Final answer:
The plasma membrane contains proteins that can be found on its surface or embedded within its structure. The extra layer of epidermis on the palms and soles is indeed on the outer surface. High-voltage power lines are not wrapped in insulating material as they are insulated by the air.
Step-by-step explanation:
Plasma Membrane Components
The plasma membrane is a critical part of a cell, controlling the entry and exit of substances. Among its components, proteins play various roles and can be found either on the surface of the membrane or embedded within its structure. These proteins include integral proteins, which span the membrane, and peripheral proteins, which are attached to either the inner or outer surface of the lipid bilayer.
Epidermis of Hands and Feet
As for the statement about the epidermis on the palms and soles, it is True. The epidermis in these areas does have an extra layer, known as the stratum lucidum, which is located on the outer surface of the skin, contributing to the thickened, tough nature of skin in these regions.
High-Voltage Power Lines
In regard to the high-voltage wires, it is False that these wires are wrapped in insulating material. High-voltage wires are typically not covered with insulating material because the air provides natural insulation, and it would be impractical to cover them due to their high voltage and the large distance they span.