Dat biology actual exam - Study guides, Class notes & Summaries
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Cyclic AMP - A secondary messenger important in many biological processes. It is a derivative of 
ATP and is used for intracellular signal transduction in many organisms. 
Which is a secondary messenger? - Cyclic AMP 
Plasmid - Small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal 
DNA. Naturally exist in bacterial cells, but occur in some eukaryotes. Carry genes (act as vehicle) that 
provide bacteria with genetic advantages, such as antibiotic resistance.
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Describe Cell Theory - a.All living things are composed of cells 
b.Cells can only develop from pre-existing cells 
c.Cells are the smallest unit of life 
d.Cells carry their genetic information in the form of DNA 
(T/F) Electron microscopy can be used for the study of live specimens. - False 
. What type of laboratory method can be used to spate cells without destroying them? - 
Filtration, Centrifuge
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Transformation - Integration of a foreign chromosome fragment (plasmid) into the host genome 
Gametic Isolation - When two closely related species share the same habitat, but the sperm of 
one species cannot fertilize the egg of the other species, and vice versa. 
Pancreas Enzymes - Carboxypeptidase, chymotrypsin, lipase, and trypsin 
Mineralcorticoids - Promote the retention of water, sometimes through the retention of 
minerals. i.e Aldosterone, which promotes the retention of sodium
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Action potential - If threshold level of Na+ is reached/exceeded it will result in the opening of 
the voltage gated Na+ channels down the entire length of the neuron. All or nothing event. 
As stimulus intensity increases, the amplitude and speed of the action potential...? - 
Remain constant 
How is amplitude of an action potential affected by frequency? - It is not affected. 
Action potentials increase as intensity of stimulus increases? - TRUE. As stimulus 
intensity increases, the # of acti...
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