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The protein coat of a virus that contains several hundred genes in the form of DNA or RNA.
Contains the nucleic acid. |
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A specific glycoprotein on the host cell membrane that a virus adsorbs to begin infection. |
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The virus commandeers the cell's reproductive amchinery and begins reproducing new viruses.
The cell may fill with viruses until it lyses or bursts, or it can release the virus one at a time through reverse endocytotic processes.
A virus that follows this is a virulent virus. |
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The period from the infection to the lysis. |
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The viral DNA is incorporated into the host genome, or if it is an RNA virus and possesses reverse transcriptase, DNA is actually reverse-transcribed from RNA and then incorporated into the host cell genome.
These are temperate viruses. |
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A virus that maitains its DNA incorporated into the DNA of a host cell. |
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The protein can be directly translated from the RNA.
Include retroviruses that carries reverse transcriptase to create DNA from RNA.
The DNA is incorporated into the genome of the host cell. |
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These viruses are the compliment to mRNA and must be transcribed to plus-RNA before being translated. |
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Do not have membrane bound organelles/nucleus.
Split into Archaea and Bacteria. |
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Prokaryotes that have as much in common with bacteria as they do with eukaryotes. |
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Capable of using CO2 as their sole source of carbon. Create their own food. |
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Use preformed, organic molecules as their source for carbon. |
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Use light as their energy source |
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Use the oxidation of organic or inorganic matter as their energy source. |
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Rigidly shaped helical bacteria |
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Non-rigid helical bateria. |
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Composed of a phosphate group, two fatty acid chains, and a glycerol backbone.
Phosphate is polar, fatty acids are nonpolar. |
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Integral Proteins (Intrinsic Proteins) |
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Definition
Amphipathic proteins that traverse the membrane from the inside of a cell to the outside. |
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Peripheral (Extrinsic) Proteins |
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Situated entired on the surfaces of the membrane. The are ionically bonded to integral proteins or the polar group of a lipid. |
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Chemical Concentration Gradient |
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A gradual change in concentration of a compound over a distance. |
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Factors that affect semipermeability |
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Definition
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The diffusion where molecules move through leakage channels across the membrane due to random motion. |
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Transport/Carrier Proteins |
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Designed to facilitate the diffusion of specific molecules across a membrane. |
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Diffusion that occurs down the electro-chemical gradient of all species involved.
Ex: glucose supply in human cells.
Makes membranes selectively permeable: can select between molecules of similar size and charge. |
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Moving compounds against the electro-chemical gradient.
Requires the expenditure of energy. |
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Bacteria are (hypertonic/hypotonic) to their environment?
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Hypertonic.
There are more particles in their cytosol than in the aqueous solution surrounding them. |
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More particles in the cytosol of the cell than in the aqueous solution surrounding it. |
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Equal particles in the cytosol of the cell compared to the aqueous solution surrounding it.
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Less particles in the cytosol of the cell than in the aqueous solution surrounding it.
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A series of disaccharide polymer chains with amino acids, three of which are not found in proteins.
Makes up the cell wall.
Porous, so it allows large molecules to pass through. |
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Used to prepare bacteria for viewing under a microscope.
Stains gram positive (purple) and negative (pink) differently.
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Thick peptidoglycan wall that prevents stain from leaking out so it appears purple. |
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Have a thing peptidoglycan wall that allows most stain to be washed off and appear pink.
Has a second plasma membrane outside the peptidoglycan wall composed of lipopolysaccharides. |
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Long, hollow, rigid, helical cylinders made from globular protein called flagellin.
Not the same as eukaryotic flagella which are composed of microtubules. |
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Modes of bacteria genetic recombination |
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Transduction, Transformation and Conjugation |
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A form of asexual reproduction that occurs in bacteria.
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Requires one bacteria to have a plasmid with the gene that codes for a sex pilus (conjugative plasmid).
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Small circles of DNA that exist and replicated independantly of the bacterial chromosome. |
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fertility factor.
With the factor is F+
Without is F- |
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The process by which bacteria may incorporate DNA from their external environment into their genome.
DNA aquired directly from the medium. |
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When the capsid of bacteriophage mistakenly encapsulate a DNA frag of a host cell and then these virions infect the new bacterium injecting harmless bacterial DNA frags in stead of virulent viral DNA fragments.
Transfer of DNA via a virus. |
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Can live off dead organic matter |
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Cell wall of a fungi composed of the polysaccharide chitin |
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Eukaryotic heterotrophs that spend most of their livess in the haploid state.
They can reproduce sexually and asexually. |
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