MICROBIOLOTY WEDNESDAY 8/30 Clicker Question The peptidoglycah layer of a gram-positive bacterial căll contains pores in order to facilitate the passing of nutrients in the call wall
A. Pores B. porins C. Active transport proteins
D. Carrier proteins Clicker Question © For gram-positive organisms, the rate of diffusion quross the peptido. glycan layer would be If you want to learn more check out What cancer for females is greatly decreasing in trend in death rate over the last 80+ years?
A. The same as gram-negative
organisms B. Faster than in gram-neg. C. Slow than gram-neg. D. The same for smali
uncharged molectes but slaver for large molewles
relative to gram. neg. Answer is: A
The RATE stays the same Clicker Question 3 Design an antibiotic that would effeštively treat Staphylococcus qureus egram +) Describe mechanism of action We also discuss several other topics like What is the meaning of variety in healthy diet?
• Break glycosidic bonds (sugar bonds)
-Tysozymes, saliva, teařs, mucous We also discuss several other topics like What is the meaning of interphase?
• Break peptide bonds
• Attack Lipotechoic acid (LTA) *This is what researchers do-look at
Structure and deude possible ways
to break it down If you want to learn more check out What is variety in a healthy diet?
dicker quation important main idea
cell surface Features Flagelig -cell motility -Spiral hollow, rigid filaments
that extend from cell surface - Location/# vary between species -Basic components:
1. Filament of flugelin proteins 2. Hook protein portion We also discuss several other topics like What is the direction of magnitude?
-wider at base - connects filament to basal
body 3. Basar body (motor)
-disk-like structure anchoreel in aytoplasmic membrane
and cell wall -generates the torque needed
for mumt. - slightly diff for gram
Calorit need to know details) How this movement ours: If you want to learn more check out The 4 main subdivisions of anthropology are?
motor that is driven by the PROTON
GRADIENT Random munt vs. Directed munt. - most bacteria
-certain types of bact. -Run & tumble
- Taxis: directed
-phototaxis Tumble: clockwise
- Acrotaxis *Athc# of runs vs.
-morens than capsule
tumbles thin covering layer of poly. Saccharides
-AKA:glycocalyx, slime layer
substances (EPS) -gives colonies shiny, wet look - one role: protection from human
phagocytic cells -Prevents dessication - Altachment
capsules - Biofilms 4-Biofilm: group of microorganisms
that stick to each other on a
surface - cells in biofilms are embedekd
with a matrix of EPS Steps in biofilm development
I. Adhere to a surface 2. colonize to attract
other species BIOFILM ACTIVITY . Properties that help biofilmstick to tooth surface?
-EPS layer 2. How does Brushing / flossing chemical physical
properties of biofilm?
-Physical disruption of biofilm -Allows Oz to penetrate to layers
doser to tooth (A MB of microbes) - Washes away acid 3. Benefits vs. Disadvantages of Dental plaque (Biofilm) - Protective covergrowth
barrier a ald-producing
from pathayas bacteria, Taudo - Allows goud in mouth
bacteria to - cavities
- gum disease
due to puthogen
invasion - harder to get ne
a bad bacteria 4. Advantage of living in a biofilm
nutrient waste exchange -attachment to tooth surface
-away from stomach and
"(BH too low) -genetic exchange - Environmental protection -Prevents dessication