Term
All living things share four processes: |
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Definition
Growth: an increase in size
Reproduction: an increase in number
Responsiveness: an ability to react to environmental stimul Metabolism: controlled chemical reactions
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Term
Who was Schwann & Schleiden? |
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Definition
Scientists that believed that all living things are composed of cells |
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Term
What are the two types of living cells and their differences? |
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Definition
Eukaryotic
Have membrane surrounding their DNA.
Have internal membrane-bound organelles
Are larger, 10 nm in diameter
Have more complex structure
Composed of algae, protozoa, fungi, animals, & plants
Prokaryotic
Do not have membrane surrounding their DNA
Lacks a nucleus
Lacks various internal structures bound with phospholipid
Are small (less than 10 nm in diameter
have a simple structure
found in bacteria & archaea
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Term
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Definition
are gelatinous, sticky substances that surround the outsides a Prokaryotic cells.They are composed of polysaccharides, polypeptides, or both. |
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Term
What are the two main types of glycocalyces: |
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Definition
1. Capsule
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composed of organized repeating units of organic chem
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Firmly attached to cell surface
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protects cells from drying out
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may prevent bacteria from being recognized and destroyed by its host
2. Slim Layer
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Loosely attached to cell surface
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water soluble
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protects cells from drying out
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sticky layer allows prokayotes to attach to surfaces
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Term
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Definition
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Are responsible for movement
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have long structures that extend beyond cell surface
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are not present on all prokaryotes
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Term
What are the 3 types of Flagella? |
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Definition
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Peritrichous- flagella covering the entire cell
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Single Polar-flagella found at the ends of a cell
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Tuft of polar
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Term
What are lophotichous flagella? |
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Definition
Having two or more flagella at one end |
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Term
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Definition
Are special flagella of spirochetes that tightlyy around the cell instead of protruding into envirnonment.
Also, form an axial filament that wraps around the cell and rotates, enabling it to corkscrew through its medium. |
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Term
Name two diseases caused by spirochetes? |
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Definition
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Term
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Definition
is the ability to respond to a stimuli / environment |
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Term
What is the flagella structure composed of? |
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Definition
Filament, hook, and basal body |
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Term
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Definition
flagella move cell toward or away from stimuli such as chemicals |
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Term
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Definition
flagella move cell toward or away from stimuli such as light |
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Term
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Definition
are short, sticky, proteinaceous, nonmotile extensions of some bacteria that help cells adhere to one another and to substances in the environment. They serve as an important function in biofilms. |
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Term
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Definition
slimy masses of bacteria adhering to a surface |
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Term
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Definition
are hollow, nonmotile tubes of a protein called that connect prokaryotic cells |
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Term
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Definition
joining of two bacterial cells and mediate the movement of DNA from one cell to another |
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Term
What is the bacterial cell composed of? |
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Definition
Peptidoglycan, a complex polysaccharide composed of two alternating sugars called N-acetylglucosamine (NAG) &
N-acetylmuramic acid (NAM)
NAG & NAM are attached to other chains by a crossbridges of amino acids (tetrapeptides) |
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Term
What is the difference between Gram+ & Gram-? |
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Definition
Gram+ cells have a thicker layer of peptidoglycan that also contain teichoic acids. Their thick walls retains the crystal violet dye used in Gram staining.
Gram- cells have only a thin layer of peptidoglycan, outside of which a membrane containing lipopolysaccharide (LPS). |
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Term
What is the function of the cytoplasmic membrane? |
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Definition
separates the contents of the cell from the outside environment, but also controls the contents of the cell, allowing some substances to cross, while preventing the crossing of others. |
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Term
What are the 3 important things to remember about Cytoplasmic Membranes? |
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Definition
1. Referred to as phospholipid bilayer; composed of lipids (hydrophobic tails & hydrophillic phosphate head) and associated proteins.
2. Approxiamtely 1/2 composed of proteins that act as recognition proteins, enzymes, receptors, carriers, or channels
3. Fluid mosaic model describes current understanding of membrane structure |
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Term
What do Prokaryotic cytoplasmic membranes do? |
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Definition
1. Harvest light engergy in photosynthetic Prokaryotes
2. Energy Storage- maintain concentration and electrical gradient
3. Selectively permeable- proteins allow substances to cross membrane |
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Term
What are major passive and active processes? |
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Definition
Passive Processes
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Simple diffusion
- Facilitated diffusion
- Osmosis
Active Processes
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Term
Simple diffusion & Facilitated diffusion |
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Definition
Simple Diffusion- is the movement of chemicals down their concentration gradient, from an area of higher concentration to an area of lower concentration
Facilitated Diffusion- proteins act as channels or carriers to allow certain molecules to diffuse into or out of the cell along their electrochemical gradient.
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Term
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Definition
is the diffusion of water molecules across a selectively permeable membrane in response to differing concentrations of solutes. |
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Term
Symports, Antiports, & Group translocation |
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Definition
Symport- transport two substances in the same direction
Antiport- moves substances in oppposite direction
Group translocation- occurs only in some bacteria, causes a chemical change to the substances being transported
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Term
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Definition
Cytosol- is the liquid portion of the cytoplasm
inclusion- are reserve deposits of lipids, starch or other chemicals with in the cytosol of bacteria |
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Term
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Definition
Unique structures produced by some bacteria that are defensive strategy against unfavorable conditions |
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Term
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Definition
Plays a role in forming the cell's basic shape |
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Term
What are Arcehael cell walls comprised of? |
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Definition
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Term
What are the basic shapes of Prokaryotic cells? |
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Definition
Cocci- sperical
Baccilli- rod
Spiral-
Spirilla- stiff
Spirochetes- flexible
coccobacillus- intermediate between cocci & bacilli |
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