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Microbiology

QuestionAnswer
If cells are grown in media containing amino acids labeled with radioactive nitrogen (15N), most of the radioactivity will be found in the cells' DNA and Proteins
Which of the following elements is NOT correctly matched with its cellular function? Phosphorus used for production of carbohydrates
The addition of which of the following to a culture medium will neutralize acids? Buffers
Salts and sugars work to preserve foods by creating a Hypertonic environment
The term aerotolerant anaerobe refers to an organism that does not use oxygen but tolerates it
Most bacteria grow best at pH 7
Most fungi grow best at pH 5
Which of the following pairs of microbe classification terms and optimal growth temperatures is mismatched? thermophile growth at 37 degrees celcius
Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt? facultative halophiles
Which of the following is an organic growth factor? vitamin B1
Which of the following is an example of a metabolic activity that could be used to measure microbial growth? glucose consumption
Patients with indwelling catheters (long-term tubes inserted into body orifices for drainage, such as through the urethra and into the urinary bladder) are susceptible to infections because biofilms develop on catheters
Pathogenic bacteria isolated from the respiratory or intestinal tracts of humans are capnophiles that grow best in carbon dioxide incubators
The biosafety level (BSL) for a clinical microbiology laboratory working with potentially airborne pathogens, such as tuberculosis bacteria, is BSL-3
Consider a culture medium on which only gram-positive organisms such as Staphylococcus aureus colonies can grow due to an elevated NaCl level. A yellow halo surrounds the growth, indicatingthebacteriumfermentedasugarinthemedium, low ph&change color- what type of medium is this--- selective and differential medium
A culture medium consisting of agar, peptone, and beef heart is a complex medium
The source of nutrients in nutrient agar is peptone and beef extract
Which of the following is an advantage of the standard plate count? determines the number of viable cells
Most bacteria reproduce by binary fission
During which growth phase will gram-positive bacteria be most susceptible to penicillin? log phase
Which of the following is the best definition of generation time? the length of time needed for a cell to divide
Which of the following regarding antimicrobial control agents is FALSE? A true antimicrobial control agent is equally effective against both bacteria and viruses
Which of the following is the best method to sterilize heat-labile solutions? membrane filtration
Which of the following could be used to sterilize plastic Petri plates in a plastic wrapper? gamma radiation
Which of the following regarding antimicrobial control agents is FALSE? Alcohols effectively inactive nonenveloped viruses by attacking lipids
All of the following substances are effective against nonenveloped viruses EXCEPT alcohol
All of the following are effective for destroying prions EXCEPT boiling
Which of the following pairs is mismatched? RNA polymerase makes a molecule of RNA from an RNA template
Which of the following statements is FALSE? DNA replication proceeds in only one direction around the bacterial chromosome
Which of the following is NOT a product of transcription? a new strand of DNA
If you knew the sequence of nucleotides within a gene, which one of the following could you determine with the most accuracy? the primary structure of the protein
The cancer gene ras produces mRNA containing an extra exon that includes a number of UAA codons. Cancer cells produce ras mRNA missing this exon. This mistake most likely is due to a mistake by snRNPs
Created by: pink23
 

 



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