BIOCHEMISTRY
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Biochemistry Quiz
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Question 1 of 2
1. Question
1 pointsInsulin receptor is a
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Question 2 of 2
2. Question
1 pointsThe substitution of valine for glutamate at position 6 on the two β chains in sickle cell haemoglobin causes which of the following?
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The carboxyl of glutamate at position 6 on the 3 chain of normal hemoglobin is dissociated and negatively charged at pH 7.0. Substitution of uncharged valine for glutamate by mutation produces sickle cell hemoglobin, which is less negatively charged and has an increased electrophoretic mobility. Polymerization of the deoxygenated, form of 5ickle hemoglobin occurs owing to the alteration of primary structure caused by the valine substitution. The insoluble, polymerized herno globin causes the erythrocyte to lose flexibility and to become rigid and sickle-shaped. The brittle cells produce anemia and block capillaries.
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The carboxyl of glutamate at position 6 on the 3 chain of normal hemoglobin is dissociated and negatively charged at pH 7.0. Substitution of uncharged valine for glutamate by mutation produces sickle cell hemoglobin, which is less negatively charged and has an increased electrophoretic mobility. Polymerization of the deoxygenated, form of 5ickle hemoglobin occurs owing to the alteration of primary structure caused by the valine substitution. The insoluble, polymerized herno globin causes the erythrocyte to lose flexibility and to become rigid and sickle-shaped. The brittle cells produce anemia and block capillaries.