MICROBIOLOGY EXAM 2(ACTUAL EXAM)
WITH CORRECT 200+ QUESTIONS AND
ANSWERS LATEST 2024 – 2025 GOOD
SCORE IS GUARANTEED GRADE A+
What identification tests can be performed on a pleomorphic GNB that
only grows on chocolate agar (no growth on blood agar and MAC)? -
ANSWERS-X & V strips/disks or porphyrin test & hemolysis check
What components are included in the Quad plate for identification of
Haemophilus? - ANSWERS-X, V, XV, & horse blood for detection of
hemolysis
Obligatory Intracellular Parasites - ANSWERS-Require livinghost cell in
order to multiply - Such as Viruses.
Defining a Virus - ANSWERS-1) Contains 1 Nucleic Acid (DNA or RNA)
,2) Protein coat surrounds the DNA or RNA
3)Multiply within host using host machinery
---because they don't have the ways of making/obtaining their own
nutrients. like ATP or enzymes.
Are Viruses Living or Nonliving? - ANSWERS-They are only considered
living when they are inside of a host cell, using their resources and
energy.
Outside of a host they are considered intert.
When are Viruses considered to be "alive"? - ANSWERS-When they are
inside of a host cell.
When inside, their nucleic acid (ONLY RNA OR DNA) become active.
*Virus replicates
Virus Characteristics - ANSWERS-*Some are enclosed by an envelope
which consists of lipids, proteins, carbohydrates
,*some have spikes
*only infect the cells of ONE host.
Host Range - ANSWERS-The spectrum of host cells that a virus can
infect.
-invertebrates
-vertebrates
-plants
-protist
-fungi
-bacteria
The virus must be able to attach to a the particular host's cell.
**Host range is determined b specific attachment sites on the host
cell's surface
Bacteriophages - ANSWERS-Bacteria that is infected by a virus
, How do Viruses attach to a host cell - ANSWERS-Through receptors on
the host cell's surface.
There must be an interaction.
Capsid - ANSWERS-Protein coat that surrounds the Nucleic Acid of a
virus. (not the whole virus itself. That's an envelope.)
****Made up of individualized Capsomeres****
*accounts for most of the mass of a viral cell.
Capsomeres - ANSWERS-Protein subunits that make up a capsid
(think of tiny balls that come together to make a huge coating around
the Nucleic Acid)
*capsomeres can be made up of multiple types of proteins or one
single type of protein
Envelope - ANSWERS-Surrounds the virus as a whole.
*Synonymus to a somatic cell's Plasma Membrane. But around a virus.
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