Lecture 20 Iron - MC

Question 1

In what forms does iron occur in the human body and food?
A) Only in the ferrous (Fe2+) state
B) Only in the ferric (Fe3+) state
C) Both ferrous (Fe2+) and ferric (Fe3+) states
D) In the ionic state

Answer 1

C

Question 2

Where is most of the iron in the human body found?
A) In the liver
B) In red blood cells as part of hemoglobin
C) In muscle tissue as part of myoglobin
D) In bone marrow

Answer 2

B

Question 3

How is non-heme iron absorbed compared to heme iron?
A) More efficiently than heme iron
B) With the same efficiency as heme iron
C) Less efficiently than heme iron
D) Through the same transport proteins as heme iron

Answer 3

C

Question 4

*Which of the following is NOT a factor that enhances iron absorption?
A) Phytate
B) Vitamin C
C) Gastric acidity
D) Meat

Answer 4

A

Question 5

What role does transferrin play in the body?
A) It stores iron in the liver.
B) It is a protein that transports iron in the blood.
C) It breaks down heme iron in the intestines.
D) It is a type of non-heme iron found in plant foods.

Answer 5

B

Question 6

How is heme iron absorbed in the human body?
A) It binds with transferrin directly in the stomach.
B) It is absorbed intact across the enterocyte brush border by heme carrier protein 1 (hcp1).
C) It requires vitamin C to be solubilized before absorption.
D) It undergoes oxidation before being absorbed.

Answer 6

B

Question 7

Which compound is primarily responsible for the storage of iron in the body?
A) Transferrin
B) Myoglobin
C) Ferritin
D) Hemoglobin

Answer 7

C