methanol and butanol d) methanol and isopropanol
b) ethanol and isopropanol
It prevents gonorrhea of the eye in newborns: a) copper sulfate b) mercurochrome c) silver nitrate d) lead acetate
c) silver nitrate
An example of a hyperthermophilic bacteria: a) Escherichia coli b) Pyrolobus fumarii c) Yersinia entercolitica d) Trypanosoma cruzi e) Pseudomonas aeruginosa
b) Pyrolobus fumarii
Sulfanilamide is an example of an antimicrobial agent that resembles a growth factor. What is the growth factor it resembles? a) 5 fluorouracil b) phenylalanine c) PABA d) all of the above
c) PABA
When a chemotherapeutic agent attacks many different pathogens it is said to be: a) an antimetabolite b) broad spectrum c) narrow spectrum d) germicidal
b) broad spectrum
An example of an antiviral agent: a) griseofulvin b) ampicillin c) tetracyclin d) interferon e) Keflex
d) interferon
Which is the most rapid way to achieve sterilization? a) in an autoclave b) tyndallization c) in a pre-vacuum autoclave d) ultrasonic vibrations e) direct flame
d) ultrasonic vibrations
When a recipient cell acquires a piece of naked DNA from the environment it is called: a) conjugation b) transformation c) transduction d) transfection
b) transformation
An example of a aminoglycoside antibiotic: a) Keflex b) ampicillin c) streptomycin d) tetracycline
c) streptomycin
An example of an antifungal agent: a) polyoxin b) ampicillin c) tetracyclin d) interferon e) Keflex
a) polyoxin
The gas used in municipal water supplies to keep bacterial populations low: a) is a phenol derivative b) has an oligodynamic action c) is also used to preserve food d) is chlorine e) unites with the bacterial chromosome
d) is chlorine
