front 1 If cells are grown in media containing amino acids labeled with radioactive nitrogen, most of radioactivity will be found in the cells | back 1 DNA and proteins |
front 2 Pathogenic bacteria isolated from the respiratory or intestinal tracts of human are | back 2 capnophiles that grew best in carbon dioxide incubators. |
front 3 The introductory biosafety level in labs is | back 3 BSL 1 |
front 4 The biosafety level working with potentially airborne pathogens is | back 4 BSL 3 |
front 5 Which of the following added to a culture medium will neutralize acids? | back 5 buffers |
front 6 Salts and sugars work to preserve foods by creating a | back 6 hypertonic enviroment |
front 7 The term aerotolerante anaerobe refers | back 7 It does not use oxygen but tolerates it |
front 8 Which the following is advantage of the standard plate count? | back 8 determines the number of viable cells |
front 9 Which of the following is an advantage of the direct microscopic count | back 9 requires no incubation time |
front 10 Most bacteria reproduce by | back 10 binary fusion |
front 11 Most bacteria grow best at PH | back 11 PH 7 |
front 12 Most fungi grow best at PH | back 12 PH 5 |
front 13 A culture medium on which only gram-positive grow and a yellow halo surrounds S. aureus colonies is called | back 13 Selective and differential medium |
front 14 A culture medium consisting of agar, peptone and beef heart is a | back 14 complex medium |
front 15 During which growth phase will gram positive bacteria be most susceptible to penicillin | back 15 log phase |
front 16 The source of nutrients in nutrient agar is | back 16 peptone and beef extract |
front 17 Patients with indwelling catheters are susceptible to infections because | back 17 biofilms develop on catheters |
front 18 Pure cultures can easily be obtained on streak plates, even if the desired bacteria are present in very low concentrations | back 18 False |
front 19 Turbidity is an indirect measurement of bacterial growth that can be measured using a pectrophotometer | back 19 True |
front 20 Filtration methods are used to count bacteria present in very low concentrations, such as in lakes and streams | back 20 True |
front 21 Nitrogen-fixing bacteria, such as cyanobacteria, can use atmospheric nitrogen for their nitrogen source | back 21 True |