Page 47 - MNU microbiology theoritical 2025

General Microbiology & Immunology (PM 401) Second level Semester 4 2024/2025

Q1: Choose the best correct answers in each of the following statements
1- Which of the following transport across membranes requires energy?
a) Facilitated diffusion.
b) Passive diffusion.

c) Osmosis.
d) Active transport

2- What will happen when cell exposed to a hypertonic environment?
a) Cell will gain water

b) Cell will lose water
c) Cell neither gain nor lose water
d) Cell will burst

3- Which of these is exposed on the outer surface of a gram-negative
bacterium?
a) Braun lipoprotein

b) O-antigen of lipopolysaccharide (LPS)
c) Polysaccharide portion of lipoteichoic acid (LTA)
d) Electron transport system components

4- The Gram-positive bacterial cell wall is primarily composed of:

a) Lipids
b) Peptidoglycan
c) Cellulose
d) Cholesterol

General Microbiology & Immunology (PM 401) theoretical handbook Page 36