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Which is true about cholesterol or its connection with health risks?

A. High cholesterol is a health risk for development of a therosclerosis.

B. The chemical structure of cholesterol itself is the same in"good cholesterol" and "bad cholesterol."

C. Cholesterol levels can often be lowered by taking medicines called statins.

D. Cholesterol is circulated in the blood as part of complexes called lipoproteins.

E. All of the above are true.

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Which of the following statements about hemoglobin and myoglobin structure are true? Select the five true statements.

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Heme is composed of an organic protoporphyrin component and a metal atom.

Hemoglobin is a heterotetramer, whereas myoglobin is a monomer.

Molecular oxygen binds reversibly to Fe2+ in heme.

Each hemoglobin or myoglobin molecule can bind four oxygen molecules.

Each iron atom can form six coordination bonds: Two of these bonds are formed between iron and oxygen.

By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron atom.

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