Question 9 of 25 Submit representing L-alanine and two representing D-alanine. Which pair represents D-alanine? A B *H3N-C-H *H3N- -CH3 ČH3 H D H3C- -C- -NH3* H -C-NH3* CH3 A) A and B C.
Neutral Amino Acids
Amino acids which do not have any charge on them are neutral amino acids.
Globular Protein
The globular proteins refer to the shape of protein specifically spherical in nature apart from spherical form fibrous, disordered and membrane-bound proteins exist. These globular proteins are miscible in water and form a colloidal solution rather than other types which might not exhibit solubility. Many classes of the fold are found in globular proteins, which render them a sphere shape. Globular fold containing proteins usually are referred to by the term globin.
Dimer
Dimers are basic organic compounds, which are derivates of oligomers. It is formed by the combination of two monomers which could potentially be strong or weak and in most cases covalent or intermolecular in nature. Identical monomers are called homodimer, the non-identical dimers are called heterodimer. The method by which dimers are formed is known as “dimerization”.
Dipeptide
A dipeptide is considered a mixture of two distinct amino acids. Since the amino acids are distinct, based on their composition, two dipeptide's isomers can be produced. Various dipeptides are biologically essential and are therefore crucial to industry.
![**Question 9 of 25**
Two of the structures below are models representing L-alanine and two representing D-alanine. Which pair represents D-alanine?
**Diagrams:**
- **Structure A:**
- Contains a central carbon (C) with four bonds:
- A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom).
- An amino group (\(+\text{H}_3\text{N}\)).
- A hydrogen atom (H).
- A methyl group (\( \text{CH}_3\)).
- **Structure B:**
- Contains a central carbon (C) with four bonds:
- A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom).
- An amino group (\(+\text{H}_3\text{N}\)).
- A methyl group (\( \text{CH}_3\)).
- A hydrogen atom (H).
- **Structure C:**
- Contains a central carbon (C) with four bonds:
- A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom).
- A methyl group (\( \text{CH}_3\)).
- A hydrogen atom (H).
- An amino group (\(+\text{NH}_3^+\)).
- **Structure D:**
- Contains a central carbon (C) with four bonds:
- A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom).
- A hydrogen atom (H).
- A methyl group (\( \text{CH}_3\)).
- An amino group (\(+\text{NH}_3^+\)).
**Options:**
A) A and B
B) C and D
C) A and C
D) B and D](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0ee510d1-3e71-4430-9a24-3ef244ffe765%2F91736c98-34e7-4aa2-9dc3-d3c1c1be73b7%2Fb74rqhs_processed.jpeg&w=3840&q=75)
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