Protein Structure
Sickle cell disease is due to

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

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Protein Structure
Cyclins are proteins that

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

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Protein Structure
Metastasis involves

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

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