MIP 300 Study Guide Questions and Answers Test
External function - Answer--Attachment to surfaces
-Protection from environment or phage
-Horizontal gene transfer
-Movement
Polysaccharide layers - Answer--Sugars
-Capsule
-Slime Layer
-Glycocalyx
Capsule - Answer-well organized layer, ...
MIP 300 Study Guide Questions
and Answers 2024-2025 Test
External function - Answer--Attachment to surfaces
-Protection from environment or phage
-Horizontal gene transfer
-Movement
Capsule - Answer-well organized layer, not easily removed
-Protects against dehydration
-Protects against phagocytosis
-Allows them to adhere.stick
Phagocytosis - Answer-Cell eating
- w/o capule cell compliments bind to cell and mark it for destruction
slime layer - Answer-Less organized, diffuse and easily removed
Glycocalyx - Answer-"Sugar shell"
Encompasses both capsule and slime layer
Have many bacteria in it
Biofilms - Answer-Protected by and attached by layers of polysachharides
-form on teeth roacks or other surfaces
-30% of implants removed because
-Quorum sensing
quorum sensing - Answer-The ability of bacteria to sense the presence of other bacteria
via secreted chemical signals.
once concentration is high enough
-Polysacharide production up
-antibiotic resistance genes goes down
-Flagella down
, Cell shape
Protects against pH, osmotic pressure, and antibacterial enzymes
attahcment
Mycolic acid layer - Answer-waxy outer layer in Mycobacterium
Somewhat resistant to:
dehydration
Antibiotics
phagocytosis
TB - Answer--Consumption
-PPD and chest x-rays
Pili - Answer-Small, short hair like appendages (3-10 nm diameter)
-most not for motility
-can twitch for motility
-adhere to host
-proteins
Bright Field Microscope - Answer--produces a dark image against a brighter
background,
-Most common
-Must fix cells
-Color of stain=bacteria color
-100x requires oil
-Light is bet through objective
-Basic dyes binf to neg
-Acidic dyes bind to pos
Dark Field Microscope - Answer--Background is dark, organism is light
-Light is refracted by organism
-in the field, dont have to heat fix or stain
ex.Syphilis
phase contrast microscope - Answer--Shades of grey to show contrast in cell
components
-slight differences in refractive indexes into light intensity
-Motility because no fixing or staining
fluorescence microscopy - Answer--Uses UV light to excite fluorescent molecules
-Some cells take up the dye
-Common in studying viruses
Magnification - Answer-Objective X eyepiece
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