BIO 2104 Exam 2
Questions 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.
Questions 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.
