The iron-containing protein in RBCs that transports oxygen is: MCQ with Answer and Explanation

The iron-containing protein in RBCs that transports oxygen is:
A. Hemoglobin
B. Collagen
C. Albumin
D. Myoglobin
Answer: Option A
Solution (By JKSSB Mock Tests)
Hemoglobin in red blood cells binds oxygen in the lungs and releases it in tissues. Each hemoglobin molecule can bind four O₂ molecules. It also carries some CO₂.

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Practice More Biology Questions

Question #1
Apical dominance in plants is primarily controlled by which hormone?
A. Gibberellin
B. Ethylene
C. Auxin
D. Cytokinin

Correct Answer: Option C


Explanation:
Apical dominance is the phenomenon where the main central stem (apical bud) grows more strongly than the side stems (lateral buds). This is primarily controlled by auxin (specifically IAA), which is produced at the shoot apex and moves downwards, inhibiting the growth of lateral buds. Removal of the apical bud promotes lateral branching.

This question belongs to: Science Biology
Question #2
Which of the following animals belongs to the class Chondrichthyes?
A. Hippocampus
B. Labeo rohita
C. Pristis (Sawfish)
D. Catla catla

Correct Answer: Option C


Explanation:
Chondrichthyes are cartilaginous fishes with a skeleton made entirely of cartilage, a ventral mouth, and lack operculum. Pristis (sawfish), Scoliodon (dogfish), and Carcharodon (great white shark) belong to this class. Labeo rohita (Rohu) and Catla catla are Osteichthyes (bony fishes). Hippocampus (seahorse) is also a bony fish. Exam tip: Chondrichthyes = cartilaginous; Osteichthyes = bony.

This question belongs to: Science Biology
Question #3
The process of protein folding that is assisted by chaperone proteins occurs in the:
A. Golgi apparatus
B. Lysosome
C. Endoplasmic reticulum
D. Nucleus

Correct Answer: Option C


Explanation:
Chaperone proteins like BiP assist in proper protein folding in the rough ER. Misfolded proteins are degraded. Golgi modifies, lysosome digests.

This question belongs to: Science Biology