72) Which stage of an acute infectious diseasccus ben the lime the orgamism begi

Question

72) Which stage of an acute infectious diseasccus ben the lime the orgamism begin i gow in the host and the appearance of disease symptoms? N intection B) acute period D) incubation period decline period 73) Agents that kill bacteria are said to be A) bacteriostatic C) bacteriocidal, D) all of the above 4) The complete elimination of all microorganisms, including viruses, is called A) sterilization B) decontaminatio C) disinfection D) any of the above, depending on the circumstances 75) The thermal death time is the A) measure of the radiation energy output from a source B) time it takes to kill all cells at a given temperature C) dose of radiation necessary for a tenfold reduction in the numbers of selected microorganisms D) time required for a tenfold reduction in the population density at a given temperature salts are commonly added to manicipal 76) To control tooth decay in developed countries, drinking water and toothpastes D) iron C) sodium A) lead 77) Capsules are particularly important for A) making bacteria less pathogenic B) protecting bacteria from host detenso mechanisms C) making bacteria more vulnerable to host defense mechanisms. D) all of the above B) Streptococcus mutans. D) Streptococcus lactis 78) The causative agent of streptococcal pharyngitis, also known as "strep throat, is A) Strepfococcus petmoie C) Strepfococcs pyogenes B) a cell-surface protein receptor for HIV D) all of the above 79) The CD4 molecule is A) found only on T-helper cells O) an FIIV surface glycoprotein Streptococcus prieumontae D) Streptococcus pyogenies 80) The presence of gram-positive diplococci in a sputum sample most likely indicates an infection of A) Bordetella pertussis C) Corynebacterium diphtheriae. D) nucleus 81) Bacteria stain as gram-positive or gram-negative because of ditterences in the cell C) chromosome. A) wall B) cytoplasm.

Explanation / Answer

Question 72

Answer C (Incubation period)

The period between the organism begins to grow in the host and the appearance of disease symptoms is called Incubation period.

Question 73

Answer is C (Bacteriocidal)

The agents killing bacteria are called bacteriocidal.

The agents which prevent the growth of bacteria are called Bacteriostatic.

Question 74

Answer A (Sterilization)

The complete elimination of microorganisms including viruses is called sterilization.

Decontamination means preventing from occurance of contamination.

Disinfectant means the destruction of bacteria or removal of bacteria but it does not eliminate viruses.

Question 75

Answer B

the time required to kill all cells in the culture at given temperature is called thermal death time.

Question 76.

Answer B (Fluoride)

The fluoride provide protection in different ways

i. it makes the teeth resistant to decay

ii. it has antibacterial activity

iii. it provides remineralization of teeth.

Question 77

Answer B

It protects the bacteria from host defensive mechanism. The capsule is the outer membrane of the cell and covers the cell wall. it is somewhat hard material.

Question 78

Answer C

The causative agent of streptococcal pharyngitis is Streptococcus pyogenes.

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