1. Cell membrane Signal transduction
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Cell Structure
Cell Structure 2 1 3 4 5 6 8 7 9 10 11 12 13
The boundary surrounding the cellular contents that regulates movement of substances in and out of the cell, and helps cells adhere to certain other cells
Cell membrane
Signal transduction
A process through which the cell can interact with other cells

2. Endoplasmic reticulum
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An organelle that provides a tubular network used to transport molecules from one cell part to another; the site of protein and lipid synthesis
Endoplasmic reticulum
(ER)
Structures on the outside of the ER that are composed of protein and RNA; they provide enzymatic activity and structural support when proteins are formed
Ribosomes
A stack of six flattened, membranous sacs that function to refine and package the proteins synthesized by the ribosomes; these sacs receive and produce vesicles
Golgi apparatus

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Elongated, fluid-filled sacs with a folded inner layer; these are major sites that capture and store energy within the chemical bonds of ATP
Mitochondrion
Tiny, membranous sacs that contain powerful enzymes that are capable of breaking down molecules of nutrients or
foreign particles
Lysosome
Membranous sacs that are abundant in liver and kidney cells; they house enzymes that catalyze biochemical reactions
Peroxisomes

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This organelle is located in the cytoplasm near the Golgi apparatus and nucleus.; it is nonmembranous and consists of centrioles that distribute chromosomes to new cells during cell division (mitosis)
Centrosome
Bubble-like membranous sacs in the cytoplasm formed by part of the cell membrane folding inward and pinching off; contains some liquid or solid material formerly outside the cell
Vesicles

5. Nucleus Nucleolus Chromatin
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Nucleus
This cell component houses the DNA that directs all cell activities
A small, dense body composed largely of RNA and protein
Nucleolus
Loosely coiled fibers composed of DNA molecules and protein that contain information for synthesizing proteins
Chromatin

6. Deoxyribonucleic Acids
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This organic substance (usually a single polynucleotide chain) controls access to genes and carries out protein synthesis
Ribonucleic Acid
(RNA)
Deoxyribonucleic Acids
(DNA)
This organic substance (usually a double polynucleotide chain) stores information in a code and synthesizes protein molecules