Question 29 of 36 Classify the amino acid depicted here in the form which it would be found at physiological pH (~7.4).

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### Classifying Amino Acids at Physiological pH

**Question:**
Classify the amino acid depicted here in the form which it would be found at physiological pH (~7.4).

**Options:**
A) Acidic  
B) Basic  
C) Nonpolar  
D) Neutral  
E) Hydrophobic  

**Diagram Explanation:**
The diagram on the left side of the screen shows the chemical structure of an amino acid. Let's break down this structure:

- **Amino Group (NH₃⁺):** Appears as "H₃N⁺" at the left end of the molecule, indicating this amino acid exists in its protonated form.
- **Carboxyl Group (COO⁻):** Appears as "C=O" and "C-O⁻" on the right side, indicating a deprotonated state.
- **Side Chain (R-Group):** The side chain contains an additional amino group ("NH₂"), suggesting that it has basic properties.

**Answer Analysis:**
At physiological pH (approximately 7.4), amino acids will exist in a zwitterionic form where the amino group is protonated (NH₃⁺) and the carboxyl group is deprotonated (COO⁻). Given the presence of an additional amino group in its side chain, this amino acid has characteristics of a basic amino acid.

**Correct Classification:**
B) Basic
Transcribed Image Text:### Classifying Amino Acids at Physiological pH **Question:** Classify the amino acid depicted here in the form which it would be found at physiological pH (~7.4). **Options:** A) Acidic B) Basic C) Nonpolar D) Neutral E) Hydrophobic **Diagram Explanation:** The diagram on the left side of the screen shows the chemical structure of an amino acid. Let's break down this structure: - **Amino Group (NH₃⁺):** Appears as "H₃N⁺" at the left end of the molecule, indicating this amino acid exists in its protonated form. - **Carboxyl Group (COO⁻):** Appears as "C=O" and "C-O⁻" on the right side, indicating a deprotonated state. - **Side Chain (R-Group):** The side chain contains an additional amino group ("NH₂"), suggesting that it has basic properties. **Answer Analysis:** At physiological pH (approximately 7.4), amino acids will exist in a zwitterionic form where the amino group is protonated (NH₃⁺) and the carboxyl group is deprotonated (COO⁻). Given the presence of an additional amino group in its side chain, this amino acid has characteristics of a basic amino acid. **Correct Classification:** B) Basic
### Question on Amino Acid Characteristics

**Question 30 of 36:**

**What set of words best describes the side chain of the amino acid Threonine?**

Below, you will find multiple-choice options. Select the most accurate description of Threonine's side chain from the following:

A) Non-polar, hydrophobic, neutral

B) Polar, hydrophilic, neutral

C) Polar, hydrophobic, neutral

D) Polar, hydrophilic, basic

E) Polar, hydrophilic, acidic

**Explanation:**

- **Amino Acid Side Chains:** Amino acids, the building blocks of proteins, have side chains that can be categorized based on their polarity (polar, non-polar), affinity for water (hydrophilic, hydrophobic), and the pH of their side chain (neutral, acidic, basic).

- **Threonine:** It is one of the 20 standard amino acids used by cells to synthesize proteins. Knowing its characteristics helps in understanding its role and behavior in protein structures.

**Discussion:**

In this multiple-choice question, students are tested on their knowledge of amino acid side chain properties. The correct identification will aid in understanding how these properties influence protein folding, stability, and interaction with other molecules. This type of question is common in biochemistry and molecular biology studies.
Transcribed Image Text:### Question on Amino Acid Characteristics **Question 30 of 36:** **What set of words best describes the side chain of the amino acid Threonine?** Below, you will find multiple-choice options. Select the most accurate description of Threonine's side chain from the following: A) Non-polar, hydrophobic, neutral B) Polar, hydrophilic, neutral C) Polar, hydrophobic, neutral D) Polar, hydrophilic, basic E) Polar, hydrophilic, acidic **Explanation:** - **Amino Acid Side Chains:** Amino acids, the building blocks of proteins, have side chains that can be categorized based on their polarity (polar, non-polar), affinity for water (hydrophilic, hydrophobic), and the pH of their side chain (neutral, acidic, basic). - **Threonine:** It is one of the 20 standard amino acids used by cells to synthesize proteins. Knowing its characteristics helps in understanding its role and behavior in protein structures. **Discussion:** In this multiple-choice question, students are tested on their knowledge of amino acid side chain properties. The correct identification will aid in understanding how these properties influence protein folding, stability, and interaction with other molecules. This type of question is common in biochemistry and molecular biology studies.
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