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Amar Telidji-Laghouat University era 1 Faculty of Medicine May 26, 2022
year of medicine
Medium-Term Cytology and Cell Physiology Test (S2). (Duration: 1h30)
CORRECTION TYPE
Part 1: (0.5X10 = 5 points)
Answer true (T) or false (F) (correct the false statement) V/F
For AQP2 transporters to open, the hormone ADH must first bind to receptors located on the apical pole of the F
1
nephron collecting duct.
ADH receptors are located at the basal pole of the collecting duct of the nephron
The sample observed by the scanning electron microscope must be covered with a layer of platinum and the image F
2
obtained is real.
The resulting image is reconstructed
Through the Zonula Adherens junction, metabolites pass from the intestinal lumen to the cytosol of enterocytes only F
3
through the apical pole (microvilli)
This is thanks to the Zonula Occludens junction.
4 Immunofluorescence is detected by light microscopy V
5 Intracellular components can only be isolated after membrane destruction V
plasma
After sucrose density gradient (SDG) ultracentrifugation of pellet 2, mitochondria are deposited higher than lysosomes F
6
Mitochondria are deposited lower than lysosomes and higher than peroxisomes
Cilia are apical specializations, made up of actin microfilaments and found in the oviduct and trachea F
7
The cilia are occupied in the center by microtubules
The plasma membrane is an asymmetric structure due to the presence of peripheral proteins on the outer hemilayer F
8
The plasma membrane is an asymmetric structure due to the presence of glycocalix on the extracellular face
Glucose moves from the intestinal lumen to the enterocyte cytosol by secondary active transport SGLT1 Na+/K+ and F
then from the cytosol to the blood (at the basal pole) by facilitated diffusion
9
Glucose moves from the intestinal lumen to the enterocyte cytosol by secondary active transport SGLT1 glucose/Na+
and then from the cytosol to the blood (at the basal pole) by facilitated diffusion
10 The largest part constituting the membrane of a neuron's myelin sheath is of a natural V
lipid
Part 2: (0.5x10 = 5 points): Tick the correct answer (QCS)
1. All membrane lipids are (only one statement is false):
A. Amphiphiles
B. Hydrophiles in the extracellular part
C. Hydrophobes in the intracellular part X
D. Asymmetrical
2. A glycerophospholipid (only one proposition is correct):
A. Its head contains a sphingosine
B. Its tail contains a single chain of fatty acids
C. Glycerol is part of the hydrophobic region
D. Its composition = Alcohol or amino acid + Phosphate + Glycerol + 2 fatty acids X
1/4
Amar Telidji-Laghouat University era 1 Faculty of Medicine May 26, 2022
year of medicine
Medium-Term Cytology and Cell Physiology Test (S2). (Duration: 1h30)
CORRECTION TYPE
Part 1: (0.5X10 = 5 points)
Answer true (T) or false (F) (correct the false statement) V/F
For AQP2 transporters to open, the hormone ADH must first bind to receptors located on the apical pole of the F
1
nephron collecting duct.
ADH receptors are located at the basal pole of the collecting duct of the nephron
The sample observed by the scanning electron microscope must be covered with a layer of platinum and the image F
2
obtained is real.
The resulting image is reconstructed
Through the Zonula Adherens junction, metabolites pass from the intestinal lumen to the cytosol of enterocytes only F
3
through the apical pole (microvilli)
This is thanks to the Zonula Occludens junction.
4 Immunofluorescence is detected by light microscopy V
5 Intracellular components can only be isolated after membrane destruction V
plasma
After sucrose density gradient (SDG) ultracentrifugation of pellet 2, mitochondria are deposited higher than lysosomes F
6
Mitochondria are deposited lower than lysosomes and higher than peroxisomes
Cilia are apical specializations, made up of actin microfilaments and found in the oviduct and trachea F
7
The cilia are occupied in the center by microtubules
The plasma membrane is an asymmetric structure due to the presence of peripheral proteins on the outer hemilayer F
8
The plasma membrane is an asymmetric structure due to the presence of glycocalix on the extracellular face
Glucose moves from the intestinal lumen to the enterocyte cytosol by secondary active transport SGLT1 Na+/K+ and F
then from the cytosol to the blood (at the basal pole) by facilitated diffusion
9
Glucose moves from the intestinal lumen to the enterocyte cytosol by secondary active transport SGLT1 glucose/Na+
and then from the cytosol to the blood (at the basal pole) by facilitated diffusion
10 The largest part constituting the membrane of a neuron's myelin sheath is of a natural V
lipid
Part 2: (0.5x10 = 5 points): Tick the correct answer (QCS)
1. All membrane lipids are (only one statement is false):
A. Amphiphiles
B. Hydrophiles in the extracellular part
C. Hydrophobes in the intracellular part X
D. Asymmetrical
2. A glycerophospholipid (only one proposition is correct):
A. Its head contains a sphingosine
B. Its tail contains a single chain of fatty acids
C. Glycerol is part of the hydrophobic region
D. Its composition = Alcohol or amino acid + Phosphate + Glycerol + 2 fatty acids X
1/4
