The following question is based on the 15 molecules illustrated in the figures.

Which molecule has both hydrophilic and hydrophobic properties and is found in plasma membranes?

Question

The following question is based on the 15 molecules illustrated in the figures.

Which molecule has both hydrophilic and hydrophobic properties and is found in plasma membranes?

BlackTom AI · Accepted Answer

To determine which molecule has both hydrophilic and hydrophobic properties and is found in plasma membranes, I will evaluate each option based on typical features of membrane phospholipids versus other biomolecules.
Option 1: This molecule appears to show multiple hydroxyl groups (–OH) and seems highly hydrophilic, but there is no clear hydrophobic tail region depicted. If it is mostly polar/sugar-like without a distinct nonpolar tail, it would be less characteristic of a membrane phospholipid. Therefore, option 1 may be hydrophilic but not the amphipathic type required for a membrane component.
Option 14: Similar to option 1, this candidate seems to emphasize polar groups without a distinct hydrophobic hydrocarbon chain. Without a nonpolar region, it would not be amphipathic, making it unlikely to function as a membrane-spanning lipid.
Option 12: Again, this structure appears to emphasize polar functionalities. The absence of a defined nonpolar tail would argue against amphipathicity and typical plasma membrane localization, where both head and tail regions are essential.
Option 5: This molecule is presented with a polar head group (hydrophilic) and a nonpolar hydrocarbon tail (hydrophobic), which is the classic architecture of a phospholipid. Such amphipathic molecules are embedded in the plasma membrane, with heads oriented toward the aqueous environments and tails forming the interior of the lipid bilayer. This combination aligns precisely with the properties described.
In summary, among the options, the one that best fits the criteria of having both hydrophilic and hydrophobic regions and being associated with plasma membranes is the molecule displaying the amphipathic phospholipid pattern (polar head plus nonpolar tail). The other choices lack either the hydrophobic tail component or the membrane-associated amphipathic arrangement, which disqualifies them as membrane phospholipids.

W25 BIOL D006B 01Y Cell & Molecular Biology Lecture Exam 1

The following question is based on the 15 molecules illustrated in the figures. Which molecule has both hydrophilic and hydrophobic properties and is found in plasma membranes?

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