Compound Building Blocks Functions Examples
Carbohydrates Simple sugar Provide energy, cell structure Glucose, starch
Lipids Glycerol, fatty acids Provide energy, cell structure Triglycerides, phospholipids, steroids
Proteins Amino Acids Provide cell structure, enzymes, energy Albumins, hemoglobin
Nucleic Acids Nucleotides Store information for the synthesis of proteins, control cell activities RNA, DNA
Organelle Structure Function
Cell membrane Membrane mainly composed of protein and lipid molecules Maintains integrity of the cell, controls the passage of materials into and out of the cell, and provides for signal transduction.
Ribosomes Particles composed of protein and RNA molecules Synthesize proteins
Golgi apparatus Group of flattened, membranous sacs Packages and modifies protein molecules for transport and secretion
Nucleolus Dense, nonmembranous body composed of protein and RNA molecules Site of ribosome formation
Chromatin Fibers composed of protein and DNA molecules Contains cellular information for synthesizing proteins

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