Which statement correctly describes amphipathic (or amphiphilic) helices and sheets?

Question

Which statement accurately describes amphipathic (or amphiphilic) helices and sheets?

Sheets are typically hydrophilic on one surface, while helices usually have both hydrophilic and hydrophobic residues evenly distributed throughout their structure. 
Helices are generally hydrophilic on one surface, whereas sheets often have both hydrophilic and hydrophobic residues evenly distributed throughout their structure. 
Amphipathic helices and sheets have predominantly hydrophilic residues on one face and predominantly hydrophobic residues on the opposite face. 
Amphipathic helices and sheets have hydrophilic and hydrophobic residues evenly distributed throughout their structure.

Ms. Aryanna Gutkowski DDS · Accepted Answer

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Lou Lubowitz · Answer

Explanation:Each residue that is hydrophobic lies on one side forming amphipathic α-helix.This periodicity would allow the formation of hydrophobic surface on one face of the helix thereby allowing it to fold against hydrophobic region of the protein.

Anonymous · Answer

Hey there!The purpose of guard cells is to control the opening and closing of the Stomata, keeping it the correct width, or size.Therefore, your correct answer would be Option 3, control the size of the Stomata.Hope this helps!Read more on -

Anonymous · Answer

Option DExplanation:If an aspartic acid were present in the interior of a globular protein, it would most likely change the conformation of the protein, maybe changing its shape and ultimately its function. To ensure compactness of the interior, hydrophobic amino acid are mainly found in the interior of globular proteins. This acid can be deprotonated and become negatively charged if the surrounding solution's pH is raised changing their isoelectric points.

Anonymous · Answer

The correct answer is the last statement. Explanation:Amphipathic refers to a substance that comprises both hydrophobic and hydrophilic surfaces. Thus, the given first three statements are incorrect. The amphipathic helices are witnessed on the proteins surfaces in which the hydrophilic region associates with the aqueous phase and the hydrophobic regions associate with the hydrophobic component of the protein.  Both the amphipathic sheets and helices exhibit primarily the hydrophobic or hydrophilic residues on one face. Thus, the correct answer is the last statement.

Anonymous · Answer

The hydrophobic residues functions as a binding agent for the protein to the membrane Explanation:The membrane is a phospholipid bilayer that consists primarily of fatty acetyl groups. The protein has hydrophobic side chains that interacts with those fatty acetyl groups, forming a bond that will basically have the the protein anchored to the phospholipid bilayer membrane.

Esperanza Gerlach

Which statement correctly describes amphipathic (or amphiphilic) helices and sheets?

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