★ Atoms and Radioactivity Quiz
What particle is released when an unstable isotope undergoes alpha radiation?
A. a helium nucleus
B. an electron
C. a photon of light
D. a neutron
Select your answer:

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Sarcomere Anatomy › ViewWhich part of a sarcomere contains only thin filaments?
A. I band
B. A band
C. H zone
D. M zone
Prokaryotic Cells and Viruses › View
Viruses are living. They do not have cells. (Ellas no tienen celulas)
A. yes
B. no