Microbiology Exam Prep V3

22 Questions | By Jaymunro | Updated: Mar 22, 2022 | Attempts: 4417

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Microbiology ese prep v3

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1.

Which of the following is not true about spikes?
- A.
  
  They are used for absorption
- B.
  
  They are used for penetration
- C.
  
  They may cause haemagglutination
- D.
  
  They are only found on enveloped viruses
2.

The ability of a virus to infect an organism is regulated by
- A.
  
  The host species
- B.
  
  The type of cells
- C.
  
  The availability of an attachment site
- D.
  
  Cell factors necessary for replication
- E.
  
  All of the above
3.

Which of the following statements is not true?
- A.
  
  Viruses contain DNA or RNA
- B.
  
  The nucleic acid of a virus is surrounded by a protein coat
- C.
  
  Viruses multiply inside living cells using viral mRNA, tRNA and ribosomes
- D.
  
  Viruses cause the synthesis of specialised infectious elements
- E.
  
  Viruses multiply inside living cells
4.

A viroid is
- A.
  
  A complete infectious virus particle
- B.
  
  A naked infectious piece of RNA
- C.
  
  A capsid without any nucleic acid
5.

An enveloped virus acquires its envelope during _____________
- A.
  
  Penetration
- B.
  
  Adsoprtion
- C.
  
  Uncoating
- D.
  
  Release
6.

The most conclusive evidence that viruses cause cancers is provided by
- A.
  
  Finding oncogenes in viruses
- B.
  
  The presence of antibodies against viruses in cancer patients
- C.
  
  Cancer following the injection of cell-free filtrates
- D.
  
  Treating cancer with antibodies
- E.
  
  Some liver cancer patients having had hepatitis
7.

Generally, in a DNA-virus infection, the host animal cell supplies all of the following except
- A.
  
  RNA polymerase
- B.
  
  Nucleotides
- C.
  
  DNA polymerase
- D.
  
  TRNA
- E.
  
  None of the above
8.

Which of the following is most useful in determining whether two organisms are related?
- A.
  
  If both ferment lactose
- B.
  
  If both are gram-positive
- C.
  
  If both are motile
- D.
  
  If both are aerobic
- E.
  
  All are equally important
9.

Into which group would you place a photosynthetic cell that lacks a nucleus?
- A.
  
  Animalia
- B.
  
  Bacteria
- C.
  
  Fungi
- D.
  
  Plantae
10.

Which of the following is a characteristic of Clostridium?
- A.
  
  Endospore-forming cocci
- B.
  
  Mycobacteria
- C.
  
  Gram-negative aerobic cocci
- D.
  
  Anaerobic gram-negative rods
- E.
  
  None of the above
11.

Which of the following do you expect to be most resistant to high temperatures?
- A.
  
  Bacillus subtilis
- B.
  
  Eschericia coli
- C.
  
  Neisseria gonorrhoeae
- D.
  
  Staphylococcus aureus
- E.
  
  Streptococcus pyogenes
12.

Which of the following lacks a cell wall?
- A.
  
  Eschericia
- B.
  
  Mycoplasma
- C.
  
  Mycobacterium
- D.
  
  Clostridium
- E.
  
  Streptococcus
13.

Rickettsias differ from chlamydias in that rickettsias
- A.
  
  Are gram-negative
- B.
  
  Are intracellular parasites
- C.
  
  Require an arthropod for transmission
- D.
  
  All of the above
- E.
  
  None of the above
14.

Chemotaxis implies that bacteria:
- A.
  
  Move towards an attractant
- B.
  
  Move away from a repellant
- C.
  
  Both a and b
- D.
  
  Neither a nor b
15.

The best definition of HUMORAL immunity is:
- A.
  
  Immunity involving soluble antibodies
- B.
  
  Immunity involving STEM CELLS
- C.
  
  Immunity involving the lymphatics system
- D.
  
  Immunity involving T cells
- E.
  
  Immunity involving platelets
16.

The most common type of antibody in the serum is:
- A.
  
  IgG
- B.
  
  IgE
- C.
  
  IgM
- D.
  
  IgA
- E.
  
  IgD
17.

Each antibody has THREE binding sites, one at the end of each arm of the "Y"
- A.
  
  True
- B.
  
  False
18.

Each antigen-binding site of an antibody molecule is composed of:
- A.
  
  The Fc domain
- B.
  
  The light chains
- C.
  
  The variable domains of one light and one heavy chain
- D.
  
  The constant domains of one light and one heavy chain
- E.
  
  The variable domains of two light chains
19.

Antigenic peptides that are presented by antigen presenting cells are called:
- A.
  
  Fc fragments
- B.
  
  Secretory fragments
- C.
  
  Epitopes
- D.
  
  Antibodies
20.

An important characteristic of IgA is:
- A.
  
  It is found in secretions
- B.
  
  It can cross the placenta
- C.
  
  It is the first Ab secreted in response to antigen stimulation
- D.
  
  All of the above
21.

The secondary immune resonse
- A.
  
  Display a more rapid onset than primary responses
- B.
  
  Reach higher maximum levels than primary responses
- C.
  
  Display a more acute rise (steeper slope) in immune activity over time than primary resonses
- D.
  
  Will often prevent disease
- E.
  
  All of the above
22.

Opsonisation
- A.
  
  Is mediated by the interaction of antibodies with the Fc receptors on phagocytes
- B.
  
  Results in more efficient ingestion of antigen by phagocytes
- C.
  
  Is important in resisting and/or fighting many bacterial infections
- D.
  
  Is particularly well-mediated by several of IgG
- E.
  
  All of the above