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Chapter 6: A Tour of the Cell Flashcards

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9211066947ProkaryoticA microscopic single-celled organism which has neither a distinct nucleus with a membrane nor other specialized organelles, including the bacteria and cyanobacteria.0
9211066948EukaryoticAn organism whose cells contain a nucleus surrounded by a membrane and whose DNA is bound together by proteins (histones) into chromosomes.1
9211066949CellThe smallest structural and functional unit of an organism.2
9211066950CellThe simplest collection of matter that can be alive.3
9211066951ProkaryoticThe organisms of the domains Bacteria and Archaea consist of _____________ cells.4
9211066952EukaryoticProtists, fungi, animals, and plants all consist of ________ cells.5
9211066953ProtistAn informal term referring to a group of mostly unicellular eukaryotes.6
9211066954Plasma membraneAll cells are bounded by a selective barrier called the:7
9211066955CytosolA semifluid jelly like substance contained in all cells:8
9211066956ChromosomesAll cells contain _______________________, which carry genes in the form of DNA.9
9211066957DNAAll cells contain chromosomes, which carry genes in the form of _________________.10
9211066958EukaryoticIn a ________________________ cell, most of the DNA is in an organelle called the nucleus, which is bounded by a double membrane.11
9211066959ProkaryoticIn a ______________________ cell, the DNA is concentrated in a region that is not membrane enclosed called the nucleoid.12
9211066960FimbriaeAttachment structures on the surface of some prokaryotes.13
9211066961FimbriaeWhat does the yellow represent?14
9211066962NucleoidRegion where the cell's DNA is located (not enclosed by a membrane).15
9211066963Nucleoid16
9211066964RibosomesComplexes that synthesize proteins17
9211066965Plasma membraneMembrane enclosing the cytoplasm.18
9211066966Plasma membrane19
9211066967Cell wallRigid structure outside the plasma membrane.20
9211066968CapsuleJellylike out coating of many prokaryotes.21
9211066969FlagellaLocomotion organelles of some bacteria22
9211066970FlagellaWhat are 6 objects coming off the cell called?23
9211066971EukaryoticMeans "true nucleus."24
9211066972ProkaryoticMeans "Before nucleus"25
9211066973CytoplasmThe interior of either a eukaryotic or prokaryotic cell is called the26
9211066974TrueIn a eukaryotic cell cytoplasm refers only to the region between the nucleus and the plasma membrane (T/F)27
9211066975FalseIn a prokaryotic cell cytoplasm refers only to the region between the nucleus and the plasma membrane (T/F)28
9211066976EukaryoticWithin the cytoplasm of a _______________________ cell, suspended in cytosol, are a variety of organelles of specialized form and function.29
9211066977FalseDue to the lack of organelles the prokaryotic cytoplasm is essentially a "formless soup." (T/F)30
9211066978Plasma membraneFunctions as a selective barrier that allows passage of enough oxygen, nutrients, and wastes to service the entire cell.31
9211066979TrueA smaller object has a greater ratio of surface area to volume. (T/F)32
9211066980FalseA larger object has a greater ratio of surface area to volume. (T/F)33
9211066981LessAs a cell grows its surface area grows proportionally ________ than its volume.34
9211066982FalseLarger organisms have slightly larger cells than smaller organisms, to provide efficiency. (T/F)35
9211066983TrueLarger organisms have more cells, not larger, as compared to a smaller organism. (T/F)36
9211066984TrueThe need for surface area sufficiently large to accommodate the volume helps explain the microscopic size of most cells and narrow, elongated shapes of others. (T/F)37
9211066985MicrovilliIncrease the surface area without an appreciable volume increase.38
9211066986EukaryoticThis type of cell has elaborately arranged internal membranes that divide the cell into compartments.39
9211066987Plasma membrane and organelle membranesParticipate directly in the cell's metabolism:40
9211066988PhospholipidsThe basic fabric of most biological membranes is a double layer of ______________________________.41
9211066989Proteins_______________ are embedded or attached to the surface of the lipid bilayer.42
9211066990CentrosomeRegion where the cell's microtubules are initiated, contains a pair of centrioles.43
9211066991CytoskeletonReinforces cell's shape, functions in cell movement. Components are made of protein.44
9211066992CytoskeletonMicrofiliments, intermediate filaments, and microtubules are all part of the ______________________.45
9211066993PeroxisomeOrganelle with various specialized metabolic functions; produces hydrogen peroxide as a by-product, then converts it to water.46
9211066994MitochondrionOrganelle where cellular respiration occurs and most ATP is generated.47
9211066995LysosomeDigestive organelle where macromolecules are hydrolyzed.48
9211066996Golgi apparatusOrganelle active in synthesis, modification, sorting, and secretion of cell products.49
9211066997Endoplasmic ReticulumNetwork of membranous sacs and tubes; active in membrane synthesis and other synthetic and metabolic processes; has rough and smooth regions.50
9211066998Nuclear envelopeDouble membrane enclosing the nucleus; perforated by pores, continuous with ER.51
9211066999NucleolusNonmembranous structure involved in production of ribosomes; has one or more nucleoli.52
9211067000ChromatinMaterial consisting of DNA and proteins; visible in dividing cell as individual condensed chromosomes.53
9211067001Cell wallOuter layer that maintains cell's shape and protects cell from mechanical damage, made of cellulose, other polysaccharides, and protein.54
9211067002PlasmodesmataCytoplasmic channels through cell walls that connect cytoplasms of adjacent cells.55
9211067003Central vacuoleProminent organelle in older plant cells; functions include storage, breakdown of waste products, and hydrolysis of macromolecules; enlargement of this structure is a major mechanism of plant growth.56
9211067004RibosomesUse information from the DNA to make proteins.57
9211067005NucleusHouses most of the cell's DNA and the ribosomes.58
9211067006NucleusContains most of the genes in the eukaryotic cell.59
9211067007Mitochondria and chloroplastsDisregarding the nucleus some genes can also be stored in the:60
9211067008Pore complexA collection of membrane-associated proteins that regulate the passage of large molecules between the cytoplasm and the cell nucleus.61
9211067009Nuclear laminaA netlike array of protein filaments that maintains the shape of the nucleus by mechanically supporting the nuclear envelope.62
9211067010Nuclear matrixA framework of protein fibers extending throughout the nuclear interior..63
9211067011ChromosomesStructures that carry the genetic information64
9211067012ChromatinThe complex of DNA and proteins making up chromosomes.65
9211067013ChromatinWhen a cell is not dividing stained ___________________ appears as a diffuse mass in micrographs and the chromosomes cannot be distinguished from each other even though discrete chromosomes are present.66
9211067014ChromosomesWhen a cell is not dividing stained chromatin appears as a diffuse mass in micrographs and the _______________________ cannot be distinguished from each other even though discrete chromosomes are present.67
9211067015ChromatinAs a cell prepares to divide the __________________ coil (condense) further, becoming thick enough to distinguished under a microscope as separate structures.68
9211067016TrueEach eukaryotic species has a characteristic of chromosomes. (T/F)69
9211067017FalseAll eukaryotic species have 46 chromosomes. (T/F)70
9211067018NucleolusPlural of nucleoli71
9211067019NucleolusA prominent structure within the nondividing nucleus. It appears through the electron microscope as a mass of densely stained granules and fibers adjoining part of the chromatin.72
9211067020RNAIs synthesized from instructions in the DNA.73
9211067021RibosomesMade of a special RNA and protein. Are the cellular components that carry out protein synthesis.74
9211067022RibosomesCells that have high rates of protein synthesis have particularly large numbers of __________________.75
9211067023Free_______ ribosomes are suspended in the cytosol.76
9211067024Bound________________ ribosomes are attached to the outside of the nuclear envelope or endoplasmic reticulum.77
9211067025TrueBound and free ribosomes are structurally identical and can even alternate between roles. (T/F)78
9211067026FalseBound and free ribosomes are structurally similar, but cannot alternate between roles. (T/F)79
9211067027FalseBound and free ribosomes are not structurally identical, but they can alternate between roles. (T/F)80
9211067028FreeMost of the proteins made on ___________ ribosomes function within the cytosol.81
9211067029Bound_____________ ribosomes generally make proteins that are destined for insertion into the membrane, for packaging within certain organelles such as lysosomes, or export from the cell (secretion).82
9211067030SecretionAlso known as export from the cell.83
9211067031Endomembrane systemIncludes the nuclear envelope, the endoplasmic reticulum, the golgi apparatus, lysosomes, various kinds of vesicles and vacuoles, and the plasma membrane.84
9211067032VesiclesSacs made of membrane.85
9211067033EndoplasmicMeans "within the cytoplasm"86
9211067034ReticulumMeans "little net"87
9211067035CisternaMeans "a reservoir for a liquid'88
9211067036LumenReferring to the channel within a tube.89
9211067037Endoplasmic reticulumAn extensive network of membranes that accounts for more than half of the total membrane in many eukaryotic cells.90
9211067038Endoplasmic reticulumConsists of network of membranous tubules and sacs called cisterna.91
9211067039Smooth endoplasmic reticulumIs so named because its outer surface lacks ribosomes.92
9211067040Rough endoplasmic reticulumIs so named because its outer surface is studded with ribosomes.93
9211067041GlycoproteinsProteins with carbohydrates covalently bonded to them.94
9211067042Transport vesiclesVesicles which are used in transit from one part of the cell to another.95
9211067043Golgi apparatusActs as "warehouse" for receiving, sorting, shipping, and even some manufacturing.96
9211067044Golgi apparatusIn this organelle products of the ER, such as proteins, are modified and store and then sent to other destinations.97
9211067045LysosomeA membranous sac of hydrolytiic enzymes that many eukaryotic cells use to digest (hydrolyze) macromolecules.98
9211067046PhagocytosisThe process by which a cell engulfs a solid particle to form an internal vesicle known as a phagosome.99
9211067047Food vacuoleA vacuole with a digestive function.100
9211067048VacuolesLarge vesicles derived from the endoplasmic reticulum and golgi apparatus.101
9211067049Central vacuoleGenerally contained by mature plant cells. Develops by the coalascence of smaller vacuoles. Plays a major role in the growth of plant cells102
9211067050MitochondriaAre the sites of cellular respiration.103
9211067051Cellular respirationThe chemical process that generates most of the energy in the cell, supplying molecules needed to make the metabolic reactions of an organism run.104
9211067052ChloroplastsThe sites of photosynthesis.105
9211067053Mitochondrial matrixThe substance occupying the space enclosed by the inner membrane of a mitochondrion; it contains enzymes, filaments of DNA, granules, and inclusions of protein crystals, glycogen, and lipid.106
9211067054ThylakoidsEach of a number of flattened sacs inside a chloroplast, bounded by pigmented membranes on which the light reactions of photosynthesis take place, and arranged in stacks or grana.107
9211067055GranumA stack of thylakoids is called a108
9211067056StromaThe fluid outside the thylakoids is called the109
9211067057PlastidsAny of a class of small organelles, such as chloroplasts, in the cytoplasm of plant cells, containing pigment or food.110
9211067058PeroxisomesA small organelle that is present in the cytoplasm of many cells and that contains the reducing enzyme catalase and usually some oxidases.111
9211067059CytoskeletonA network of fibers extending throughout the cytoplasm.112
9211067060Motor proteinsA class of molecular motors that are able to move along the surface of a suitable substrate. They convert chemical energy into mechanical work by the hydrolysis of ATP.113
9211067061MicrotubulesHollow tubes which function in maintenance of cell shape (compression resisting), cell motility (as cilia or flagella), chromosome movements in cell division, and organelle movements.114
9211067062MicrofilamentsTwo intertwined strands of actin which function in maintenance of cell shape (tension bearing elements), changes in cell shape, muscle contraction, cytoplasmic streaming in plant cells, cell motility (as amoeboid movement), and division of animal cells.115
9211067063Intermediate filamentsFibrous proteins coiled into cables which function in maintenance of cell shape (tension bearing elements), anchorage of nucleus and certain other organelles, and formation of nuclear lamina.116
9211067064MicrotubulesAll eukaryotic cells have __________________, hollow rods constructed from a globular protein called tubulin.117
9211067065DimersMicrotubules grow in length by adding tubulin _________.118
9211067066TrueMicrotubules can be disassembled and have their tubulin used to build microtubules elsewhere in the cell. (T/F)119
9211067067CentrosomeIn animal cells tubules grow out from a ___________________.120
9211067068Centrioles.Within the centrosome is a pair of ________________, ach composed of nine sets of triplet microtubules arranged in a ring.121
9211067069CiliaMinute hairlike organelles, identical in structure to flagella, that line the surfaces of certain cells and beat in rhythmic waves, moving liquids along internal epithelial tissue in animals.122
9211067070Organelleany of a number of organized or specialized structures within a living cell.123
9211067071cismeans "on the same side"124
9211067072Cis face"Recieving" department of the Golgi apparatus. Usually located near the ER.125
9211067073Trans face"Shipping" department of the Golgi apperatus.126
9211067074CisternaRefers to a flattened membrane disk that makes up the endoplasmic reticulum and Golgi apparatus127
9211067075MedialThe area between the cis face and trans face of the Golgi apparatus is known as the the _____________ Golgi.128
9211067076FlagellumHas an undulating motion like the tail of a fish.129
9211067077CiliaWorks more like oars, with alternating power and recovery strokes.130
9211067078CiliumA ____________ may also act as a signal receiving "antenna" for the cell. However there is only one per cell and it is generally motile.131
9211067079DesmosomeA structure by which two adjacent cells are attached, formed from protein plaques in the cell membranes linked by filaments.132
9211067080Desmosome133
9211067081Gap junctionSpecialized intercellular connection between cells.. They directly connect the cytoplasm of two cells, which allows various molecules, ions and electrical impulses to directly pass through a regulated gate between cells.134
9211067082Gap junction135
9211067083Tight junctionClosely associated areas of two cells whose membranes join together forming a virtually impermeable barrier to fluid.136
9211067084Tight junction137
9211067085Contractile vacuoleA membrane-enveloped cellular organelle, found in many microorganisms, that periodically expands, filling with water, and then contracts, expelling its contents to the cell exterior: thought to be important in maintaining hydrostatic equilibrium.138
9211067086TubulinA dimer consisting of α-tublin and β-tubulin139
9211067087ActinA protein found in all eukaryotic cells, forming filaments that make up a main component of the cell's supporting matrix or cytoskeleton.140
9211067088Plasmodesmata141
9211067089CristaeEach of the partial partitions in a mitochondrion formed by infolding of the inner membrane.142
9211067090MatrixIs the material (or tissue) in animal or plant cells, in which more specialized structures are embedded, and a specific part of the mitochondrion that is the site of oxidation of organic molecules.143
9211067091Intermembrane spaceThe region between the inner membrane and the outer membrane of a mitochondrion or a chloroplast.144
9211067092TrueEukaryotic cells can be larger than prokaryotic cells. (T/F)145
9211067093Eukaryotic_____________ cells have a membrane bound nucleus.146
9211067094Prokaryotic______________ cells do not have a membrane bound nucleus147
9211067095ProkaryoticIn _________________ cells, cell walls are made of peptidoglycan (the thickness of which depends on whether the cell is gram+ or gram-)148
9211067096EukaryoticIn ____________ cells, cell walls if they are present are made of cellulose (chitin in fungi).149
9211067097ProkaryoticHave pili & fimbriae (for adhesion) and flagella (for propulsion)150
9211067098EukaryoticHave cilia or flagella for movement.151
9211067099TrueBoth plant and animal cells are prokaryotic and therefore are similar. (T/F)152
9211067100FalseBoth plant and animal cells have cell walls. (T/F)153
9211067101TruePlant cells have a rigid rectangular shape while animal cells have a round irregular shape. (T/F)154
9211067102Centrioles_____________ are present in all animal cells, but only in lower plant forms.155
9211067103CiliaMost plant cells do not contain (specific structure).156
9211067104PlantIn ____________ cells, the function of vacuoles is to store water and maintain turgidity of the cell.157
9211067105AnimalVacuoles in ___________ cells store water, ions and waste.158
9211067106AnchoringAdherens junctions, desmosomes, and hemidesmosomes are examples of __________________ junctions.159
9211067107CommunicatingA gap junction is an example of a _______________________ junction.160
9211067108OccludingA tight junction is an example of a _________________ junction.161

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