Domain 2: Matter - Ms. Rooney's AP...
Transcript of Domain 2: Matter - Ms. Rooney's AP...
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Domain 2: Matter
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1. MATTER EXCHANGE
2.1: Organisms must exchange matter with the environment to grow, reproduce and maintain organization.
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Matter Cycles The atoms in living systems are common on this planet. Living systems are mostly made of 6 elements (CHNOPS) and a handful of other “trace” elements.
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Carbon Role: The major structural atom in all organic molecules. Major abiotic source: The atmosphere (as CO2). Major biotic processes: Incorporated in to producers through photosynthesis, returned back to the environment through cellular respiration, and decomposition.
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Oxygen Role: A major component of all organic molecules. Major abiotic source: The atmosphere (as O2). Major biotic processes: Used in cellular respiration. Released in photosynthesis.
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Nitrogen Role: A major component of proteins and nucleic acids Major abiotic source: The atmosphere (as N2). Major biotic processes: Incorporated in to food chains by nitrogen-fixing bacteria. Released through decomposition (“denitrification”)
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Phosphorous/Sulfur Role: A major component of proteins (sulfur) and nucleic acids (phosphorous). Phosphate groups are also used in energy storage and release. Major abiotic source: The lithosphere (in rocks). Released in weathering processes. Major biotic processes: Incorporated in to food chains from soil. Released by decomposition.
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Hydrogen Role: A major component of all biological molecules. Does not exist freely in nature. Major abiotic source: The hydrosphere (in H2O). Major biotic processes: Incorporated in to food chains along with water. Released through decomposition/water release.
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2. PROPERTIES OF WATER
2.1: Organisms must exchange matter with the environment to grow, reproduce and maintain organization.
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Organisms are mostly water Water has major properties that allow for life processes. Most of water’s properties are due to its polarity and hydrogen bonding (H-Bonds).
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Adhesional/Cohesional forces
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Solubility
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Condensation/Hydrolysis Reactions
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Transpirational Pull
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Water is a Temperature Buffer
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3. MATH SKILLS- PH
2.1: Organisms must exchange matter with the environment to grow, reproduce and maintain organization.
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Water Dissociates A water molecule can be pulled apart into a proton (H+/H3O+) and a Hydroxide ion (OH-) by other water molecules. This happens ~ once for every 10,000,000 (107) water molecules.
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In pure water, the concentrations of H+ and OH- are each 10-7 (one in 10 million). Acids: substances that increase the amount of H+ ions in an aqueous solution. This will cause the concentration of OH-
ions to decrease. Bases: Substances that decrease the amount of H+ ions in an aqueous solution. This will cause the concentration of H+ ions to increase.
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pH a measurement of the concentration of H+ ions in a solution.
pH = - log [H+] The negated exponent of the pH concentration (make it positive) is the pH. Acids have a pH lower than 7. Bases have a pH higher than 7.
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pH is a logarithmic scale Each whole number on the pH represents a power of 10. A solution with a pH of 5 has a [H+] that is 100 times more acidic than a solution with a pH of 7.
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1. BIOLOGICAL MOLECULES
2.2: The subcomponents of biological molecules and their sequence determine the properties of that molecule.
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4 Types of Macromolecules Carbohydrates- Sugars: short-term energy storage and structural support. Lipids- Fats, oils, waxes: long-term energy storage, cell membrane structure, and cell signaling. Proteins- function in all cellular processes. Nucleic Acids- DNA and RNA: information storage and expression.
All macromolecules are synthesized via condensation reactions and decomposed via hydrolysis reactions. Most macromolecules are polymers.
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Carbohydrates Monomer: Monosaccharide Polymer: Polysaccharide
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Lipids Steroids, triglycerides, and phospholipids
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Proteins Monomer: Amino Acids (20 kinds) Polymer: Polypeptide
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Nucleic Acids Monomer: Nucleoside Polymer: Nucleic Acid (DNA or RNA)
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1. VARIATION IN BIOLOGICAL MOLECULES- CARBOHYDRATES AND LIPIDS
2.3: Variation in molecular units provides cells with a wider range of functions.
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Structure Determines Function The structure of a molecule enables its function. Ex: Cellulose vs. Amylose
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Ex. lipid composition in cell membranes.
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2. VARIATION IN BIOLOGICAL MOLECULES- PROTEINS
2.3: Variation in molecular units provides cells with a wider range of functions.
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The structure of a molecule enables its function. Proteins are responsible for all cellular processes. They have a wide diversity of structures.
Structure Determines Function
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Amino Acids 20 different types in most biological systems. Same general structure with a variable (‘R’) group.
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Amino Acids are joined via Peptide Bonds
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4 levels of protein structure Because proteins have such complex structures, their organization is considered at 4 levels of resolution. Each level is due to different interactions among amino acids.
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Primary Structure The sequence of amino acids in a polypeptide chain. Interactions: Peptide bonds
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Secondary Structure Regular 3D structures found in most proteins. Interactions: H-Bonds among non-R group atoms.
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Tertiary Structure Specific, unique 3D structure (“conformation”) of a polypeptide chain. Interactions: R-group interactions between each other and the environment
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Quaternary Structure Structure that results from multiple polypeptide chains interacting.
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Ex. Fetal Hemoglobin vs. Adult Hemoglobin
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Ex. Antibody Variation
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Denaturation Changes in the 3D structure of a macromolecule. Caused by changes to the environment of the molecule. Disrupts function.
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3. VARIATION IN BIOLOGICAL MOLECULES- NUCLEIC ACIDS
2.3: Variation in molecular units provides cells with a wider range of functions.
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The structure of a molecule enables its function. Nucleic Acids are responsible for storing and expressing genetic information.
Structure Determines Function
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DNA sequence determines protein sequence.
A change in DNA sequence can affect all levels of organism function.
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DNA ! RNA ! Protein
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Ex. Sickle Cell Anemia
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Increases in Genetic Information Genetic Duplications can lead to increased genetic information. This duplicated information can evolve to allow for novel functions.
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Ex. Antifreeze Gene in Cold-Water Marine Fish
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1. CELL MEMBRANE STRUCTURE
2.4: Cell membranes are selectively permeable due to their structure.
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The cell membrane is a boundary between the cell and the environment. It controls the transport of materials in/out of the cell.
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The Fluid Mosaic Model Connects membrane structure to function. 2 components: phospholipids and proteins
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Phospholipids are amphipathic. They spontaneously form a bi-layer in aqueous environments. The inside of the bi-layer is hydrophobic.
Phospholipids
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Membrane Proteins Membrane proteins serve a variety of functions for the cell.
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Selective Permeability Only small, non-polar molecules move through the bi-layer. All other material must move through protein pores
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Cell Walls Many cells are surrounded by cell walls, which are inactive structural supports.
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Cell Wall Structure All cell walls are fibers of structural polysaccharides.
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Plant-like, fungal, and prokaryotic cells all have cell walls (of different polysaccharides). Animal-like cells do not.
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2. MATH SKILL- CONSTRAINTS ON CELL SIZE
2.4: Cell membranes are selectively permeable due to their structure.
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Living Systems are Constrained by the Environment
The need to efficiently exchange material with the environment limits cell size. Lower limit: due to materials required to be a functional cell. Upper limit: Surface area: Volume ratio- volume increases as a cubic function of size, while surface area increases as a squared function.
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As volume increases, exchange efficiency decreases
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Cells have adapted to maximize surface area when material exchange needs to be maximized. Ex. Lung alveoli, and plant root hairs
Surface Area Adaptations
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5. MATH SKILLS- SURFACE AREA: VOLUME RATIO
2.1: Organisms must exchange matter with the environment to grow, reproduce and maintain organization.
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What you need to do. Be able to calculate the surface area and volume of a 3D cell and determine the relative efficiency of material exchange. The formula sheet has formulas for surface area and volume for a variety of 3D shapes.
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Sample Problem Determine the relative efficiency of material exchange for a spherical cell with a radius of 10 μm, and a cubic cell with a side length of 10 μm.
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1. MECHANISMS OF CELLULAR TRANSPORT
2.5: Growth and dynamic homeostasis are maintained by the constant movement of molecules across membranes.
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Transport is controlled by the cell membrane. Transport can be active or passive.
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Passive Transport Does not require energy, moves with the concentration gradient. Passive Transport is called “Diffusion”
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Simple Diffusion Small, non-polar molecules are able to diffuse across the phospholipid bi-layer. Cells control simple diffusion by controlling the concentrations of these molecules.
Oxygen (O2) Carbon Dioxide (CO2)
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Facilitated Diffusion Molecules that are polar/charged, must diffuse through protein pores in the cell membrane. Pores are specific for specific molecules.
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Ex. Aquaporins Channels that allow water to diffuse (“osmosis”)
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Active Transport Cells move molecules against the concentration gradient by using energy. The energy is used to operate “pump proteins”. Ex. Sodium-Potassium Pump
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Co-Transport Cells can transport multiple molecules simultaneously using co-transporters.
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Bulk Transport Cells transport bulk molecules by surrounding them with membrane (“vesicles”)
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Vesicular transport can be internal (“endocytosis”) or external (“exocytosis”) Shown: Release of molecules from cell A to cell B.
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2. ANALYZING TRANSPORT
2.5: Growth and dynamic homeostasis are maintained by the constant movement of molecules across membranes.
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Tonicity A measurement of the relative concentrations of solute between two solutions (inside and outside of cell). Hypertonic: More solute/less solvent. Hypotonic: Less solute/more solvent Isotonic: Equal concentrations. These terms are comparative. The solvent is always water.
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Tonicity effects cell physiology. Solute moves from hypertonic to hypotonic solutions IF it is able to. Solvent (water) moves from hypotonic to hypertonic solutions.
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Different cell types are adapted to different tonicity relationships.
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3. MATH SKILLS- WATER POTENTIAL AND SOLUTE POTENTIAL
2.5: Growth and dynamic homeostasis are maintained by the constant movement of molecules across membranes.
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What You Have To Do Be able to calculate water potential and use it to determine how likely it is that water will move in to or out of a cell. Water Potential (Ψ): A measurement of how likely it is that water will move in/out of a solution. Pure water is assigned a potential of 0. The more negative the potential, the more likely water will move in to the area.
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Ψ
Ψp = pressure potential (external force). Ψs = solute potential (tonicity). The units for Ψ are pressure units. Typically bars (aka torr, mmHg) If a system is at amospheric pressure, Ψp is 0
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Solute Potential
• i = ionization constant for the solute (1.0 for sucrose, 2.0 for NaCl, etc.)
• C = molar concentration of the solute • R= pressure constant 0.0831 liter bars/
mole K • T= temperature in Kelvin (C + 273)
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Sample Problem Determine which of the following solutions will gain the most water if placed in to a sample of pure water in a piece of dialysis tubing at the temperature indicated: Solution: Solute: Tonicity: Temperature
A Sucrose 2M 298K
B NaCl 1M 290K
C Glucose 1M 300K
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1. CELLULAR COMPARTMENTALIZATION
2.6: Eukaryotic cells maintain internal membranes that partition the cell into specialized regions.
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Cells are Compartmentalized Compartmentalization allows for increased control and efficiency of cellular processes. Different areas of the cell can be specialized for different metabolic tasks.
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Prokaryotes and Eukaryotes
The major dividing line in cellular organization. Prokaryotes: No internal compartments. Eukaryotes: Many internal compartments (“organelles”)
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Prokaryotes AKA “Bacteria”. The vast majority of life on Earth. Always unicellular, contain less DNA, and generally smaller than Eukaryotes.
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Eukaryotes Protists, Plants, Fungi, and Animals. Unicellular and multicellular. Generally larger cells than prokaryotes.
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“Plant-Like” Eukaryotes Adapted for autotrophic nutrition. Plants and photosynthetic protists.
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Adapted for heterotrophic nutrition. Animals, Fungi, and heterotrophic Protists.
“Animal-Like” Eukaryotes
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2. MAJOR EUKARYOTIC ORGANELLES
2.6: Eukaryotic cells maintain internal membranes that partition the cell into specialized regions.
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Organelles Increase Efficiency
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Porous membrane that separates the cell’s DNA genome from the rest of the cellular environment.
The Nuclear Membrane
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The nuclear membrane is structured to allow its function in storing cellular information and allowing information to flow from the nucleus to ribosomes in the cytoplasm.
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Membranous channels that run throughout the cell. Produce membrane and transport proteins. Rough ER: covered in “bound” ribosomes. Smooth ER: not covered in ribosomes
Endoplasmic Reticulum
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The ER (#3, #4) is part of the cell’s “endomembrane system”, which is involved in production and transport of membrane and membrane proteins.
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A series of flattened membranous compartments that receive material from the ER, and modify it before targeting it for delivery to other areas of the cell.
Golgi Apparatus
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The Golgi Apparatus (#9 - #11) is also a major part of the endomembrane system, receiving material from the endoplasmic reticulum before sending it elsewhere in the cell.
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The site of Aerobic Cellular Respiration. Double membrane. Highly folded inner membrane (a surface area adaptation)
Mitochondria
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Mitochondria are adapted for their role in cellular metabolism and also posses structural remnants of their endosymbiotic origin
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The site of Photosynthesis. Double membrane. Inner membrane is stacked (a surface area adaptation)
Chloroplasts
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Chloroplasts are adapted for their role in cellular metabolism and also posses structural remnants of their endosymbiotic origin
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1. ORGANELLE STRUCTURE AND FUNCTION- INFORMATION PROCESSING
2.7: The structure and function of subcellular components, and their interactions, provide essential cellular processes.
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Cellular Information Flow
A change in DNA sequence can affect all levels of organism function.
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Ribosomes Universal in all cells. Two subunits made of RNA and protein. Exist “free” in cytoplasm, and “bound” to the ER in eukaryotes.
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Ribosomes convert nucleic acid information into polypeptide chains
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The Endomembrane System The flow of information from the nucleus to proteins. Nucleus ! ER ! Golgi ! Final Destination
Note: Cytoplasmic proteins are made by “free” ribosomes and may not move into the ER/ endomembrane system.
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2. ORGANELLE STRUCTURE AND FUNCTION- MATTER AND ENERGY PROCESSING
2.7: The structure and function of subcellular components, and their interactions, provide essential cellular processes.
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Mitochondrial Anatomy A double membrane which allows for separation of different processes. The inner membrane (the “cristae”) contains many copies of the enzymes needed to produce ATP, with maximized surface area.
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Chloroplast Anatomy A double outer membrane with inner membranous stacks called “thylakoids” The thylakoid membrane contains many copies of the enzymes and chlorophyll needed to produce chemical energy from solar radiation. The stroma contains the enzymes needed to produce organic compounds
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Mitochondria and chloroplasts contain their own circular DNA, and their own ribosomes.
mitochondrial DNA
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Lysosomes Membrane-enclosed sacs that contain collections of digestive, hydrolytic enzymes. Have roles in digestion of molecules, recycling a cell’s damaged components, and programmed cell death.
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Vacuoles A membrane-bound sac that stores material. Plants have a large central vacuole that increases the cells surface area: volume ratio by decreasing the active volume
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Image Credits All images taken from wikimedia commons.