Micro Virus Infecting Wbc Colonztion Infxn Transmission

15 Questions | By Chachelly | Updated: Mar 21, 2022 | Attempts: 291

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Micro Virus Infecting Wbc Colonztion Infxn Transmission - Quiz

Questions and Answers

1.

The synthesis of viral DNA and capsid assembly of Herpesviridae takes place:
- A.
  
  In the cytoplasm right before the final processing.
- B.
  
  In the nucleus with the final processing of the virion followed in the cytoplasm.
- C.
  
  In the nucleus followed by the final processing in the nucleus
- D.
  
  In the cytoplasm with the final processing in the nucleus.
- E.
  
  Only in the nucleus without any subsequent maturation step.
2.

Identify the virion structure indicated by the arrow:
- A.
  
  The envelope
- B.
  
  The nucleus
- C.
  
  The tegument
- D.
  
  The capsid
- E.
  
  The matrix
3.

The replication cycle and the synthesis of gene products of herpesviruses is tightly regulated:
- A.
  
  Viral gene expression is divided into early and late stages. The early gene products activate the expression of the late genes.
- B.
  
  The replication cycle contains only one step: All genes are expressed at the same time
- C.
  
  Viral gene expression is coordinated regulated and sequentially ordered in a cascade fashion. There are three classes of mRNAs.
- D.
  
  Viral gene expression is divided into four stages. Viral gene expression is coordinated regulated and sequentially ordered in a cascade fashion. There are three classes of mRNAs
- E.
  
  Successful replication cycle of herpesviruses is depending on a helper virus with an early and late stage gene expression.
4.

Herpes viruses engage in host-specific and highly subversive, active strategies to circumvent the hosts’ responses. The virus encodes functions that prolong the metabolic activity of the cell until viral replication is completed. Which of the following events interferes with the host’s responses
- A.
  
  Attachment and entry
- B.
  
  Viral gene expression in a cascade fashion
- C.
  
  DNA-dependent RNA polymerase and reverse transcriptase activity
- D.
  
  Apoptosis
- E.
  
  Expression of a fusion protein
- F.
  
  Latency
5.

Nucleoside analogues are pro-drugs that require phosphorylation before becoming effective. Which of the following is the enzyme associated with acyclovir:
- A.
  
  Thymidine kinase
- B.
  
  Valin kinase
- C.
  
  Tyrosine kinase
- D.
  
  Trypsine kinase
- E.
  
  Integrase
6.

Which of the following tumors is caused by a virus other than Epstein-Barr virus?
- A.
  
  Posttransplant lymphoma
- B.
  
  Hodgkin’s Disease
- C.
  
  Kaposi’s Sarcoma
- D.
  
  Burkitt’s lymphoma
- E.
  
  Nasopharyngeal carcinoma
7.

A 26-year old woman visits her physician because of an unusual vaginal discharge. On examination the physician observes a thin, homogeneous, white-gray discharge that adheres to the vaginal wall. The pH of the discharge is 5.5 (normal: < 4.3). Bacterial vaginosis is diagnosed. Which one of the following normal genital flora microorganisms is present in greatly decreased numbers in bacterial vaginosis?
- A.
  
  Corynebacterium species
- B.
  
  Staphylococcus epidermidis
- C.
  
  Prevotella species
- D.
  
  Candida albicans
- E.
  
  Lactobacillus species
8.

Certain microorganisms are never considered to be members of the normal flora. They are always considered to be pathogens. Which one of the following organisms fits into that category?
- A.
  
  Streptococcus pneumoniae
- B.
  
  Escherichia coli
- C.
  
  Mycobacterium tuberculosis
- D.
  
  Staphylococcus aureus
- E.
  
  Neisseria meningitidis
9.

Which one of the following microorganisms is closely associated with dental caries?
- A.
  
  Candida albicans
- B.
  
  Streptococcus mutans
- C.
  
  Prevotella melaninogenica
- D.
  
  Neisseria subflava
- E.
  
  Staphylococcus epidermidis
10.

Neither profuse sweating nor washing and bathing can eliminate or significantly modify the normal microbial flora on our skin. Which are the factors that may be important in eliminating nonresident microorganisms from the skin? (Several answers possible)
- A.
  
  Low pH
- B.
  
  Low salt concentration
- C.
  
  Fatty acids in sebaceous secretions
- D.
  
  Absence of enzymes
- E.
  
  Moisture
11.

The primary effect of lactobacilli in the adult vagina is to
- A.
  
  Maintain an alkaline environment
- B.
  
  Maintain an acidic environment
- C.
  
  Produce a productive mucus layer
- D.
  
  Increase fertility
- E.
  
  Keep the menstrual cycle regular
12.

Which of the following is NOT an example of symbiosis?
- A.
  
  Bacteria in the human colon
- B.
  
  Tapeworm in the human intestine
- C.
  
  Protozoa in termites
- D.
  
  Protozoa in the rumen of cattle
- E.
  
  Microbes in a sewage plant
13.

Resident microbiota are found in all of the following locations in the body EXCEPT:
- A.
  
  The lower digestive tract
- B.
  
  The lower respiratory tract
- C.
  
  The upper digestive tract
- D.
  
  The urinary system
- E.
  
  The stomach
14.

Normal microbiota are first acquired during
- A.
  
  During birth
- B.
  
  After one year of age
- C.
  
  By age five
- D.
  
  During the first month
- E.
  
  At age eighteen
15.

Which of the following is a mechanical vector:
- A.
  
  Housefly
- B.
  
  Cockroach
- C.
  
  Table
- D.
  
  Both A and B are correct
- E.
  
  Both A and C are correct