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| molecule, cell, organ system, population, ecosystem, biosphere |
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Definition
| sequences represents the hierarchy of biological organization from least to most complex level? |
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| The lowest level of biological organization that can perform all the activities required for life is the |
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1 out of 1 points
Which of the following, reflected in the phrase "the whole is greater than the sum of its parts", is a consequence of the organization and interaction among component parts ? |
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Term
| evolution by natural selection. |
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Definition
| Through time, the lineage that led to modern whales shows a change from four-limbed land animals to aquatic animals with two limbs that function as flippers. This change is best explained by |
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1 out of 1 points
Which of the following best describes the synthesis of a protein from amino acids? |
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Definition
| Asexual reproduction is to uniformity as sexual reproduction is to ____________. |
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| Evolutionary change by natural selection |
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Definition
| Variation resulting from sexual reproduction has the greatest implications for which of the following processes associated with life? |
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Definition
| Which of the following types of macromolecules functions in information storage and retrieval in the cell? |
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Definition
| Building large complex molecules from simpler building blocks requires energy ___________. This process is called _____________. |
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Definition
| Which of the following is a term for a localized group of organisms that belong to the same species? |
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Definition
| A maple leaf is at which level in the hierarchy of biological organization? |
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Definition
| Which of the following is a term for a localized group of organisms that belong to the same species? |
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Definition
| DNA is a macromolecule composed of building blocks called |
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| Metabolism is defined as: |
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Definition
| the ability of an organism to respond to a stimulus |
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Definition
| Which of the following types of macromolecules has the greatest variety of functions in the cell? |
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Definition
| Which of the following types of macromolecules functions in energy storage in the cell? |
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| Individuals of the single-celled organism Euglena maintain a particular distance from a light source to optimize photosynthetic efficiency. Caribou herds migrate on a seasonal basis to mate and find food. In some animals, glands produce sweat in response to elevated temperature. These are all examples of : |
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Definition
| DNA is a macromolecule composed of building blocks called |
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| carbon, hydrogen, nitrogen, oxygen |
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Definition
| Which of the following are macorelements that make up approximately 96% of living matter? |
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Definition
| Which of the following is a trace element that is required by humans and other vertebrate animals? |
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1 out of 1 points
Which of the following is unique to each element? |
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1 out of 1 points
The mass number of an element can be easily approximated by adding together the number of _________ in an atom of that element. |
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Term
| electrons in the outer (valence) shell in the atom. |
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Definition
| The reactive properties or chemical behavior of an atom depend on the number of |
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Term
| be stable and chemically nonreactive or inert. |
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Definition
| Atoms of elements having eight electrons in the second energy level tend to |
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Term
| ach hydrogen atom has a partial positive charge |
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Definition
| Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)? |
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Definition
| If two atoms of equal electronegativity interact they are expected to form |
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Definition
| What results from an unequal sharing of electrons between atoms. |
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Definition
| What explains most specifically the attraction of water molecules to one another. |
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Term
B.
concentration of OH- has decreased 10 times what it was at pH 9.
concentration of H+ has increased 10 times what it was at pH 9. |
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Definition
| If the pH of a solution is decreased from 9 to 8, it means that the |
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Term
B.
accepting H+ when they are in excess.
donating H+ to a solution when they have been depleted. |
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Definition
| Buffers are substances that help resist shifts in pH by |
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Definition
| In a single molecule of water, the two hydrogen atoms are bonded to a single oxygen atom by |
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Definition
| The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called? |
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Term
| the bonds that hold together the atoms in a water molecule are polar covalent bonds. |
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Definition
| Water is able to form hydrogen bonds because |
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Term
| absorption and release of heat when hydrogen bonds break and form. |
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Definition
| Water's high specific heat is mainly a consequence of the |
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Term
| nonpolar substances that repel water molecules. |
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Definition
| Hydrophobic substances such as vegetable oil are |
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Definition
| Which of the following ionizes completely in solution and is considered to be a strong acid? |
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Definition
| Which of the following ionizes completely in solution and is considered to be a strong base? |
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Definition
| Which of the following solutions has the greatest concentration of hydrogen ions [H+]? |
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Definition
| Which of the following solutions has the greatest concentration of hydroxide ions [OH-]? |
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Term
| concentration of OH- is 100 times greater than what it was at pH 5. |
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Definition
| If the pH of a solution is increased from pH 5 to pH 7, it means that the |
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Term
| They maintain a relatively constant pH. |
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Definition
| Which of the following statements is true about buffer solutions? |
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Term
| hydrogen ions is equal to the concentration of hydroxide ions. |
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Definition
| In a neutral solution the concentration of |
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Definition
| Contains most of the DNA of the cell; • Controls/integrates the function of other organelles |
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Definition
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Term
| the removal of water (dehydration synthesis). |
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Definition
| Polymers of polysaccharides, nucleic acids, and proteins are all synthesized from monomers by which process? |
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Term
| Dehydration reactions assemble polymers, and hydrolysis breaks down polymers. |
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Definition
| Which of the following best summarizes the relationship between dehydration synthesis and hydrolysis? |
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Definition
| Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage to one galactose molecule. How is lactose classified? |
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Term
| They are both polymers of glucose. |
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Definition
| Which of the following is true of both starch and cellulose? |
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Term
| have a higher ratio of hydrogen to carbon than do unsaturated fatty acids. |
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Definition
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Term
| separate the major organelles so their particular functions can be studied. |
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Definition
| A primary objective of cell fractionation is to |
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