Microbiology Multiple Choice Questions Flashcards by Kévin Pontonnier

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

Robert Koch proved that microorganisms caused disease.

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Which of the following statements concerning taxonomy is correct?

The system uses a binomial designation.

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The following statements about bacteria are correct except:

They posses Golgi apparatus

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Bacteria cell envelope functions include:

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

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Which one of the following statements is correct?

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

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

Can be a source of nutrients & energy

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Which of the following statements regarding flagella is correct?

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

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Regarding bacterial structure is correct that:

Fimbriae are used for the surface attachment of the bacteria.

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Which of the following statements regarding plasmids is correct?

All previous answers are correct

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Which of the following statements regarding endospores is not correct?

All types of bacteria have the ability to form endospores.

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Which of the following statements regarding bacterial growth is correct?

During logarithmic phase bacteria divide exponentially.

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

Leifson staining is used to identify flagella.

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The following picture corresponds to the bacterial shape:

Streptococci

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Regarding oxygen growth requirements it is correct that:

Obligate anaerobes cannot use 02 to grow.

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Virulence factors of bacteria include:

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

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

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

Axial filaments

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Regarding Viridans streptococci it is correct that:

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

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Which of the following statements is true…

S.pyogenes can cause pharyngitis.

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

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

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Staphylococcus genus May cause;

Pyogenes infections; dental abscess

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Regarding gram positive bacteria it is correct that:

Bacillus genus is used as a biological indicator for steam sterilization

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

Veillonella spp is a caryogenic microorganism

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Which of the following statements about viruses is correct?

Viruses are non-cellular organisms.

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All viruses possess:

A genome and a capsid

Which of the following statements about viral spikes is correct?

Attach specifically top host cell receptors.

Regarding viral replication it is correct that:

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

Diagnosis of viral infections cannot Ben performed by:

Growth of the virus in agar culture media.

Regarding human (herpes viruses) it is correct that:

Produce (latent) infections

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

All of them are caused by human herpes viruses.

Which of the following statements about hepatitis is correct?

No effective vaccine is available for hepatitis C and E.

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

No available vaccine.

Which of the following statements about HIV is correct?

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

Predisposing factors for candida infections do not include:

All of them are predisposing factors for candida infections.

It is a characteristic of dimorphic fungi that:

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

Innate immune mechanisms do not include:

Antibodies.

Characteristics of the acquired immunity do not include:

Inflammation

Regarding the acquired immunity, it is correct that:

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

Functions of antibodies do not include:

Direct damage of antigen by binding.

Which of the following statements on vaccines is correct?

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

Regarding antibacterial mechanisms of action it is not correct that:

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

Regarding antibacterial mechanisms of action it is not correct that:

Tetracyclines are commonly used to treat odontogenic infections.

All of the following are classes of antiviral drugs except:

DNAase inhibitors

Regarding non-HIV antivirals it is not correct that:

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

Regarding antifungals it is correct that:

Imidazoles are widely used for the treatment of oral candidiasis

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

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

Regarding syphilis it is not correct that:

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

Regarding gonorrhoea it is correct that:

Intraoral signs are not specific for the diagnosis of gonorrhoea.

Regarding the aetiology of acute meningitis it is correct that:

Neisseria meningitidis is the most common cause of bacterial meningitis.

Regarding the upper respiratory tract infections it is correct that:

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

Regarding sinusitis it is correct that:

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

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

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

Which of the following statements about pneumonia is correct?

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

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

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

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

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

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

Microorganisms o the supragingival dental plaque mainly ferment carbohydrates.

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

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

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

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

Defense mechanism of the mouth include:

All of them (saliva; gingival crevicular fluid)

Regarding the functions of saliva it is not correct that:

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

Which of the following statements regarding saliva is not correct?

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

With regard to dental caries it is not correct that:

The most carcinogenic sugar is fructose.

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

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

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

All of the previous statements are correct.