Experiment 1.2: Human Microbiota Examine the mannitol salt agar and nutrient agar plates. Record the colony types and any changes to the agar. In particular, look for the presence of bright yellow colonies from the nasopharyngeal swab. This indicates that you may be a carrier of S. aureus (don't worry this is not unusual). Record your results and observations in the following table (see Appendix 1, pages 52, 53): Area (media) Colony types and morphologies Skin: forearms (mannitol salt agar) Skin: forehead (mannitol salt agar) Nasal cavity (mannitol salt agar) Throat (blood agar) Teeth (nutrient agar)

When grown on nutrient agar, Staphylococcus aureus are best described as: Group of answer choices Smooth red colonies Rhizoid white colonies Round pale yellow colonies Filamentous cream colonies

Your right-handed TA has pressed her hands onto agar plates.  There are four plates total--left hand palm, left hand top, right hand palm, right hand top.  They are incubated for growth.Which one of the four plates would you expect to contain the most diverse bacteria?  Why?What factors contribute to differences you might see between the plates?Which two plates would you expect to be the most similar to each other?  Why?

Mannitol Salt Agar (MSA) differentiates among bacteria based on their ability to ferment mannitol.Group of answer choicesTrueFalse

A culture medium containing salt and mannitol on which only gram positive organisms grow and a yellow halo surrounds Staphylococcus aureus is called a(n)Group of answer choicesSelective mediumEnrichment mediumselective and differential mediaselective and enriched mediaDifferential medium

Microbes on the skin can be:Group of answer choicesMicrosecularNormal floraExtraepicellularPathogensIntracellularTransient