Left-handed helix in protein's secondary structure is called as _?
Correct answer: B. Beta helix
- A. Alpha helix
- B. Beta helix
- C. Spiral
- D. Concentrate
Explanation
In protein secondary structure, the beta helix refers to a left-handed helical conformation formed by the polypeptide chain. It is characterized by the presence of beta strands, which are extended regions of the polypeptide chain that run alongside each other in a pleated sheet formation. The beta helix is different from the alpha helix, which is a right-handed helical structure commonly found in protein secondary structure. The beta helix has a more elongated and twisted conformation compared to the alpha helix.
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About Classification of Proteins
Proteins are classified by composition as simple, conjugated and derived proteins, and by shape as fibrous or globular proteins. The topic relates these classes to examples such as albumin, keratin, collagen, haemoglobin and casein, while distinguishing structural proteins from proteins with transport, catalytic or regulatory roles.
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