on losing the carboxyl group as carbon dioxide , amnio acids form biologically active

Options

A. Glucose
B. Amine such as histamine
C. Alcohol
D. N- base

Answer

To solve the question regarding what biologically active compounds are formed when amino acids lose their carboxyl group as carbon dioxide, we can follow these steps:

### Step 1: Understand the Structure of Amino Acids
Amino acids have a central carbon atom (alpha carbon) attached to four different groups: an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom (H), and a variable side chain (R group).

### Step 2: Identify the Process of Decarboxylation
Decarboxylation is the process where the carboxyl group (-COOH) is removed from the amino acid, releasing carbon dioxide (CO2). This reaction is facilitated by enzymes known as decarboxylases.

### Step 3: Determine the Result of Decarboxylation
When the carboxyl group is removed, the amino acid transforms into an amine. The amino group (-NH2) remains intact, and the resulting compound is a biologically active amine.

### Step 4: Provide Examples of Biologically Active Compounds
One example of a biologically active compound formed through decarboxylation is histamine, which is derived from the amino acid histidine. Other biologically active amines can include neurotransmitters and hormones.

### Step 5: Analyze the Given Options
In the context of the question, we need to assess the options provided:
1. Glucose
2. Amines such as histamine
3. Alcohol
4. Nitrogenous bases

From our analysis, the correct answer is option 2: Amines such as histamine.

### Final Answer
On losing the carboxyl group as carbon dioxide, amino acids form biologically active compounds known as amines, such as histamine.

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