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Prepare pan: Mix graham cracker crumbs, 2 T sugar, cinnamon, and melted buttter.
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Line 8" or 8 1/2" springform pan with crumb mixture on bottom and insides of pan.
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Refrigerate until ready to fill.
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Whip egg whites til stiff and dry.
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With cream cheese at room temperature, beat until soft.
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Add 1 cup sugar and blend.
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Beat in egg yolks, one at a time.
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Blend in well: sour cream, flour, vanilla, and lemon extract.
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Fold in whipped egg whites.
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Pour mixture into prepared pan.
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Place cheesecake in a preheated oven (350 F) in shallow pan of hot water.
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Bake for one hour and 20 minutes.
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Turn off oven; leaving cake inside, allow it to cool off in the oven for 1-2 hours.
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Remove from oven and let stand.
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When at room temperature, refrigerate and let remain overnight.