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which of the following statements is true about catalysts
catalysts lower the activation energy of a chemical reaction
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the major atom involved in the formation of organic molecules is
carbon
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the major function of this type of organic macromolecules is to store energy
lipids
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which of the following makes up a molecule of water (H2O)
two atoms of hydrogen and one atom of oxygen
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which of the following does not affect the function of enzymes
rate of being used by chemical reactions
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which of the following is not a function of proteins
store and transmit genetic information
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the energy needed to get a chemical reaction started is the
activation energy
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which of the following is not a monomer
protein
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water molecules are polar, with the
oxygen side being slightly negative and the hydrogen side being slightly positive
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enzymes attach and bring together certain specific substances (reactants) at particular regions on the enzymes called
active sites
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a type of bond that occurs due to the unequal sharing of electrons around atoms and which make certain regions of large organic macromolecules slightly positive or negative and create intermolecular attraction between certain regions of that macromolecule is called
van der waals forces
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what sub-atomic particles are found in the orbit/cloud/shells that surround the nucleus of an atom
electrons
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a protein that speeds up the rate of a chemical reaction is called
an enzyme
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a macromolecule has the following atoms present: carbon, hydrogen and oxygen...what kind of macromolecule is it
carbohydrate
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which of the following statements about enzymes is not true
all catalysts are enzymes
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matter is defined as
anything that has mass and takes up space
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the monomers of lipids are
fatty acids
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a substance with a pH that is greater than 7.01 is called
a base
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which of the following is a substance formed by the chemical joining of two or more elements in definite amounts
compound
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the two general types of biochemical reactions are
energy absorbing (endothermic) and energy releasing (exothermic)
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the major functions of this type of organic macromolecule is to store and transfer genetic material:
DNA
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a solution that has a pH of 3 is how many more times acidic than a solution that has a pH of5
2
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identify the reactants in the chemical reaction
--> Y + Z --> YZ
Y and Z
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the major function of this type of organic macromolecule is to provide immediate energy to cells
carbohydrates
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a macromolecule has the following atoms present: carbon, hydrogen, oxygen and nitrogen...what kind of macromolecule is it
protein
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isotopes are atoms of the same element with the same number of
protons/neutrons
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a unique property of water is that due to their polarity water molecules are attracted to other water molecules, this unique property is called
cohesion
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if an atom has an atomic number of 6 and an atomic weight/mass of 14 and has a negative charge, how many protons, neutrons and electrons does it have, respectively
6, 8 ,and 7
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when hydrogen and oxygen combine to form water, water is
a product
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a covalent bond is formed as the result of
sharing electrons
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if an atom contains 3 protons, 4 neutrons, and 3 electrons, its atomic mass (weight) is
7
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the ability of water to absorb a large quantity of thermal energy is a unique property of water called
heat capacity
-
the smallest fundemental unit of matter is
an atom
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if an atom contains 11 protons and 12 neutrons, its atomic number is
11
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a map of eastern north america, showing the pH of rainfall in the various states, indicates that the pH of rain in New York varies from 4.22 to 4.40. according to these figures, the most acidic rainfall in New York Stare has a pH of
4.22
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a solution that has a pH that is less than 7.00 is called
an acid
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in a water molecule shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the hydrogen atoms is
slightly positive
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the monomers involved in the structure of nucleic acids are called
nucleotides
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a macromolecule has the following atoms present: carbon, hydrogen, oxygen, nitrogen and phosphorus...what kind of macromolecule is it
nucleic acid
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pH specifically measures for this particular ion
H+
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an ionic bond is formed as the result of
transferring electrons
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RNA and DNA are types of these kinds of macromolecules
nucleic acids
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when salt is dissolved in water, water is the
solvent
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ions are
any charged atom
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