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 consist of secreted material lying outside of the bacterial cell wall
B.   they help bacteria resist phagocytosis by macrophages
C.   they are required for all bacteria to grow normally in culture
D.   they can prevent desiccation of bacteria cells
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.   phagocytosis
C.   DNA replication
D.   ATP production
E.   protein synthesis
Question #3
Fimbriae:
A.   sense changes in nutrient concentration
B.   attach bacteria to various surfaces
C.   cause bacteria move through fluids
D.   are pathways for the secretion of exoenzymes
Question #4
Brushing teeth is important to biofilm prevention. What specific bacterial structure does brushing teeth address?
A.   fimbriae
B.   flagella
C.   endospores
D.   capsules
Question #5
Plasmids are important to the genetics of many bacteria. This is because:
A.   they are inherited from one generation to the next and they may carry genes that give their host a selective advantage
B.   they may carry genes that give their host a selective advantage
C.   they can render bacteria drug-resistant
D.   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
Question #6
Which of the following is NOT found in bacteria?
A.   cell wall
B.   plasma membrane
C.   membrane bound nucleus
D.   ribosome
Question #7
What is the purpose of bacterial endospores?
A.   allow the bacterium to make hundreds of "seeds" to spread on the wind
B.   allow the bacterium to survive extended periods without nutrients
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 a eukaryote
B.   it is part of a multicellular microorganisms
C.   it is gram positive
D.   it contains some peptidoglycan
E.   it contains mitochondria
Question #9
A bacillus bacterium with a single flagellum at each end is described as:
A.   amphitrichous
B.   monotrichous
C.   peritrichous
D.   lophotrichous
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.   actively block water molecules from entering the cell
C.   are selectively permeable
D.   contain a cell wall composed of peptidoglycan
Question #11
Choose the term below, that BEST completes the following statement. As magnification increases, the contrast:
A.   stays the same
B.   increases
C.   decreases
Question #12
Why is it important to flame the test tubes before and after transferring bacteria into fresh, sterile culture media?
A.   clean the tube for use in the future
B.   prevent contaminating the second culture tube
C.   more than one of the above is correct
D.   to seal the plastic lid on the tube
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.   the bacteria spread through each sector during incubation
B.   they left the top of the Petri open too long during making the streak
C.   the tryptic soy agar plate was contaminated prior to making the streak
D.   they returned the flame loop to the broth between every sector/quadrant
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 focus above or below a stained specimen
C.   the distance between the end of the microscope objective lens and the specimen slide
D.   the ability to distinguish two small objects as separate

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