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Biology in Focus (AP) Chapter 4 Flashcards

Adapted from:
Urry, L., Cain, M., Wasserman, S., Minorsky, P., Jackson, R., & Reece, J. (2014). Campbell biology in focus. Boston: Pearson Education, Inc. (ISBN# 0321813804)

Terms : Hide Images
4929162440Central vacuoleA membranous sac in a mature plant cell with diverse roles in reproduction, growth, and development0
4929162441CentrosomeStructure present in the cytoplasm of animal cells, important during cell division; functions as a microtubule-organizing center; has two centrioles.1
4929162442ChloroplastAn organelle found in plants and photosynthetic protists that absorbs sunlight and uses it to drive the synthesis of organic compounds from carbon dioxide and water.2
4929162443ChromatinThe complex of DNA and proteins that makes up a eukaryotic chromosome.3
4929162444ChromosomeA cellular structure carrying genetic material, found in the nucleus of eukaryotic cells.4
4929162445Contractile vacuoleA membranous sac that helps move excess water out of certain freshwater protists.5
4929162446CytoplasmThe contents of the cell, exclusive of the nucleus and bounded by the plasma membrane.6
4929162447CytoskeletonA network of microtubules, microfilaments, and intermediate filaments that branch throughout the cytoplasm and serve a variety of mechanical, transport, and signaling functions.7
4929162448Endomembrane systemThe collection of membranes inside and around a eukaryotic cell, related either through direct physical contact or by the transfer of membranous vesicles; includes the smooth and rough endoplasmic reticulum, the Golgi apparatus, lysosomes, and vacuoles.8
4929162449Endoplasmic reticulumAn extensive membranous network in eukaryotic cells, continuous with the outer nuclear membrane and composed of ribosome-studded (rough) and ribosome-free (smooth) regions.9
4929162450FlagellumA long cellular appendage specialized for locomotion.10
4929162451Golgi apparatusAn organelle in eukaryotic cells consisting of stacks of flat membranous sacs that modify, store, and route products of the endoplasmic reticulum and synthesize some products, notably noncellulose carbohydrates.11
4929162452LysosomeA membrane-enclosed sac of hydrolytic enzymes found in the cytoplasm of animal cells and some protists.12
4929162453MicrofilamentA cable composed of actin proteins in the cytoplasm of almost every eukaryotic cell, making up part of the cytoskeleton and acting alone or with myosin to cause cell contraction; also known as an actin filament.13
4929162454MicrotubuleA hollow rod composed of tubulin proteins that makes up part of the cytoskeleton in all eukaryotic cells and is found in cilia and flagella.14
4929162455MitochondrionAn organelle in eukaryotic cells that serves as the site of cellular respiration; uses oxygen to break down organic molecules and synthesize ATP.15
4929162456Nuclear envelopeThe double membrane in a eukaryotic cell that encloses the nucleus, separating it from the cytoplasm.16
4929162457NucleoidA non-membrane-bounded region in a prokaryotic cell where the DNA is concentrated.17
4929162458NucleolusA specialized structure in the nucleus, consisting of chromatin regions containing ribosomal RNA genes along with ribosomal proteins imported from the cytoplasmic site of rRNA synthesis and ribosomal subunit assembly. See also ribosome.18
4929162459NucleusThe chromosome-containing organelle of a eukaryotic cell.19
4929162460PeroxisomeAn organelle containing enzymes that transfer hydrogen (H2) from various substrates to oxygen (O2), producing and then degrading hydrogen peroxide (H2O2).20
4929162461Plasma membraneThe membrane at the boundary of every cell that acts as a selective barrier, regulating the cell's chemical composition.21
4929162462RibosomeA complex of rRNA and protein molecules that functions as a site of protein synthesis in the cytoplasm.22
4929162463Rough ERThat portion of the endoplasmic reticulum studded with ribosomes. A network of interconnected membranous sacs in a eukaryotic cell's cytoplasm; covered with ribosomes that make membrane proteins and secretory proteins.23
4929162464Smooth ERThat portion of the endoplasmic reticulum that is free of ribosomes. Detoxifies and builds lipids. Is ER that does not have ribosomes attached. It is a major site of lipid synthesis.24
4929162465Transport vesicleA tiny membranous sac in a cell's cytoplasm carrying molecules produced by the cell.25
4929162466cell walla rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants, it consists mainly of cellulose.26
4929162467ciliaHairlike projections that extend from the plasma membrane and are used for locomotion27
4929162468flagellaA long, whip-like filament that helps in cell motility. Many bacteria are flagellated, and sperm are flagellated.28

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