Multiple choice

Type 'O' is a universal donor because it has _____.

  1. no antibodies

  2. antibodies in diluted form

  3. no antigens

  4. no white blood cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Type O blood lacks both A and B antigens on red blood cells, making it compatible with all other blood types. Universal donors can give to anyone because recipient antibodies won't attack O cells. Type O has both anti-A and anti-B antibodies in plasma, but the absent RBC antigens are what matters for donation.

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