Cell Membranes Typically Display Asymmetry

question 94

Multiple Choice

Cell membranes typically display asymmetry. What does this mean?

• A) The two leaves of a bilayer contain different collections of lipids and proteins.
• B) The fatty acyl chain on C-1 of a membrane lipid is usually different from that on C-3.
• C) Only one stereoisomer is ever seen at the chiral C-2 of the glycerol residue in a membrane lipid.
• D) Membrane lipids only have cis double bonds, never trans .

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Definitions:

Disjunctive

Pertaining to a logical relation involving a choice between two or more alternatives, often expressed as an "or" statement in logic.

Ingredient

A component or element that is part of a larger mixture, recipe, or formula.

Categorical Proposition

A logical statement that relates two categories or classes in terms of inclusion, exclusion, or partial inclusion.

Universal

In logic, a universal statement is one that asserts something about every member of a particular category.