Biol 1408 Chapter 4 (A Tour of the Cell) Lecture

Biol 1408 Chapter 4 (A Tour of the Cell) Lecture - A Tour...

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A Tour of the Cell Microscopy Allows us to visualize very small structures, compounds, or organisms Variety of different types of microscopes Used in lab: Compound Light Microscope Light Compound Microscope Can Magnify up to 1000X
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Limitations Some structures are too small for even a Light Compound Microscope to visualize Other types of microscopes Fluorescent Microscope Confocal Microscope TEM (Transmission Electron Microscope) SEM (Scanning Electron Microscope) Fluorescent Microscope Confocal Microscope Electron Microscope
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Human height Length of some nerve and muscle cells 10 m Frog egg Chicken egg Unaided eye 1 m 100 mm (10 cm) 10 mm (1 cm) 1 mm Light microscope Electron microscope 100 nm 100 ! m 10 ! m 1 ! m Most plant and animal cells Viruses Nucleus Most bacteria Mitochondrion 10 nm Lipids Ribosome Proteins Mycoplasmas (smallest bacteria) 1 nm Small molecules 0.1 nm Atoms
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Most cells cannot be seen without a microscope Plant and animal cells typically require a magnification of about 100X to visualize Bacteria, the smallest of cells require 1000X Bacteria & Archae Pro Before karyotes Karyon (Greek) for nut or kernel; i.e. the nucleus is the “kernel” or center of the cell. Much smaller cells that lack a ____________ Nucleus Fungi, Plant & Animal Cells Eu New karyotes Karyon (Greek) for nut or kernel; i.e. the nucleus is the “kernel” or center of the cell. Much larger cells that possess a ____________ Nucleus and membrane bound organelles.
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Nucleoid Ribosomes Plasma membrane Cell wall Capsule Flagella Bacterial chromosome A typical rod-shaped bacterium Pili A thin section through the bacterium Bacillus coagulans (TEM) Prokaryotes Eukaryotes Smooth endoplasmic reticulum Rough endoplasmic reticulum CYTOSKELETON: NUCLEUS: Nuclear envelope Chromosomes Nucleolus Ribosomes Golgi apparatus Plasma membrane Mitochondrion Peroxisome Centriole Lysosome Microtubule Intermediate filament Microfilament Smooth endoplasmic reticulum Rough endoplasmic reticulum CYTOSKELETON: NUCLEUS: Nuclear envelope Chromosome Nucleolus Ribosomes Golgi apparatus Plasma membrane Mitochondrion Peroxisome Cell wall Central vacuole Microtubule Intermediate filament Microfilament Cell wall of adjacent cell Chloroplast Plasmodesmata Animal Plant Size Difference Between Pro & Eukaryotes
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Smooth endoplasmic reticulum Rough endoplasmic reticulum CYTOSKELETON: NUCLEUS: Nuclear envelope Chromosomes Nucleolus Ribosomes Golgi apparatus Plasma membrane Mitochondrion Peroxisome Centriole Lysosome Microtubule Intermediate filament Microfilament Smooth endoplasmic reticulum Rough endoplasmic reticulum CYTOSKELETON: NUCLEUS: Nuclear envelope Chromosome Nucleolus Ribosomes Golgi apparatus Plasma membrane Mitochondrion Peroxisome Cell wall Central vacuole Microtubule Intermediate filament Microfilament Cell wall of adjacent cell Chloroplast Plasmodesmata The plasma membrane controls the movement of molecules into and out of the cell, a trait called selective permeability (More on this in UNIT 6 Lab) -
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