A Culture Medium Consisting of Agar Peptone and Beef Heart Extract Is a/an
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Microbiology
| Question | Answer |
|---|---|
| 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 |
Source: https://www.studystack.com/flashcard-2020520
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