1.2 Eukaryotes IB Biology HL 1 Mrs. Peters Fall 2014.
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Transcript of 1.2 Eukaryotes IB Biology HL 1 Mrs. Peters Fall 2014.
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1.2 EukaryotesIB Biology HL 1Mrs. PetersFall 2014
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A&S 4: Eukaryote: Liver Cell Drawing
• Draw and label a liver cell.
• Must be able to identify the following parts:▫Cell Membrane▫Nucleus w/nuclear
envelope▫Rough ER▫Golgi Apparatus▫Mitochondria▫Lysosome
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U 2.Eukaryotes•Specific Characteristics:
▫Contain membrane bound organelles (internal structures with specific functions)
▫True nucleus with DNA▫80s Ribosomes▫Relative size ~20 µm
•Types of Eukaryotes:▫Animal cells▫Plant cells▫Fungi cells▫(we will focus on animal and plant cells only)
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U2. Eukaryotic CellsAnimal Cell Plant Cell
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U2. Common Eukaryote Structures• *Nucleus: controls cell
functions▫ Largest organelle of the
cell
Parts of the nucleus:• Nuclear envelope with
nuclear pores: a double membrane surrounding the nucleus
micro.magnet.fsu.edu
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U2. Common Eukaryote StructuresParts of the nucleus:• *Nucleolus: produces
ribosomes• DNA (chromosome,
chromatin): contains the genetic information for the cell; combined with protein
micro.magnet.fsu.edu
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U2. Common Eukaryote Structures
• Endoplasmic Reticulum (ER): series of membranes continuous with the nuclear envelope
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U2. Common Eukaryote Structures
• Types:▫ *Rough ER: has
ribosomes attached; transport system for proteins
▫ Smooth ER: no ribosomes attached; produces phospholipids, lipids, breaks down toxins
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U2. Common Eukaryote Structures• *Golgi Apparatus:
collects, packages, modifies and transports proteins; a series of flattened, folded membranes
micro.magnet.fsu.edu
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U2. Common Eukaryote Structures
• *Mitochondria: site of cellular respiration; known as the powerhouse; kidney bean shaped, consists of a double membrane, inner membrane has many folds
micro.magnet.fsu.edu
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U2. Common Eukaryote Structures• *Ribosomes: site of
protein synthesis; can be free or attached to RER; known as 80S
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U2. Common Eukaryote Structures
• *Plasma Membrane: controls the movement of material in and out of the cell, provides a barrier around the cell
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U2. Plant Only Structures
• Chloroplast: site of photosynthesis, consists of a double membrane
• Central Vacuole: helps give the cell its shape, a sack like structure that contains water and salts
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U2. Plant Only Structures
•Cell Wall: rigid outer boundary that provides strength and support for the plant; composed of cellulose
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U2. Animal Only Structures• *Lysosomes: break
down worn out cell parts and waste; small sacks that contain enzymes
• Centrioles: form microtubules used in cell division; shaped
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U2. Extracellular ComponentsAnimal Cell:• Extracellular matrix
(ECM) forms a supporting network for the cell membrane and allows adjacent cells to attach to one another and communicate; made of collagen fibers and glycoproteins
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U2. Extracellular Components
Plant Cell: • The cell wall forms the ECM;
made up of cellulose fibers and glycoproteins; maintains cell shape, allows cell to communicate and bind to other cells
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U 2.Plant Cell vs. Animal Cell
Structure/Feature Plant Cell Animal Cell
Cell Wall Present Absent
VacuolesLarge Central
VacuoleSmall vacuoles
sometimes
Chloroplast Present Absent
Cell membrane (Plasma membrane)
Present, no cholesterol
Present, with cholesterol
Centrioles Absent Present
Storage Stores starch Stores glycogen
ShapeOften squarish, very
rigidOften more round,
flexibleLysosome Absent Present
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U1 & 2. Prokaryote vs. Eukaryote
Structure/Feature Prokaryote Cell Eukaryote Cell
Nucleuscontains a nucleoid region, no envelope
Present, surrounded by nuclear envelope
Membrane-Bound Organelles
Not present
Present (mitochondria,
chloroplast, ER, Golgi, etc)
DNANaked (no proteins), 1 circular strand, plasmid
present
Associated with proteins, long strands,
no plasmids
Ribosomes Relatively small, 70S Relatively large, 80S
Cell Wall Always present Only in plant cells
Flagella Sometimes Sometimes
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Microscope Practice 3View all 4 slides at 40X, 100X, and 400X;
Label each box correctly, fill the square! Don’t forget to clean up when finished! Turn in all microscope drawings (1, 2 and 3) stapled together.
Slides to make:▫Onion: take a single layer of onion, add one
drop of iodine to the onion, NO WATER DROP▫Cheek Cells: use a toothpick to gently scrape
the inside of your cheek, smear the toothpick on a slide, add one drop of Methylene blue, NO WATER DROP