Proteins & Lipids Functions in Living Organisms

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Proteins and lipids serve essential roles in living organisms, with both acting as energy sources. However, they differ significantly in their composition and structure, which influences their specific functions. Proteins are composed of amino acids and are crucial for building and repairing tissues, as well as facilitating biochemical reactions as enzymes. Lipids, made up of fatty acids and glycerol, are important for energy storage, cell membrane structure, and signaling. Understanding these distinctions clarifies why proteins and lipids are suited for their respective roles in biological systems.
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Homework Statement



Proteins and lipids have some similar but also some different functions in living organisms. Describe these functions and explain why proteins and lipids are suitable for these functions.
(It is a question for F.4)

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The Attempt at a Solution



I only knew the similarity of lipids and proteins is they both are energy source. And the difference is they are made up of different elements and have different structure. That is all I knew. How can I explain why proteins and lipids are suitable for these functions? Help~~~~
 
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TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
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