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Micro Bio 120 Exam 1 Questions and Answers (100% Pass)
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Micro Bio 120 Exam 1 Questions and Answers (100% Pass)
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©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PMMicro Bio 120 Exam 1 Questions and Answers (100% Pass)
True or False:
The plasma membrane and most other membranes are composed of a lipid bi-layer in
which integral proteins are buried. - ✔️✔️True
True or False:
Procaryotic cells are usually smaller than eucaryotic cells. - ✔️✔️True
True or False:
Most procaryotes have strong cell walls that give them shape. - ✔️✔️True
The significance of the plasma membrane is that:
A) It selectively allows some molecules to pass into the organism
B) It prevents movement of molecules out of the organism
C) It is the site of protein synthesis
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,©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PM
D) All of the above - ✔️✔️D, all of the above
The most commonly encountered bacteria are roughly spherical. The microbiological
term describing this shape is:
A) Coccus
B) Bacillus
C) Pleomorphic - ✔️✔️A, coccus
In bacterial cells, ribosomes are packed into the cytoplasmic matrix and also loosely
attached to the plasma membrane. What is the function of ribosomes?
A) Site of energy production
B) Site of protein synthesis
C) Site of genetic reproduction - ✔️✔️B, site of protein synthesis
What is a plasmid?
A) Self-replicating segment of double stranded DNA
B) Self-replicating segment of single stranded RNA
C) A bacterial chromosome - ✔️✔️A, self-replicating segment of double stranded DNA
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Bacteria do not always swim aimlessly but are attracted by such nutrients, such as
sugar and amino acids, and are repelled by harmful substances and bacterial waste
products. Movement toward chemical attractants and away from repellents is called:
A) Gliding motility
B) Tumbling
C) Chemotaxis - ✔️✔️C, chemotaxis
Some bacteria are considered pleomorphic. This means:
A) They are shaped like bent rods
B) They have a corkscrew shape
C) They do not have just one shape
D) They are either bacilli or cocci - ✔️✔️C, they do not have just one shape
Poly-beta-hydroxybutyrate inclusion bodies:
A) Protect bacteria from excessive drying
B) Store carbon for energy and biosynthesis
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C) Turn reddish brown when stained with iodine
D) Are composed of polymers of glucose - ✔️✔️B, store carbon for energy and
biosynthesis
Gas vesicles in bacteria:
A) Help move cells to optimal nutrient levels
B) Store oxygen for growth anaerobically
C) Are bounded by a lipid bi-layer membrane
D) Are bounded by a membrane impervious to gas - ✔️✔️A, help move cells to optimal
nutrient levels
Another common bacterial shape is that of a rod, often called:
A) Coccus
B) Bacillus
C) Pleomorphic - ✔️✔️B, bacillus
Magnetostomes in bacteria:
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