Question

Which of the following statements regarding hydrogen bonding in secondary structures is true? Group of answer choices Both α-helices and β-sheets only use intrachain hydrogen bonds. Both α-helices and β-sheets only use interchain hydrogen bonds. α-helices only use intrachain hydrogen bonds and β-sheets can use either intrachain or interchain hydrogen bonds. α-helices can use either intrachain or interchain hydrogen bonds and β-sheets only use interchain hydrogen bonds.

Answer 1

Answer:

The correct answer is "α-helices only use intrachain hydrogen bonds and β-sheets can use either intrachain or interchain hydrogen bonds".

Explanation:

Hydrogen bonding are essential forces for the formation of the secondary structures of proteins. The alpha helix is a coiled secondary structure that is stabilized only by intrachain hydrogen bonds, which are formed between the NH and CO groups of the main chain. On the other hand,  β-sheets can use either intrachain or interchain hydrogen bonds for its stabilization. Adjacent chains in β-sheets can run either in the same or opposite directions, which are stabilized by interchain hydrogen bonds.

Answer 2

The statement regarding hydrogen bonding in secondary structures which is true is: C. α-helices only use intrachain hydrogen bonds and β-sheets can use either intrachain or interchain hydrogen bonds.

Hydrogen bond can be defined as a weak chemical bond existing between a partially positively charged hydrogen atom and an electronegative chemical atom.

Protein is a macromolecule which is formed as a result of the union of many amino acids.

A hydrogen bond is an essential intermolecular force of attraction that is required for the formation of the secondary structures of proteins.

Generally, there are two (2) main types of secondary structure in proteins and these include:

• Alpha (α) helix: it's a right-handed coiled strand. It is only stabilized or maintained by intrachain hydrogen bonds, which are typically formed between amide hydrogens (NH) and carbonyl oxygens (CO) of the peptide backbone.

• Beta (β) sheets: it can be stabilized or maintained by either intrachain or interchain hydrogen bonds.

In conclusion, α-helices can only use intrachain hydrogen bonds while β-sheets can use either intrachain or interchain hydrogen bonds.

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