api/deki/files/44703/Plant_cell_wall_diagram-en.svg.png?revision=1&size=bestfit&width=671&height=388" />Figure (PageIndex2): A diagram of the primary cell wall, including the plasma membrane and middle lamella. The primary wall is composed of crisscrossing cellulose and hemicellulose microfibrils. Strands of pectin and some soluble proteins are also in the mix. Diagram by LadyofHats, Public domain, via Wikimedia Commons.
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Figure (PageIndex3): A generalized diagram of a plasma membrane. The cell membrane, also called the plasma membrane or plasmalemma, is a semipermeable lipid bilayer common to all living cells. It contains a variety of dearteassociazione.orglogical molecules, primarily proteins and lipids, which are involved in a vast array of cellular processes. It also serves as the attachment point for both the intracellular cytoskeleton and, if present, the cell wall. Diagram by LadyofHats, Public domain, via Wikimedia Commons.
Plasmodesmata are channels through the cell wall and middle lamella where the plasma membrane of adjacent cells (and therefore the cytoplasm) is connected.
Figure (PageIndex4): The image above shows cells in the epidermis of a red pepper. Two locations are circled and labeled as plasmodesmata. In each of these circles, there is a section of the cell wall that appears to be missing. This is where a section of the plasma membrane traverses through a channel in the middle lamella and cell walls of both cells. Photo by Maria Morrow, CC BY-NC.
Figure (PageIndex5): A micrograph of a cell nucleus. The nucleolus (A) is a condensed region within the nucleus (B) where ribosomes are synthesized. The nucleus is surrounded by the nuclear envelope (C). Just oustide the nucleus, the rough endoplasmic reticulum (D) is composed of many layers of folded membrane. Image from the public domain, via Wikimedia Commons, labels added by Maria Morrow.
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Figure (PageIndex6): The large, golden, globose structure is an onion cell nucleus, magnification 3000x. Berkshire Community College dearteassociazione.orgscience Image Library, CC0, via Wikimedia Commons.
Chloroplasts are plastids that contain green pigments called chlorophylls.