Microbio 3

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Which of the following is a characteristic of Lactobacillus bacteria?

Exclusively aerobic with very waxy cell walls

Possess prostheca and can fix nitrogen

Form branching filaments and reproduce by spores

Rod-shaped with no spores, found naturally in the stomach, mouth, intestines, and vagina (correct)

Which feature of Corynebacterium bacteria is described in the text?

They have very waxy cell walls that are resistant to Gram staining

They form branching filaments and reproduce by spores

They reproduce by snapping division, forming V-shapes or palisades (correct)

They are exclusively aerobic and take months to grow on plates

Why are Mycobacterium and Nocardia bacteria difficult to identify using the Gram stain?

They reproduce by snapping division

They form branching filaments and reproduce by spores

They have very waxy cell walls that reject the crystal violet dye (correct)

They are rod-shaped and lack spores

Which of the following is a characteristic of Actinomycetes bacteria?

They form branching filaments and reproduce by spores Signup and view all the answers

Which of the following is a famous member of the Alphaproteobacteria group?

Rhizobium, a nitrogen fixer Signup and view all the answers

What is a key feature of the prostheca structure found in Alphaproteobacteria?

It helps them survive with little nutrients Signup and view all the answers

How do Mycobacterium and Nocardia bacteria differ from other Gram-positive bacteria in terms of staining?

They require the Ziehl-Neelsen acid-fast staining technique Signup and view all the answers

What is the purpose of the nitrogen-fixing ability of Rhizobium bacteria, which are Alphaproteobacteria?

To form root nodules on plants Signup and view all the answers

Which of the following is a key feature of the Actinomycetes group of bacteria?

They are exclusively aerobic and take months to grow on plates Signup and view all the answers

How do Mycobacterium and Nocardia bacteria differ from other Gram-positive bacteria in terms of their cell wall composition?

They have very waxy cell walls that reject the crystal violet dye used in Gram staining Signup and view all the answers

What is the main difference between a communicable disease and a contagious disease?

Communicable diseases can be transmitted indirectly, while contagious diseases require direct contact Signup and view all the answers

Which of the following best describes the term 'prevalence' in epidemiology?

The total number of cases of a disease in a population at a given time Signup and view all the answers

What is the primary focus of hospital epidemiology?

Studying the spread of diseases within hospital settings Signup and view all the answers

Which of the following factors is NOT listed as contributing to nosocomial infections in hospitals?

Poor sanitation practices in the community Signup and view all the answers

What is the primary difference between an acute disease and a subacute disease?

Subacute diseases have a duration and severity in between acute and chronic diseases Signup and view all the answers

What is the primary focus of the field of epidemiology?

Studying the distribution and determinants of diseases within populations Signup and view all the answers

How are epidemics typically identified?

By comparing the actual number of cases to the expected number of cases Signup and view all the answers

What is the primary characteristic of a latent disease?

The pathogen remains inactive for a long period of time Signup and view all the answers

Which of the following statements about non-communicable diseases is true?

They arise from normal microbiota or outside of hosts Signup and view all the answers

What is the primary difference between incidence and prevalence in epidemiology?

Prevalence measures the total number of cases at a given time, while incidence measures new cases over a period Signup and view all the answers