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Amar Telidji-Laghouat University. Academic Year 2021/2022
era
Faculty of Medicine. 1 Year of Medicine.
EMD of January 6, 2022 (S1).
Module: cytology and cellular physiology.
Duration of the exam: 1 hour 30 minutes.
CORRECTION TYPE
Part 1 (0.5 x 10 = 5 points)
Answer true (T) or false (F) (correct if the statement is false) V/F
Gram staining is a technique that differentiates between pathogenic bacteria and symbiotic bacteria Gram staining is a technique F
1 that differentiates between Gram-positive and Gram-negative bacteria
The space that separates the two membranes of Gram- positive bacteria is called the periplasmic F
2
space. The space that separates the two membranes of Gram- negative bacteria is called the
periplasmic space . Sporulation is a survival strategy in an unfavorable environment observed in all F
3 bacteria. Sporulation is a survival strategy in an unfavorable environment observed in some (=certain) bacteria.
Bacteria always have a plasma membrane, a cytosol, DNA F
4 chromosomal and plasmid DNA. Bacteria always have a plasma membrane, a cytosol, chromosomal DNA, a cell wall, and ribosomes.
(further corrections are possible)
The wall of Gram + bacteria has molecules called teichoic acids, which cross a thick peptidoglycan. V
5
6 Before staining the slides prepared for observation by the MO, they must be deparaffinized. V
7 In TEM, an ultramicrotome is used to obtain ultrathin sections of 30 to 60 nm. V
In light microscopy, the resolving power is between 2 and 6 micrometers. F
8
In light microscopy, the resolving power is 0.2 micrometers.
Viruses are only obligate parasites of eukaryotic cells. F
9
Viruses are obligate parasites of eukaryotic and prokaryotic cells.
The brightfield optical microscope works by transmitting photons onto a very thin sample using F
10 electromagnetic lenses
The brightfield optical microscope works by transmitting photons onto a very thin sample using glass lenses.
Part 2: (0.5X10 = 5 points): Check the correct answer (QCS)
1. Which of the following statements about naked viruses is correct ?
A. They enter the cell by membrane fusion.
B. They are released from the infected cell by lysis of the cytoplasmic membrane. X
C. They are covered with a viral envelope.
D. They are released from the infected cell by membrane budding.
E. They are provided with spicules.
2. Which one of the following statements about Gram-negative bacteria is correct ?
A. Contain a thick wall.
B. Are impervious to alcohol.
C. Do not have a periplasmic space.
D. Have two membranes: an outer one and an inner plasma membrane. X
E. Always have a capsule.
1 /4
Amar Telidji-Laghouat University. Academic Year 2021/2022
era
Faculty of Medicine. 1 Year of Medicine.
EMD of January 6, 2022 (S1).
Module: cytology and cellular physiology.
Duration of the exam: 1 hour 30 minutes.
CORRECTION TYPE
Part 1 (0.5 x 10 = 5 points)
Answer true (T) or false (F) (correct if the statement is false) V/F
Gram staining is a technique that differentiates between pathogenic bacteria and symbiotic bacteria Gram staining is a technique F
1 that differentiates between Gram-positive and Gram-negative bacteria
The space that separates the two membranes of Gram- positive bacteria is called the periplasmic F
2
space. The space that separates the two membranes of Gram- negative bacteria is called the
periplasmic space . Sporulation is a survival strategy in an unfavorable environment observed in all F
3 bacteria. Sporulation is a survival strategy in an unfavorable environment observed in some (=certain) bacteria.
Bacteria always have a plasma membrane, a cytosol, DNA F
4 chromosomal and plasmid DNA. Bacteria always have a plasma membrane, a cytosol, chromosomal DNA, a cell wall, and ribosomes.
(further corrections are possible)
The wall of Gram + bacteria has molecules called teichoic acids, which cross a thick peptidoglycan. V
5
6 Before staining the slides prepared for observation by the MO, they must be deparaffinized. V
7 In TEM, an ultramicrotome is used to obtain ultrathin sections of 30 to 60 nm. V
In light microscopy, the resolving power is between 2 and 6 micrometers. F
8
In light microscopy, the resolving power is 0.2 micrometers.
Viruses are only obligate parasites of eukaryotic cells. F
9
Viruses are obligate parasites of eukaryotic and prokaryotic cells.
The brightfield optical microscope works by transmitting photons onto a very thin sample using F
10 electromagnetic lenses
The brightfield optical microscope works by transmitting photons onto a very thin sample using glass lenses.
Part 2: (0.5X10 = 5 points): Check the correct answer (QCS)
1. Which of the following statements about naked viruses is correct ?
A. They enter the cell by membrane fusion.
B. They are released from the infected cell by lysis of the cytoplasmic membrane. X
C. They are covered with a viral envelope.
D. They are released from the infected cell by membrane budding.
E. They are provided with spicules.
2. Which one of the following statements about Gram-negative bacteria is correct ?
A. Contain a thick wall.
B. Are impervious to alcohol.
C. Do not have a periplasmic space.
D. Have two membranes: an outer one and an inner plasma membrane. X
E. Always have a capsule.
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