Micro Lab Final 1012-91 Al-Dujaili LSUE | 100% Correct

Cotton plugs or screw caps are used in test tubes containing sterile media or pure cultures to... - -prevent unfiltered air or dust particles from entering the tubes -maintain anaerobic conditions -and prevent culture from spilling *all of the above* If the pH of the medium is higher than 7.0, you can adjust to 7.0 by: - adding drops of HCL to *lower* it or NaOH to *raise* it The pH indicator in Simmons Citrate agar is what? - Bromothymol blue bacteria that show no preference, grow equally well in aerobic or anaerobic conditions are - facultative what protein gives milk its white color? - casein (from the milk biology handout) beef extract is a source of: - -salt -carbohydrates -vitamins *all of the above* bacteria that grow in the dark and in media composed mainly of organic compounds are - heterotrophic