Protein Structure
Sickle cell disease is due to

a mutation in the alpha chain of Hb
a mutation in the beta chain of Hb
None of these
infection with a parasite

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Protein Structure
Cyclins are proteins that

None of these
regulate ability of cells to invade tissue
regulate passage from one stage of cell division to another
regulate apoptosis of damaged cells

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Protein Structure
Metastasis involves

decreased levels of proteins that regulate metalloproteins
ability of cells to dissolve cellular matrix
All of these
metalloprotein levels

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