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Vocabulary flashcards covering key structures listed in Table 4.1 for animal and plant cells.
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Cell wall
Provides support and protection; contains cellulose fibrils.
Plasma membrane
Phospholipid bilayer with embedded proteins; regulates entry and exit of molecules.
Nucleus
Stores genetic information; enclosed by a nuclear envelope; site of DNA and RNA synthesis.
Nucleolus
Concentrated region within the nucleus where ribosome subunits are produced.
Ribosome
Protein and RNA complex that synthesizes proteins; composed of two subunits.
Endoplasmic reticulum (ER)
Membranous network of channels; site of protein and lipid synthesis; includes rough and smooth ER.
Rough endoplasmic reticulum (Rough ER)
ER studded with ribosomes; synthesizes proteins destined for secretion or membranes.
Smooth endoplasmic reticulum (Smooth ER)
ER lacking ribosomes; synthesizes lipids and detoxifies certain substances.
Golgi apparatus
Processes, packages, and distributes proteins and lipids via vesicles.
Vesicle/vacuole
Membrane-bound sac that stores and transports substances.
Lysosome
Vesicle containing hydrolytic enzymes; digests macromolecules and cellular components.
Peroxisome
Vesicle containing enzymes; breaks down fatty acids and detoxifies hydrogen peroxide.
Mitochondrion
Produces energy (ATP) via cellular respiration; has a double membrane with cristae.
Chloroplast
Site of photosynthesis; contains thylakoids; double membrane.
Cytoskeleton
Network of microtubules, intermediate filaments, and actin filaments that maintains shape and supports movement.
Cilia and flagella
Hair-like structures that move the cell or surrounding substances; supported by microtubules.
Centrioles (centrosome)
Organize microtubules for cilia/flagella formation; centrosome organizes microtubules during cell division.