Please indicate the coordination geometry for the Heme A in the picture. A) tetrahedral B) octahedral C) square planar D) trigonal planar E) linear

Biochemistry
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Chapter1: Biochemistry: An Evolving Science
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Please indicate the coordination geometry for the Heme A in the picture.

A) tetrahedral

B) octahedral

C) square planar

D) trigonal planar

E) linear 

The image depicts the chemical structure of heme, a component of hemoglobin. 

**Description of the Structure:**

1. **Central Iron (Fe) Atom:**
   - The iron atom is centrally located and is a key component, as it binds oxygen molecules in hemoglobin.
   
2. **Porphyrin Ring:**
   - The structure consists of a porphyrin ring, composed of four pyrrole subunits (each containing a nitrogen atom) that are interconnected by methine bridges.

3. **Side Chains:**
   - Various side chains extend from the porphyrin ring, including vinyl, methyl, and propionate groups. Two propionate side chains are shown with carboxyl groups (–COOH).

4. **Phytol Chain:**
   - There is a long hydrophobic chain attached to the structure known as phytol, which contributes to the amphipathic nature of chlorophyll but is also a component in some heme variants.

This structure is crucial in biological systems for oxygen transport and various other biochemical processes.
Transcribed Image Text:The image depicts the chemical structure of heme, a component of hemoglobin. **Description of the Structure:** 1. **Central Iron (Fe) Atom:** - The iron atom is centrally located and is a key component, as it binds oxygen molecules in hemoglobin. 2. **Porphyrin Ring:** - The structure consists of a porphyrin ring, composed of four pyrrole subunits (each containing a nitrogen atom) that are interconnected by methine bridges. 3. **Side Chains:** - Various side chains extend from the porphyrin ring, including vinyl, methyl, and propionate groups. Two propionate side chains are shown with carboxyl groups (–COOH). 4. **Phytol Chain:** - There is a long hydrophobic chain attached to the structure known as phytol, which contributes to the amphipathic nature of chlorophyll but is also a component in some heme variants. This structure is crucial in biological systems for oxygen transport and various other biochemical processes.
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