Question

How thick is the plasma membrane?

Choose one:
A. 50 μm
B. 50 mm
C. 50 atoms
D. 50 meters
E. 50 nm

Answer 1

The plasma membrane is 5 to 10 nm thick, making option E. 50 nm the closest correct choice for its thickness.

Step-by-step explanation:

The thickness of the plasma membrane is a crucial aspect of its structure and function. According to the fluid mosaic model proposed by Singer and Nicolson, the plasma membrane's structure can be described as a combination of various components like phospholipids, cholesterol, proteins, and carbohydrates which allow it to maintain fluidity and function effectively. The correct measurement for the thickness of plasma membranes is that they range from 5 to 10 nm (nanometers) in thickness.

Given the options provided for the thickness of the plasma membrane, the most accurate answer is E. 50 nm. For a more tangible comparison, human red blood cells are approximately 8 µm (micrometers) wide, which is about 1,000 times wider than the thickness of a plasma membrane.