cell structure and function...cell structure and function (topics 2.1 - 2.2, 2.10 - 2.11) by the end...
TRANSCRIPT
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Cell Structure and Function(Topics 2.1 - 2.2, 2.10 - 2.11)
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By the end of this presentation, you should be able to:
Distinguish between prokaryotic and eukaryotic cells
Explain the function of the cell parts
Explain how organelles work together to carry out specific cellular functions
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Cells Are the Fundamental Units of Life
All organisms are made of cells
Cells are descended from other cells
Cells share common features
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Prokaryotic and Eukaryotic Cells
All living organisms are composed of one of two types of cells: prokaryotic or eukaryotic
Prokaryotic: Domains Bacteria and Archaea
Eukaryotic: Protists, fungi, animals, and plants
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Comparing Prokaryotic and Eukaryotic Cells
All cells have:
Cell membrane
Cytosol
Chromosomes (DNA)
Ribosomes
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© 2014 Pearson Education, Inc.
Compartmentalization and Origins of Cell
Compartmentalization
Topics 2.10 and 2.11
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Prokaryotic cells generally lack internal membrane-bound organelles, but do have internal regions with specialized structures and functions
DNA is located in a region called the nucleoid
All bacteria consist of a single prokaryotic cells
Prokaryotic Cells
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Prokaryotic Cell
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Eukaryotic cells are characterized by having
DNA in a membrane-bound nucleus
Membrane-bound organelles
Eukaryotic cells are generally much larger than prokaryotic cells
Eukaryotic Cells
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Eukaryotic Cells
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Membrane-bound organelles evolved from once free-living prokaryotic cells via endosymbiosis
Evidence supporting endosymbiosis includes:
Organelles enveloped by double membranes
Organelles that contain ribosomes and circular DNA molecules
Organelles that grow and reproduce independently within cells
The Evolutionary Origins of Organelles
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© 2014 Pearson Education, Inc.
Theory of Endosymbiosis(watch this video)
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Organelles
Membranes and membrane-bound organelles in eukaryotic cells compartmentalize intracellular metabolic processes and specific enzymatic reactions
Internal membranes facilitate cellular processes by minimizing competing interactions and by increasing surface areas where reactions can occur
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© 2014 Pearson Education, Inc.
Cell Structure: Subcellular Components and Functions
Topics 2.1 and 2.2
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Structure of cell membranes results in selective permeability
Separates the internal environment of the cell from the external environment
Consists of a double layer of phospholipids, embedded proteins, steroids, glycoproteins and glycolipids
Cell Membrane
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Cell Membrane
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Nucleus
Contains most of the cells genetic information (genes)
Enclosed by a nuclear envelope (contains pores to allow materials to pass in and out of the nucleus)
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DNA is organized into chromosomes
Chromosomes consist of chromatin: DNA and proteins
Chromatin condenses to form chromosomes during cell division
The nucleolus is located within the nucleus and is the site of ribosomal RNA (rRNA) synthesis
Within the Nucleus
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Ribosomes
Ribosomes are composed of ribosomal RNA (rRNA) and protein
Ribosomes synthesize protein according to mRNA sequence
Found in all forms of life, reflecting common ancestry of all known life
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Endomembrane System
Regulates protein traffic and performs metabolic functions in the cell
Components of the endomembrane system: nuclear envelope, ER, Golgi apparatus, lysosome, vacuoles, plasma membrane
Components are either continuous or connected through transfer by vesicles
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Endoplasmic Reticulum (ER)
The ER membrane is continuous with the nuclear envelope
Occurs in two forms:
Smooth ER: lacks ribosomes
Rough ER: ribosomes on surface
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Functions of Smooth ER
Synthesizes lipids such as cholesterol, steroid hormones and phospholipids
Detoxification of metabolic wastes and harmful chemicals
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Functions of Rough ER
Provides site-specific protein synthesis
Distributes proteins surrounded by membranes in transport vesicles
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Consists of a series of flattened membrane sacs
Functions of the Golgi apparatus include:
Correct folding and chemical modification of newly synthesized proteins
Transport and movement of proteins throughout the cell or from the cell to the extracellular environment (protein trafficking)
Golgi Complex
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Lysosomes
Lysosomes are membrane-enclosed sacs that contain hydrolytic enzymes
Functions include intracellular digestion, the recycling of a cell’s organic materials, and programmed cell death (apoptosis)
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Lysosomal Intracellular Digestion
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Vacuoles
Vacuoles have many roles, including:
Storage and release of macromolecules and cellular waste products
Retention of water for turgor pressure in plants
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Mitochondria
Double membrane
The outer membrane is smooth, but the inner membrane is highly convoluted, forming folds
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Mitochondria and Cellular Respiration
Foldings of the inner membrane increase the surface area, which allows for more ATP to be synthesized during cellular respiration
Krebs cycle (citric acid cycle) reactions occur in the matrix of the mitochondria
Electron transport and ATP synthesis occur on the inner mitochondrial membrane
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Mitochondria and Cellular Respiration
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Chloroplast
Specialized organelles that are found in photosynthetic algae and plants
Double membrane
Within the chloroplast are thylakoids and stroma
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Chloroplast and Photosynthesis
Membranes contain chlorophyll pigments and electron transport proteins that comprise photosystems
Light-dependent reactions of photosynthesis occur in the grana
Carbon fixation (Calvin-Benson cycle) reactions of photosynthesis occur in the stroma
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Chloroplast and Photosynthesis
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Cytoskeleton
A network of fibers extending throughout the cytoplasm
Organizes the cell’s structures and activities, anchoring many organelles, supports and maintains shape of cell
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Roles of the Cytoskeleton
Interacts with motor proteins to transport vesicles and other organelles along the “tracks” of the cytoskeleton
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The Cell: A Living Unit Greater Than the Sum of Its Parts
Cellular functions arise from cellular order
Example: a macrophage’s ability to destroy bacteria involves the whole cell, coordinating components such as the cytoskeleton, lysosomes, and plasma membrane
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There is no “I” in “TEAM”
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TEAM WORK makes the DREAM WORK