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BIO 2104 Exam 2 Questions and Complete Solutions Graded A+
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BIO 2104 Exam 2 Questions and Complete Solutions Graded A+
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BIO 2104 Exam 2Questions and
Complete Solutions
Graded A+
Denning [Date] [Course title]
, List and describe three structures common to all bacteria - Answer: Cell wall, Flagella, Fimbriae, Pilus
(Many other examples available)Cell membrane, DNA chromosome, Ribosomes
List and describe four structures found in some bacteria - Answer: Cell wall, Flagella, Fimbriae, Pilus
(Many other examples available)
What are the three general shapes of bacteria - Answer: Cocci, Bacilli, Vibrio
Describe two arrangements found among the general shapes of bacteria - Answer: Staphylo- Strepto-
diplo- or tetrad
True/False: Bacterial fimbriae are used for conjugation - Answer: False
Describe the differences between capsules and biofilms - Answer: Capsules are a protective outer layer
surrounding a singular organism
Biofilms are a protective outer layer made to surround and protect a diverse group of organisms
Pili - Answer: Attachment from one gram-negative bacterial cell to another for conjugation (bacterial
sex) to transfer plasmids. Plasmids are small pieces of DNA with extra traits like antibiotic resistance
Fimbriae - Answer: Fuzzy, small appendage that surrounds the bacterial cell and allows for attachment
to surfaces
Flagella - Answer: Long, tail-like appendage(s) that allow for true motility and, in some cases, attachment
You successfully complete gram staining and your bacteria are all pink/red. What is your gram
stainingresult? What does it tell you about the structure of this bacterial species? - Answer: Gram
Negative Organism (Pink/Red) The bacteria have a thin peptidoglycan layer in their cell wall and an inner
and outer membrane
Gram Positive - Answer: Thick peptidoglycan layer which stains purple. Only an inner cell membrane.
Usually easier to treat due to the thick peptidoglycan layer being easily targeted by antibiotics.
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