Which mineral is required for the formation of hemoglobin? MCQ with Answer and Explanation

Which mineral is required for the formation of hemoglobin?
A. Iodine
B. Iron
C. Calcium
D. Zinc
Answer: Option B
Solution (By JKSSB Mock Tests)
Iron (Fe²⁺) is the central atom of heme in hemoglobin and myoglobin, essential for oxygen transport. Deficiency leads to microcytic hypochromic anemia. Good sources: liver, meat, leafy greens.

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Practice More Biology Questions

Question #1
In genetics, the 'TATA box' is a conserved DNA sequence found in the promoter region of many eukaryotic genes. It is recognized and bound by:
A. The ribosome
B. TATA-binding protein (TBP), a subunit of TFIID
C. RNA polymerase I
D. DNA ligase

Correct Answer: Option B


Explanation:
The TATA box (consensus sequence TATAAA) is a highly conserved DNA sequence located about 25-30 base pairs upstream of the transcription start site in the promoter region of many eukaryotic genes transcribed by RNA polymerase II. It is specifically recognized and bound by the TATA-binding protein (TBP), which is a crucial subunit of the general transcription factor TFIID. The binding of TBP initiates the assembly of the pre-initiation complex, including RNA polymerase II, allowing transcription to begin.

This question belongs to: Science Biology
Question #2
Ascariasis is a common helminthic disease caused by:
A. Taenia solium
B. Ancylostoma duodenale
C. Wuchereria bancrofti
D. Ascaris lumbricoides

Correct Answer: Option D


Explanation:
Ascariasis is caused by the large roundworm Ascaris lumbricoides, which is the most common human helminth infection globally. Infection occurs through the ingestion of embryonated eggs from contaminated soil, food, or water. The worms reside in the small intestine and can cause malnutrition, intestinal blockage, and other complications.

This question belongs to: Science Biology
Question #3
The organ that filters blood, removes old RBCs, and stores platelets is the:
A. Spleen
B. Pancreas
C. Liver
D. Kidney

Correct Answer: Option A


Explanation:
The spleen, located in the upper left abdomen, filters blood, removes senescent or damaged red blood cells, stores platelets and white blood cells, and mounts immune responses. The liver processes nutrients and toxins, kidneys filter blood to produce urine, pancreas secretes enzymes/hormones.

This question belongs to: Science Biology