BIOL 203 MICROBIOLOGY LCC ACTUAL TEST PAPER QUESTIONS AND SOLUTIONS COMPLETE STUDY GUIDE

BIOL 203 MICROBIOLOGY LCC ACTUAL
TEST PAPER QUESTIONS AND SOLUTIONS
COMPLETE STUDY GUIDE

●● Compare/contrast gram (+) and gram (-) bacteria
Answer: Gram (+)
1. thick peptidoglycan
2. small periplasmic space
3. Teichoic acid


Gram (-)
1. THIN peptidoglycan
2. LPS
3. Porins
4. Large periplasmic space


●● Plasmids carry genes for?
Answer: 1. Antibiotic resistance
2. Resistance to heavy metals (Hg, Ag)
3. Resistance to UV light
4. Pili

,5. Exotoxins


●● Bacterial shapes: cocci
Answer: - diplococci (pair)
- streptococci
- tetrad (4)
- staphylococci
- Sarcina (cube of 8)


●● Bacterial shapes: Rods (Bacilli)
Answer: -chain of bacilli
-flagellate rods
-spore former


●● Bacterial shapes: Spirals
Answer: -Vibrios
-Spirilla
-Spirochaetes


●● The shape of a bacterium is determined by its _____.
Answer: rigid cell wall

,●● Smallest and largest bacteria
Answer: Smallest:
Mycoplasma


Largest: Bacillus anthracis


●● Bacteria is a prokaryote with the following characteristics : ______
Answer: -no nucleus or membrane-bound organelles
-chromosomes and plasmids freely float in cytoplasm


●● Function of cells wall
Answer: • Provides structural
support
• Made of peptidoglycan
(polysaccharide)


●● Function of capsule
Answer: Sticky outer layer
for protection and
attachment


●● Function of plasma cell membrane

, Answer: • Directs what enters
and exits
• Phospholipid bilayer


●● Differences in cell walls gram (-) and (+)
Answer:


●● Gram positive bacteria structure
Answer: • Inner plasma cell membrane (phospholipid bilayer)
• Thick 'peptidoglycan' cell wall
• Outer Capsule


●● Gram negative bacteria structure
Answer: • Inner plasma cell membrane
(phospholipid bilayer)
• Thin 'peptidoglycan' cell wall
• Another outer plasma cell
membrane (phospholipid
bilayer - 'lipopolysaccharides')
• Outer Capsule


●● Bacteria unlike eukaryotes have no ____ in plasma membrane.