Multiple choice

The defective type of hemoglobin in sickle -cell anemia has _________ red-blood corpuscles.

  1. sickle - shaped

  2. dead

  3. round - shaped

  4. normal

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sickle-cell anemia is caused by a genetic mutation that produces abnormal hemoglobin (HbS). When oxygen levels are low, this hemoglobin polymerizes and causes red blood cells to become rigid and sickle-shaped, unlike normal biconcave discs.