Before absorption, dietary copper must undergo:
Anonymous Quiz
25%
A) Oxidation
50%
B) Reduction
20%
C) Hydrolysis
5%
D) Methylation
Copper absorption mainly occurs in the:
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15%
A) Stomach
38%
B) Jejunum
46%
C) Duodenum
Which transporter is responsible for copper entry into enterocytes?
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12%
A) DMT1
52%
B) CTR1
28%
C) Na⁺/K⁺ pump
8%
D) GLUT4
High copper levels in the intestine will lead to:
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27%
A) Increased CTR1 synthesis
27%
B) Decreased CTR1 synthesis
27%
C) No change
18%
D) Increased oxidation
Which of the following competes with copper absorption?
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12%
A) Sodium
15%
B) Potassium
69%
C) Zinc
4%
D) Chloride
Which of the following can increase copper absorption by affecting transporter production?
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9%
A) Insulin
26%
B) Cortisol
52%
C) Thyroid hormones
13%
D) Glucagon
Superoxide (O₂⁻) is produced mainly from:
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9%
A) DNA replication
17%
B) Glycolysis
70%
C) Mitochondrial respiration
4%
D) Protein synthesis
The role of copper in dealing with free radicals is to:
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16%
A) Produce radicals
68%
B) Stabilize them by electron transfer
8%
C) Store them
8%
D) Convert them into DNA
Lipid peroxidation caused by free radicals leads to:
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31%
A. Increased membrane strength
46%
B. Cell membrane destruction
8%
C. DNA repair
15%
D. Enzyme activation
Copper chaperone proteins are important because they:
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9%
A. Increase copper absorption
36%
B. Store copper permanently
45%
C. Determine copper intracellular destination
9%
D. Oxidize copper
Which protein delivers copper to the Golgi apparatus?
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17%
A. CCS
42%
B. COX17
8%
C. ATOX1
33%
D. Metallothionein
ATP7A is responsible for:
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7%
A. Copper storage
43%
B. Export of copper from enterocyte to blood
14%
C. Copper excretion into bile
36%
D. Copper transport to mitochondria
After leaving the enterocyte, copper binds in blood to:
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41%
A. Ceruloplasmin only
18%
B. Hemoglobin
35%
C. Albumin and transcuprein
6%
D. Transferrin
The major carrier of copper in circulation (90–95%) is:
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32%
A. Albumin
11%
B. Transcuprein
42%
C. Ceruloplasmin
16%
D. Metallothionein
Copper chaperone CCS delivers copper to:
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31%
A. Golgi apparatus
15%
B. Mitochondria
38%
C. Superoxide dismutase
15%
D. Nucleus
COX17 delivers copper to:
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0%
A. Lysosomes
38%
B. Mitochondria
38%
C. Golgi apparatus
23%
D. Cytosol
Metallothionein in enterocytes functions to:
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7%
A. Permanently eliminate copper
47%
B. Transport copper to blood
40%
C. Store copper temporarily
7%
D. Oxidize copper
Which protein is responsible for copper excretion into bile?
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23%
A. ATP7A
29%
B. ATP7B
29%
C. CTR1
19%
D. CCS
الاسئلة اللي مو MCQ اذا متكتبوها نفس الصيغة اللي اني كاتبها راح ينطيكم غلط. انتم معليكم من تشوفون الجواب اللي كاتبه اني نفس او مقارب للجواب اللي كاتبه اعتبروه صح حتى لو منطيكم هو خطأ.