Which of the Following Statements Regarding Important Porphyrins and Chlorins

question 84

Multiple Choice

Which of the following statements regarding important porphyrins and chlorins found in nature is NOT correct?

• A)Chlorophyll can absorb red and blue light owing to the presence of delocalized p electrons in the chlorin ring.
• B)Chlorophyll contains a central Mg²⁺ ion in a chlorin ring structure.
• C)Carbon monoxide binds at the axial site of the Fe²⁺ ion in heme more strongly than oxygen,which prevents O₂ from being taken up and transported through the body.
• D)Cytochromes contain Fe²⁺ ions that bind oxygen during metabolic processes,which allows O₂ to be transported into and out of cells.
• E)All of these are correct.

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Definitions:

Natural Radioactivity

The phenomenon by which certain elements spontaneously emit radiation as a result of the decay of their atomic nuclei.

Gamma Rays

High-energy electromagnetic radiation emitted by atomic nuclei during radioactive decay.

Contaminated Soil

Soil that has been polluted by hazardous substances, rendering it toxic to humans, animals, or plants.