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Chapters Bacteria, viruses, prions
Chapters Bacteria, viruses, prions

... Made of NUCLEIC ACID surrounded by PROTEIN COAT Tiny: smaller than ribosomes Can be double/single stranded Can have DNA/RNA Protein shell = CAPSID Some have ENVELOPES around capsid that aid in host infection BACTERIOPHAGES-viruses that infect bacteria Have no cellular machinery of their own Can only ...
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... DNA Structure: Draw a nucleotide of DNA and identify the three parts. Identify the 4 nitrogen bases in DNA The strands of DNA molecules are held together by hydrogen bonds. Does a molecule of RNA have hydrogen bonds? Explain why or why not. Use the base pairing rules, be able to correctly match the ...
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DNA repair



DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome. In human cells, both normal metabolic activities and environmental factors such as UV light and radiation can cause DNA damage, resulting in as many as 1 million individual molecular lesions per cell per day. Many of these lesions cause structural damage to the DNA molecule and can alter or eliminate the cell's ability to transcribe the gene that the affected DNA encodes. Other lesions induce potentially harmful mutations in the cell's genome, which affect the survival of its daughter cells after it undergoes mitosis. As a consequence, the DNA repair process is constantly active as it responds to damage in the DNA structure. When normal repair processes fail, and when cellular apoptosis does not occur, irreparable DNA damage may occur, including double-strand breaks and DNA crosslinkages (interstrand crosslinks or ICLs).The rate of DNA repair is dependent on many factors, including the cell type, the age of the cell, and the extracellular environment. A cell that has accumulated a large amount of DNA damage, or one that no longer effectively repairs damage incurred to its DNA, can enter one of three possible states: an irreversible state of dormancy, known as senescence cell suicide, also known as apoptosis or programmed cell death unregulated cell division, which can lead to the formation of a tumor that is cancerousThe DNA repair ability of a cell is vital to the integrity of its genome and thus to the normal functionality of that organism. Many genes that were initially shown to influence life span have turned out to be involved in DNA damage repair and protection.
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