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| the tree in your backyard is home to two cardinals, a colony of ants, a wasp's nest, two squirrels, and millions of bacteria. together, all the ants make up a(n) |
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| what is the difference between DNA and RNA |
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| DNA contains thymine in place of uracil |
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| an organic compund differs from an inorganic compound in that an organic compund: |
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| occupies space, has mass, is composed of elements, is what life is composed of |
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| which protein structures consists of a chain of amino acids assembled in a specific order |
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| compounds composed of only hydrogen and carbon are called |
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| how many fatty acids are bonded to glycerol molecule to produce a lipid (a triglyceride) |
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| if a compound is water-loving, then it is said to be |
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| oxygen and hydrogen molecules in water are held together by |
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| an atom has 6 protons and 8 neutrons. its atomic mass is_atomic mass units |
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| what is not a polysaccharide |
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| fatty acids with all single bonds between their carbons are |
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| may be polar or nonpolar depending on the atoms involved |
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| typically, nitrogen atoms are composed of seven electrons, seven protons, and seven neutrons. an isotope of nitrogen could |
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| have more than seven neutrons |
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| what is NOT a part of a nucleotide |
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| what is NOT a type of atomic bonding |
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| what is an example of secondary structure in a protein |
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| alpha helix and pleated sheet |
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| a phospholipid is composed of |
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| one glycerol molecule linked to one phosphate group and two fatty acid molecules |
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| the substance that is dissolved in solution |
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| polar covalent bond occurs when |
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| atoms share electrons unequally with each other |
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| if neutral atoms become positive ions, they |
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| what represents the pattern of energy flow within an ecosystem |
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| producers--consumers--decomposers |
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| the atomic number of an atom is |
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| the number of protons in the atom |
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| amino acids differ from one another by the |
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| chemical properties of their R groups |
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| a major type of lipid found in cell membranes is |
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| what is NOT a characteristic of all living organisms |
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| the atom oxygen contains 8 electrons, 8 protons, and 8 neutrons. what is the atomic number of oxygen |
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| any chemical interaction between atoms |
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| involves only valence electrons |
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| in which form are carbohydrates stored in animals |
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| isotopes differ from each other with respect to the number of |
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| four most common elements in living organisms are |
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| you now know that the old cliche "oil and water don't mix"is true. why |
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| water exhibits polarity and oil does not |
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| always contain carbon and are synthesized by cells |
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| using the Linnaean system of nomenclature, corn is name Zea mays. in this name the genus is |
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| the storage form of carbohydrates in plants is |
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| can be linked together to form a double helix, contain phosphate groups, contain sugar molecules, contain nitrogenous bases |
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| starch, glycogen, and cellulose are all characterized as |
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| what is NOT a type of nucleic acid |
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| the nucleus of an atom contains |
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| proteins are polymers that contain monomeric subunits called |
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| a solution with a pH of 14 is |
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| which sequence correctly lists the different levels of biological organization from simple to complex |
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| cells>tissues>organs>organ systems>organism |
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| what is the most basic level of chemical organization |
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| elements differ from one another by their number of |
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| the representation H--O--H is known as |
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| when full, the outermost electron shell of an atom contains__electrons, and the innermost shell contains__electrons |
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| an atom is most stable when |
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| the outer electron shell or energy level is full |
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