CHAPTERS 1-3 - -Difference between scanned electron and...

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-Difference between scanned electron and transmission electron microscope images. Cell wall slides -FIGURE 4.12 in slide know transport la bara sho bye3melo Cell wall slides -Figure 4.6 UNDER STAND ALL OF THEM AND THEIR FUNCTION 3 domains -Bacteria – single-celled prokaryote -Archaea – single-celled prokaryote -Eukarya – single-celled or multicellular eukaryote 7 characteristics of all living organisms
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1. Composed of cells 2. Complex and ordered 3. Respond to their environment 4. Can grow, develop, and reproduce 5. Obtain and use energy 6. Maintain internal balance 7. Allow for evolutionary adaptation Atomic number = number of protons Sum of protons and neutrons is the atom’s atomic mass Each proton and neutron has a mass of approximately 1 Dalton Ions are charged particles – unbalanced Cation – more protons than electrons = net positive charge Anion – fewer protons than electrons = net negative charge Atoms of a single element that possess different numbers of neutrons Radioactive isotopes are unstable and emit radiation as the nucleus breaks up Half-life – time it takes for one-half of the atoms in a sample to decay Oxidation = loss of an electron LEO Reduction = gain of an electron GER 90 naturally occurring elements Only 12 elements are found in living organisms in substantial amounts Four elements make up 96.3% of human body weight Carbon, hydrogen, oxygen, nitrogen Organic molecules contain primarily CHON Molecules are groups of atoms held together in a stable association Compounds are molecules containing more than one type of element Nonpolar covalent bonds = equal sharing of electrons Polar covalent bonds = unequal sharing of electrons Within a water molecule, the bonds between oxygen and hydrogen are highly polar
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