Microbiology Exam Questions with 100% Correct Answers Latest Graded A+

Microbiology Exam Questions with 100% Correct Answers Latest
Graded A+


Question:
Identify 3 components of both gram positive and negative bacteria.
Answer:
-Cell wall


-Capsule

-Plasma cell membrane

Question:
Compare/contrast gram (+) and gram (-) bacteria
Answer:
Gram (+)


Question:
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


Question:
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)

,Question:
Bacterial shapes: Rods (Bacilli)
Answer:
-chain of bacilli


-flagellate rods

-spore former

Question:
Bacterial shapes: Spirals
Answer:
-Vibrios


-Spirilla

-Spirochaetes

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


Question:
Smallest and largest bacteria
Answer:
Smallest:


Mycoplasma

Largest: Bacillus anthracis

Question:
Bacteria is a prokaryote with the following characteristics :
Answer:
-no nucleus or membrane-bound organelles

,-chromosomes and plasmids freely float in cytoplasm

Question:
Function of cells wall
Answer:
• Provides structural


support

• Made of peptidoglycan

(polysaccharide)

Question:
Function of capsule
Answer:
Sticky outer layer


for protection and

attachment

Question:
Function of plasma cell membrane
Answer:
• Directs what enters


and exits

• Phospholipid bilayer

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


Question:
Gram positive bacteria structure

, Answer:
• Inner plasma cell membrane (phospholipid bilayer)


• Thick 'peptidoglycan' cell wall

• Outer Capsule

Question:
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

Question:
Bacteria unlike eukaryotes have no in plasma membrane.
Answer:
sterols


Question:
Lipopolysaccharide (LPS) is only associated with .
Answer:
Gram negative bacteria


Question:
POLLEV- True or false: Gram (-) Bacteria has a thicker peptidoglycan cell wall than the Gram (+)
Bacteria
Answer: