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Microbilogy Semester 2 > Microbiology Multiple Choice Questions > Flashcards

Microbiology Multiple Choice Questions Flashcards

1
Q

Which of the following statements regarding the history of (microbiology) is correct?

A

Robert Koch proved that microorganisms caused disease.

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2
Q

Which of the following statements concerning taxonomy is correct?

A

The system uses a binomial designation.

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3
Q

The following statements about bacteria are correct except:

A

They posses Golgi apparatus

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4
Q

Bacteria cell envelope functions include:

A

All are correct (rigidity & shape; protection against host defenses; supports flagella & fimbriae)

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5
Q

Which one of the following statements is correct?

A

The lipopolysaccharide is a component of the cell wall of (Gram -) bacteria.

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6
Q

Which of the following statements about the function of the bacterial capsule is correct?

A

Can be a source of nutrients & energy

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7
Q

Which of the following statements regarding flagella is correct?

A

In peritrichous bacteria flagella are arranged over the whole cell (surface).

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8
Q

Regarding bacterial structure is correct that:

A

Fimbriae are used for the surface attachment of the bacteria.

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9
Q

Which of the following statements regarding plasmids is correct?

A

All previous answers are correct

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10
Q

Which of the following statements regarding endospores is not correct?

A

All types of bacteria have the ability to form endospores.

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11
Q

Which of the following statements regarding bacterial growth is correct?

A

During logarithmic phase bacteria divide exponentially.

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12
Q

Which of the following statements about bacterial staining methods is correct?

A

Leifson staining is used to identify flagella.

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13
Q

The following picture corresponds to the bacterial shape:

A

Streptococci

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14
Q

Regarding oxygen growth requirements it is correct that:

A

Obligate anaerobes cannot use 02 to grow.

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15
Q

Virulence factors of bacteria include:

A

All of them (Capsule, structural proteins of the cell wall; exotoxins)

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16
Q

Question about gram staining of S.mutans and gingival is bacterium.

A

C

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17
Q

All of the following (participate in the adherence of bacteria to surfaces except:

A

Axial filaments

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18
Q

Regarding Viridans streptococci it is correct that:

A

S.mutans is the only species of the Viridans group that cause dental caries.

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19
Q

Which of the following statements is true…

A

S.pyogenes can cause pharyngitis.

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20
Q

Which one of the following virulence factors of streptococcus (…) caryogenic ability?

A

Water soluble and insoluble extracellular proteins… mutans from sucrose help in attachment… surfaces.

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21
Q

Staphylococcus genus May cause;

A

Pyogenes infections; dental abscess

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22
Q

Regarding gram positive bacteria it is correct that:

A

Bacillus genus is used as a biological indicator for steam sterilization

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23
Q

Which of the following statements about gram negative bacteria is (not) correct?

A

Veillonella spp is a caryogenic microorganism

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24
Q

Which of the following statements about viruses is correct?

A

Viruses are non-cellular organisms.

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25
Q

All viruses possess:

A

A genome and a capsid

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26
Q

Which of the following statements about viral spikes is correct?

A

Attach specifically top host cell receptors.

27
Q

Regarding viral replication it is correct that:

A

In viruses containing DNA, mRNA can be formed using the host cell RNA polymerase to transcribe directly from the viral DNA.

28
Q

Diagnosis of viral infections cannot Ben performed by:

A

Growth of the virus in agar culture media.

29
Q

Regarding human (herpes viruses) it is correct that:

A

Produce (latent) infections

30
Q

Which of the following diseases is not caused by a human herpes virus?

A

All of them are caused by human herpes viruses.

31
Q

Which of the following statements about hepatitis is correct?

A

No effective vaccine is available for hepatitis C and E.

32
Q

Which one of the following statements is not a characteristic of (…)

A

No available vaccine.

33
Q

Which of the following statements about HIV is correct?

A

Oral candidiasis is the most prevalent and significant oral infection (…) with HIV.

34
Q

Predisposing factors for candida infections do not include:

A

All of them are predisposing factors for candida infections.

35
Q

It is a characteristic of dimorphic fungi that:

A

The (mould?) form appears in the environment, the yeast form in the tissue.

36
Q

Innate immune mechanisms do not include:

A

Antibodies.

37
Q

Characteristics of the acquired immunity do not include:

A

Inflammation

38
Q

Regarding the acquired immunity, it is correct that:

A

T(cells) recognize antigens through a surface molecule (…) (TCR)

39
Q

Functions of antibodies do not include:

A

Direct damage of antigen by binding.

40
Q

Which of the following statements on vaccines is correct?

A

Active (immunization) may take several months before the individual (becomes…) protected against the infective agent.

41
Q

Regarding antibacterial mechanisms of action it is not correct that:

A

They are used for the treatment of infections caused by gram-negative (…) bacteria.

42
Q

Regarding antibacterial mechanisms of action it is not correct that:

A

Tetracyclines are commonly used to treat odontogenic infections.

43
Q

All of the following are classes of antiviral drugs except:

A

DNAase inhibitors

44
Q

Regarding non-HIV antivirals it is not correct that:

A

Neuroaminidase inhibitors are used for the treatment (…) C.

45
Q

Regarding antifungals it is correct that:

A

Imidazoles are widely used for the treatment of oral candidiasis

46
Q

One of the most common bacteria that causes infections of the skin and (…) is:

A

Answers A and C are correct (streptococcus pneumoniae and staphylococcus aureus)

47
Q

Regarding syphilis it is not correct that:

A

T.Pallidum can be isolated by culture in Thayer-Martin agar

48
Q

Regarding gonorrhoea it is correct that:

A

Intraoral signs are not specific for the diagnosis of gonorrhoea.

49
Q

Regarding the aetiology of acute meningitis it is correct that:

A

Neisseria meningitidis is the most common cause of bacterial meningitis.

50
Q

Regarding the upper respiratory tract infections it is correct that:

A

It is highly recommended to change the toothbrush and change after (…) due to the persistence of bacteria on them.

51
Q

Regarding sinusitis it is correct that:

A

Sinusitis of odontogenic origin may appear after dental extractions or alveolar (trauma)

52
Q

The mechanism of defense in the upper respiratory tract do not include:

A

All of them are mechanisms of defense of the upper-respiratory tract (mechanical washing; cough;…)

53
Q

Which of the following statements about pneumonia is correct?

A

Pneumococcal pneumonia can be diagnosed by culture of the sample onto blood agar.

54
Q

Which one of the following statements on infective endocarditis is correct?

A

Patients with prosthetic heart valves have a higher risk of endocarditis.

55
Q

Regarding bacteremia, sepsis and septic shock it is not correct that:

A

Septic shock occurs when sepsis leads to dangerously high blood pressure (…) and abnormalities in cellular metabolism.

56
Q

Which one of the following statements is correct regarding oral microflora?

A

Microorganisms o the supragingival dental plaque mainly ferment carbohydrates.

57
Q

Which on of the following statements is correct regarding the (…) oral microflora?

A

S.mutans will begin to be detected mainly between the (…) the appearance of the permanent molars.

58
Q

With regards to dental plaque formation which one of the following statements is correct?

A

During the stage of colonisation and biofilm formation Fusobacterium (…) and Prevotella spp increase in number.

59
Q

Defense mechanism of the mouth include:

A

All of them (saliva; gingival crevicular fluid)

60
Q

Regarding the functions of saliva it is not correct that:

A

Saliva has a high (content) of acids that prevents enamel demineralization.

61
Q

Which of the following statements regarding saliva is not correct?

A

The most important salivary (immune) mechanism is secretary IgG.

62
Q

With regard to dental caries it is not correct that:

A

The most carcinogenic sugar is fructose.

63
Q

All of the following statements about the aetiology of dental caries (…):

A

Lactobacillus spp are involved in the initiation of enamel (…)

64
Q

With regard to the prevention of dental caries, which of the following (statements) is correct?

A

All of the previous statements are correct.

Microbilogy Semester 2 (2 decks)

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