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Cell Structure (Cell Characteristics (Prokaryotic (No membrane bound…
Cell Structure
Cell Characteristics
Prokaryotic
No membrane bound organelles; nucleus, mitochondria, ER, golgi, etc.
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Eukaryotic
Plants, animals, fungi, protists
Has membrane bound nucleus #
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Membranes
Functions
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Regulate passage of molecules in/out of cells/organelles #
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Properties
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Exocytosis: using vesicles to excrete materials out the surface membrane to the exterior #
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Constantly changing, dynamic based on needs of cell
Organelles
Plant Cells Only
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Plastids #
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Proplastids: young, meristematic cells
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Chloroplasts: chlorophyll rich, carries out photosynthesis, has own DNA
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Granum: flat vesicles, staked, carry out chemiosmotic phosphorylation
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Central Vacuole: membrane bound (tonoplast) which stores water, calcium, potassium, pigments, metabolic wastes, etc. #
Aids in cell growth, larger it gets
Animal and Plant Cells
Protoplasm: all substance of cell, not including cell wall
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Cytosol: liquid substance of protoplasm, not including organelles
Cytoplasm: protoplasm, includes nucleus, vacuoles, and cytoplasm
Nucleus: houses DNA
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Nuclear Pores: in envelope, transport materials between nucleus and cytoplasm
Nucleoplasm: substance inside nucleus, includes DNA, histones, RNA, enzymes, nucleic acids, and water
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Mitochondria: aerobic respiration, ATP synthesis
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Endoplasmic Reticulum
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Rough: ribosomes attached, protein synthesis
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Golgi apparatus: collection of dictyosomes, packages materials for transportation
Animal Cells Only
Lysosomes: contain digestive enzymes, recycles components
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Cytoskeleton
Microtubules: reinforcement of cell shape, helps motility
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Examples;
Cilia: used for movement, similar to flagella, only shorter
9+2 arrangement of microtubules in cilia and flagella:
Flagella: used for locomotion, sperm cells
Basal Body: similar to centrioles #
Microfilaments: actin, movement of organelles other than flagella, cilia, and chromosomes
Cell Wall: plant cells only, layer outside for plasma membrane #
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Primary Cell Wall: plant cells, during division, thin
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Secondary Cell Wall: sclerenchyma cells, after division, interior to primary, contains lignin
Fungal cells: do not have cellulose in cell wall, but chitlin, do not contain plastids #