Which of the following is not one of the conditions that mus

Which of the following is not one of the conditions that must be met to fulfill Koch\'s postulate? The suspected causative agent must be found in every case of the disease and be absent from healthy hosts. The agent must be isolated and grown outside the host. The agent must produce a toxin both in and outside the host. When the agent is introduced to a healthy, susceptible host, the host must get the disease. Which of the following plays the biggest role in determining if a cell will retain its crystal violet -iodine complex even after detaining in the Gram stain procedure? Whether or not a cell contains a lipopolysaccharide (IPS) outer membrane. The thickness and composition of the peptidoglycan layer. The efficiency of antiparty proteins that the cell possesses. All of the above play a direct role in color obtained during a Gram stain. Which of the following would result in a tumble with respect to bacteria motility? Deposition of glycol calyces. Rotation of flagella clockwise. Rotation of flagella counterclockwise. Stopping flagella rotation all together. Endospore formation in a vegetative cell relies on or carries out all but which of the following? Calcium deposition. Invagination of the cytoplasmic membrane. Generation of new extensive cell wall material, Copying of the bacterial chromosome. Which is the shortest? Flagella Pile Fimbriae Which of the following cells should you least expect to contain an electron transport chain? Strict aerobes. Strict anaerobes. Facultative anaerobes. Answers B and C. True (bubble A) or False (bubble B): Microorganisms can\'t tolerate the low pH of the human stomach.

Solution

1. The agent must produce a toxin both inside and outside a host is not a condition to be follwed for Koch postulates.

four Koch postulates are as follows:

i) the microorganism must be present in all cases of the disease. ii)the pathogen can be isolated from the diseased host and grown in pure culture. iii) the pathogen from the pure culture must again cause the same disease when inoculated into a healthy host. iv) the pathogen must be reisolated from the new host

2. the thickness and composition of the peptidoglycan layer plays a major role in retaining he crystal violet iodine complex in the cell wall.In Gram positive bacteria there are lots of cross linked teichoic acid and dye iodine complex cannot get physically out.

3.Rotation of the flagella clockwise results in tumble.

4.Endospore formation does not involve copying of the bacterial chromosome.

5.Fimbriae are the shortest among pilli ,flagella and fimbriae.

6.obligate anaerobes and facultaive anaerobes are least likely to conatin electron transport chain.

7. true. pareital cells of the stomach produce highly acidic gastic juice below pH 3 to ensure that the microorganisms dont grow.