Quiz 2: Microbes

Name the period of rapid growth in a bacterial culture when the cells divide every few minutes.
1. mitosis
2. replication
3. log phase
4. apoptosis
Which of these must infect a living host to reproduce?
1. bacteria
2. viruses
When provided the proper nutrients, which of these can grow and reproduce on their own without a living host?
1. bacteria
2. viruses
E. coli alternate between “swimming” and “tumbling” behavior by reversing the rotation of what appendages?
1. pili
2. flagella
3. fimbriae
4. capsule
Chemotaxis in E. coli depends on what flagellar characteristic?
1. length
2. thickness
3. rotation
4. number
What bacterial structure does penicillin weaken?
1. nucleosome
2. ribosome
3. endospore
4. cell wall
What do penicillin-resistant bacteria produce that protects them from that antibiotic?
1. capsule
2. pili
3. penicillinase
4. peroxidase
What genus of bacteria has been shown to cause peptic ulcers?
1. Escherichia
2. Helicobacter
3. Salmonella
4. Enterococcus
After passing through the stomach, a cyst of the parasite Cryptosporidium will release how many infective sporozooites(s)?
1. one
2. four
3. twelve
4. over one hundred
Some strains of Streptococcus have a toxin on their surface call streptolysin-s. When a white blood cell attacks these bacteria, what happens?
1. The bacteria paralyze the white cell
2. The bacteria bounce off the white cell
3. The bacteria are killed and the white cell self destructs
4. Nothing: white cells avoid these bacteria

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