Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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| Be sure to answer all parts. The amino acid selenocysteine is one of the components of selenoproteins, more than 20 of which have been identified so far in human cells. In the structure of this interesting amino acid, how many of each type of hybrid orbital illustrated here are present? |
Transcribed Image Text:The image depicts the structural formula of selenocysteine, an amino acid. Here's a detailed explanation of the structure:
1. **Central Structure**: The molecule has a carbon backbone with two central carbon atoms.
2. **Functional Groups**:
- The left carbon is bonded to a carboxyl group (–COOH), which consists of a double-bonded oxygen (O=) and a hydroxyl group (–OH).
- The right carbon is bonded to a selenium-containing group (–SeH), which is selenocysteine's defining feature.
3. **Amino Group**:
- Attached to the central carbon is an amino group (–NH2).
4. **Hydrogens**:
- Additional hydrogen atoms are bonded throughout the structure to satisfy valency requirements:
- Two hydrogens are attached to the nitrogen of the amino group.
- Various hydrogens are attached to carbon atoms as part of the backbone structure.
5. **Connectivity**:
- The central carbon is also bonded to another hydrogen and a methylene group linking to the selenium atom.
This structure is commonly associated with protein synthesis involving specific redox reactions due to the presence of selenium.
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