Why Would a Transverse Diffusion or Flip-Flop of Membrane Phospholipids

question 19

Multiple Choice

Why would a transverse diffusion or flip-flop of membrane phospholipids from one leaflet to the other be so rare?

• A)Flippases are enzymes which are transiently stable and expressed at low concentrations.
• B)For flip-flop to occur, it would be necessary for the hydrophilic head of a phospholipid to move through the hydrophobic part of the bilayer, an extremely unlikely event.
• C)For flip-flop to occur, it would be necessary for the hydrophobic head of a phospholipid to move through the hydrophilic part of the bilayer, an extremely unlikely event.
• D)Other membrane activities like flexing and lateral shift inhibit phospholipid flip-flop.

Understand the healthcare and diagnostic procedures associated with confirming and monitoring pregnancy.

Understand the principles of social learning theory, including the concepts of observational learning and self-efficacy.

Grasp the basics of operant conditioning, including the definitions of operant behavior and reinforcement.

Analyze the shortcomings of classic behaviorism and its impact on personality development.

---

Definitions:

Impermeable Unit

A geological formation or material that does not allow fluids to pass through it.

Surface Water

Water that occurs in streams, rivers, lakes, oceans, and other settings on Earth’s surface.

Groundwater

Moisture trapped below the ground in the soil or within fissures and cavities of rocks.

Cross Section

A diagram or slice that shows the internal structure of a particular object or area, made by cutting or visualizing a cut through the object.