Lipids accomplish many different functions, such as energy provision, structure, and insulation, among others. However, they are not in control of metabolic functions. Therefore the answer is D.
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Lipids are amphipathic molecules with hydrophilic heads -negatively charged phosphate group- and hydrophobic tails.
Lipids are involved in several functions. Among others, we can mention,
In the organism, lipids constitute the energetic reserve of late or differed use. These are in the triacylglycerol form. Their caloric content is very high and represents a significant source of energy storage.
Aerobic combustion of lipids produces a great metabolic water quantity. Some desertic animals -camels- store fat in their tissues to produce water when needed.
Some other animals produce a specialized adipous tissue called brown fat. Lipidic combustion in these tissues is decoupled from oxidative phosphorylation. Most of the energy derived from combustion is used for heat production.
Hybernating animals use this brown fat to produce energy during the long hibernation periods.
Two lipidic bilayers compose the cell membrane. They are arranged with their hydrophilic polar heads facing the exterior and the interior of the cells, while their hydrophobic tails are against each other, constituting the internal part of the membrane. They can also provide protection and isolation for specialized tissues and organs.
Lipids are involved in cell signals. They control the fluidity of membranes in the central and peripheral nervous systems, playing a role in electrical signals transmission and synapses.
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