Microbiology NBDE part 1 Exam
2025 Questions and Answers
T/F Exotoxins are heat labile? - ANSWER✔✔-True
T/F Endotoxins are heat labile? - ANSWER✔✔-False
They are heat stabile
T/F Endotoxins are proteins? - ANSWER✔✔-False
Endotoxins are lipopolysaccharides
T/F Gram positive produce endotoxins? - ANSWER✔✔-False- only Gram -
T/F Gram - produces exotoxins? - ANSWER✔✔-True both Gram + and negative
produces exotoxins
Gram - also produces endotoxins
What bacteria does not have a cell wall? - ANSWER✔✔-Mycoplasm ( including
ureoplasm)
, What bacteria has a cell wall that lacks muramic acid? - ANSWER✔✔-Chlamydia
What bacterias are resistant to Beta- lactam? - ANSWER✔✔-Chlamydia and mycoplasm
What bacterium is Acid-fast staining? - ANSWER✔✔-Mycobacteria and Nocardia
- The ability to resist acid decolorization due to high content of waxes. in the cell wall.
What organelle is responsible for movement? - ANSWER✔✔-Flagella
What organelle is responsible for attachement? Which bacterium has them? -
ANSWER✔✔-Pili or fimbriae
Gram - bacterium
Does prokaryitc flagella has microtubules? - ANSWER✔✔-No
What bacterium have spores? - ANSWER✔✔-Bacillus and chlostridium
The DNA type in prokarytes is lineal or circular? - ANSWER✔✔-circular
Which one is prokaryotic?
Fungi
Bacterium
Virus
Parasites - ANSWER✔✔-Bacterium
2025 Questions and Answers
T/F Exotoxins are heat labile? - ANSWER✔✔-True
T/F Endotoxins are heat labile? - ANSWER✔✔-False
They are heat stabile
T/F Endotoxins are proteins? - ANSWER✔✔-False
Endotoxins are lipopolysaccharides
T/F Gram positive produce endotoxins? - ANSWER✔✔-False- only Gram -
T/F Gram - produces exotoxins? - ANSWER✔✔-True both Gram + and negative
produces exotoxins
Gram - also produces endotoxins
What bacteria does not have a cell wall? - ANSWER✔✔-Mycoplasm ( including
ureoplasm)
, What bacteria has a cell wall that lacks muramic acid? - ANSWER✔✔-Chlamydia
What bacterias are resistant to Beta- lactam? - ANSWER✔✔-Chlamydia and mycoplasm
What bacterium is Acid-fast staining? - ANSWER✔✔-Mycobacteria and Nocardia
- The ability to resist acid decolorization due to high content of waxes. in the cell wall.
What organelle is responsible for movement? - ANSWER✔✔-Flagella
What organelle is responsible for attachement? Which bacterium has them? -
ANSWER✔✔-Pili or fimbriae
Gram - bacterium
Does prokaryitc flagella has microtubules? - ANSWER✔✔-No
What bacterium have spores? - ANSWER✔✔-Bacillus and chlostridium
The DNA type in prokarytes is lineal or circular? - ANSWER✔✔-circular
Which one is prokaryotic?
Fungi
Bacterium
Virus
Parasites - ANSWER✔✔-Bacterium