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__________ are different forms of an enzyme that catalyze the same reaction in different tissues in the body.

A lack of ascorbic acid (vitamin C) will result in reduced stability of _______.

Which of the following statements about hemoglobin is TRUE?

Which of the following statements about phosphofructokinase-1 and phosphofructokinase-2 is TRUE?

Bonus question: A 73-year-old woman comes to the physician because of a 2-month history of diffuse weakness and tingling of her arms and legs. Neurologic examination shows weakness of the extensor and flexor muscles of the lower extremities. Knee and ankle deep tendon reflexes are exaggerated. Sensation to vibration and position is decreased in all extremities, but the decrease is more prominent in the lower extremities than in the upper extremities. This patient most likely has a deficiency of which of the following vitamins?

Which enzymes are NOT among the seven internationally accepted classes of enzymes?

Pyruvate kinase is inhibited by the presence of __________.

The hydroxl (-OH) group of Serine in chymotrypsin attacking the carbonyl carbon of the substrate is an example of both ____________________.

Which of the following point mutation will most likely disrupt the alpha-helical structure of a protein?

Which of the following prevents protein misfolding?