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Which statement about proteins is correc...

Which statement about proteins is correct ?

A

Collagen is an example of fibrous protein

B

Myoglobin is an example of a globular protein and contains a prosthetic group

C

Proteins are naturally occurring polypeptides

D

Hydrogen bonding between C = O and H - N groups

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement about proteins is correct, particularly focusing on the zwitterionic form of an amino acid, we can analyze the options provided. Here’s a step-by-step breakdown of the solution: ### Step-by-Step Solution: 1. **Understanding Amino Acids**: - Amino acids are organic compounds that serve as the building blocks of proteins. Each amino acid contains a central carbon atom (C) bonded to an amino group (NH2), a carboxyl group (COOH), a hydrogen atom (H), and a variable side chain (R group). **Hint**: Remember that the structure of an amino acid includes both an amino group and a carboxyl group. 2. **Formation of Zwitterion**: - In a zwitterionic form, the amino acid has both a positive and a negative charge, resulting in a net charge of zero. The carboxyl group (COOH) donates a proton (H+) and becomes negatively charged (COO−), while the amino group (NH2) accepts a proton and becomes positively charged (NH3+). **Hint**: Zwitterions are unique because they have both positive and negative charges but are overall neutral. 3. **Evaluating the Options**: - **Option A**: "The zwitter ion acts as only a base." - This is false. The zwitterion can act as both an acid and a base due to the presence of both acidic (COO−) and basic (NH3+) groups. **Hint**: Consider the dual nature of zwitterions in terms of acid-base chemistry. - **Option B**: "The zwitter ion carries an overall charge which can be positive or negative." - This is also false. The zwitterion is neutral overall because the positive and negative charges cancel each other out. **Hint**: Think about the net charge of the zwitterion. - **Option C**: "The zwitter ion is neutral overall." - This is correct. The zwitterion has equal positive and negative charges, resulting in a net charge of zero. **Hint**: Focus on the balance of charges in the zwitterion. - **Option D**: "The zwitter ion only acts as an acid." - This is false for the same reason as Option A; it can act as both an acid and a base. **Hint**: Remember that zwitterions can participate in both acid-base reactions. 4. **Conclusion**: - The correct statement about the zwitterionic form of an amino acid is that it is neutral overall. ### Final Answer: The correct statement about proteins, specifically regarding the zwitterionic form of an amino acid, is: **"The zwitter ion is neutral overall."**

To determine which statement about proteins is correct, particularly focusing on the zwitterionic form of an amino acid, we can analyze the options provided. Here’s a step-by-step breakdown of the solution: ### Step-by-Step Solution: 1. **Understanding Amino Acids**: - Amino acids are organic compounds that serve as the building blocks of proteins. Each amino acid contains a central carbon atom (C) bonded to an amino group (NH2), a carboxyl group (COOH), a hydrogen atom (H), and a variable side chain (R group). **Hint**: Remember that the structure of an amino acid includes both an amino group and a carboxyl group. ...
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