1. Which of the following statements can characterize the most of Shigella sp.? They are: 1. gram-negative rods 2. glucose-positive 3. facultative anaerobes 4. motile 2. Which of the following are the biochemical features of S. typhi? They are: 1. lactose-negative H_(2)S-positive 3. glucose-positive 4. oxidase-positive 3. Which of the following are the main features of Bordetella pertussis? They: 1. require the presence of absorbents in culture media 2. invade human body through respiratory droplets 3. are bacteria 4. are psychrophiles

1. The correct answer is 1. gram-negative rods, 3. facultative anaerobes. Shigella sp. are gram-negative rods and facultative anaerobes. They are non-motile and do not ferment glucose.<br />2. The correct answer is 1. lactose-negative, 2. H2S-positive, 3. glucose-positive. S. typhi is lactose-negative, H2S-positive, and glucose-positive.<br />3. The correct answer is 1. require the presence of absorbents in culture media, 2. invade human body through respiratory droplets, 3. are bacteria. Bordetella pertussis requires the presence of absorbents in culture media, invades the human body through respiratory droplets, and is a type of bacteria. They are not psychrophiles.