MCB 3020 STUDY QUESTIONS AND
ANSWERS
A chemical bond formed by two atoms when they share pairs of
electrons to fill their outer shells is a/an :
A. Ionic bond
B. Covalent bond
C. Hydrophilic interaction
D. Hydrogen bond
E. Organic bond - CORRECT ANSWER-B. Covalent bond
Which of the fol...
A chemical bond formed by two atoms when they share pairs of
electrons to fill their outer shells is a/an :
A. Ionic bond
B. Covalent bond
C. Hydrophilic interaction
D. Hydrogen bond
E. Organic bond - CORRECT ANSWER-B. Covalent bond
Which of the following would a bacterium NOT have?
A. Mitochondria
B. Ribosome
C. DNA
D. Cell membrane - CORRECT ANSWER-A. Mitochondria
Which of the following structures adds flexibility and fluidity to
prokaryotic cell membranes?
A. hopanoids
B. cholesterol
C. glycocalyx
D. integral proteins
E. flagella - CORRECT ANSWER-A. hopanoids
Endospores are extremely resistant because they have:
,A. all of the answers are correct
B. DNA repair enzymes
C. DNA binding proteins
D. Dehydrated core
E. a sport coat - CORRECT ANSWER-
Antiport is a method of transportation during which one
substance is transported against its concentration gradient.
True
False - CORRECT ANSWER-False
Scanning electron microscopy magnifies cells structure by
100,000's time. This makes it the best tools for observing the
surface of bacteria
True
False - CORRECT ANSWER-True
Identify the FALSE statement
A. Gram staining procedure is a type of differential staining
procedure
B. Gram staining procedure is the most important staining
procedure in microbiology
C. Gram staining procedures can differentiate cells with thick
peptidoglycan from the cells with thin peptidoglycan layer
D. In Gram staining procedure Gram+ cells are blue (purple)
and Gram- cells appear red (pink)
E. None of the above is false - CORRECT ANSWER-E. None
of the above is false
Layers of material lying outside the cell wall that protect against
host immune system, protect against harsh environments,
facilitate attachment to surfaces, and facilitate motility of gliding
bacteria include:
A. All of them
B. Glycocalax
C. Capsules
, D. Slime layers
E. S-layers - CORRECT ANSWER-A. All of them
Which of the following DOES NOT match
A. These all match
B. Porins====Gram negatives
C. PMF====symport
D. Capsule====anti-phagocytic
E. LPS====Endotoxin - CORRECT ANSWER-A. These all
match
Plasmids can:
A. all of the answers are correct
B. carry genes that cause diseases
C. allow for horizontal genetic exchange between two unrelated
bacteria
D. carry genes resistant to antibiotics - CORRECT ANSWER-A.
all of the answers are correct
Which of the following is not correct
A. The higher the absorption the higher the optical density
B. All of these ARE correct
C. Cells grow at a constant rate during the growth phase
D. Generation time is measured during the growth (log) phase -
CORRECT ANSWER-B. All of these ARE correct
Peripheral proteins are imbedded within the membrane and not
easily removed
True
False - CORRECT ANSWER-False
A medium having a higher concentration of solutes than inside
the cell is
a (n) _____ ______, which causes the cell to ___________.
A. Hypotonic solution, Swell
B. Hypotonic solution, Shrivel
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