Multiple choice

Which of the following are examples of chromoprotein?

  1. Haemoglobin and rhodopsin

  2. Zein and keratin

  3. Haemoglobin and casein

  4. Casein and keratin

  5. Rhodopsin and Zein
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A Correct answer
Explanation

Chromoproteins are proteins, such as hemoglobin or rhodopsin. They contain a pigmented nonprotein group, as heme, riboflavin, or retinal.

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