★ Composition of Blood and Blood Cells Quiz
Erythrocytes contain the protein ______ that carries oxygen.
A. hemoglobin
B. melanin
C. keratin
D. collagen
Select your answer:
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Health › Viewhormone that triggers sleepiness and functions as antioxidant
A. ovaries
B. melatonin
C. testes
Uses of Radioactive Radiation › View
Which of these is a use of alpha radiation?
A. Sterilising food
B. Smoke detectors
C. Monitoring paper thickness
D. Industrial tracers