Bio 2010 - Microbiology » Summer 2021 » Chapter 3 Quiz (B)

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Question #1
Which of the following is not true about capsules and slime layers?
A.   they are required for all bacteria to grow normally in culture
B.   they help bacteria resist phagocytosis by macrophages
C.   they can prevent desiccation of bacteria cells
D.   they consist of secreted material lying outside of the bacterial cell wall
Question #2
The use of the antibiotics that inhibit or inactivate cellular ribosomes will result directly in the loss of which of the following functions:
A.   cell division
B.   ATP production
C.   DNA replication
D.   phagocytosis
E.   protein synthesis
Question #3
Fimbriae:
A.   sense changes in nutrient concentration
B.   are pathways for the secretion of exoenzymes
C.   attach bacteria to various surfaces
D.   cause bacteria move through fluids
Question #4
Brushing teeth is important to biofilm prevention. What specific bacterial structure does brushing teeth address?
A.   fimbriae
B.   capsules
C.   flagella
D.   endospores
Question #5
Plasmids are important to the genetics of many bacteria. This is because:
A.   they may carry genes that give their host a selective advantage
B.   they are inherited from one generation to the next and they may carry genes that give their host a selective advantage
C.   they are inherited from one generation to the next, they may carry genes that give their host a selective advantage, and they can render bacteria drug-resistant
D.   they can render bacteria drug-resistant
Question #6
Which of the following is NOT found in bacteria?
A.   membrane bound nucleus
B.   cell wall
C.   ribosome
D.   plasma membrane
Question #7
What is the purpose of bacterial endospores?
A.   allow the bacterium to survive extended periods without nutrients
B.   allow the bacterium to make hundreds of "seeds" to spread on the wind
C.   help the bacterium to differentiate into faster growing stages of bacteria
D.   allow the bacterium to survive the absence of oxygen
Question #8
While viewing the soil sample under the microscope you will notice a rod- shaped cell devoid of a nucleus. The only correct assumption that can be made of the cell thus far is that:
A.   it is part of a multicellular microorganisms
B.   it contains mitochondria
C.   it is a eukaryote
D.   it is gram positive
E.   it contains some peptidoglycan
Question #9
A bacillus bacterium with a single flagellum at each end is described as:
A.   lophotrichous
B.   amphitrichous
C.   monotrichous
D.   peritrichous
Question #10
The reason that bacterial cells are more resistant to osmotic shock than are eukaryotic cells is that they:
A.   contain a cell wall composed of cellulose
B.   are selectively permeable
C.   contain a cell wall composed of peptidoglycan
D.   actively block water molecules from entering the cell
Question #11
Choose the term below, that BEST completes the following statement. As magnification increases, the contrast:
A.   stays the same
B.   decreases
C.   increases
Question #12
Why is it important to flame the test tubes before and after transferring bacteria into fresh, sterile culture media?
A.   more than one of the above is correct
B.   prevent contaminating the second culture tube
C.   to seal the plastic lid on the tube
D.   clean the tube for use in the future
E.   none of the above is correct
Question #13
After making and incubating your Streak-for-Isolation plate a student notices that they have confluent growth in EVERY sector/quadrant. Which of the following most likely explains what happened?
A.   they left the top of the Petri open too long during making the streak
B.   the bacteria spread through each sector during incubation
C.   they returned the flame loop to the broth between every sector/quadrant
D.   the tryptic soy agar plate was contaminated prior to making the streak
Question #14
Which of the following choices is the BEST definition of depth-of-field?
A.   the image that one sees when looking through the oculars
B.   the ability to distinguish two small objects as separate
C.   the distance between the end of the microscope objective lens and the specimen slide
D.   the ability to focus above or below a stained specimen

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