Protein Structure
Sickle cell disease is due to

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

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Protein Structure
Cyclins are proteins that

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

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Protein Structure
Metastasis involves

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

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