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28 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Which of the following properties or processes do we associate with living things? |
ALL OF THE ABOVE |
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Which of the following is the main source of energy for producers such as plants and other photosynthetic organisms? |
Sunlight or solar energy |
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The lowest level of biological organization that can perform all the activities required for life is the... |
Cell |
Skin cell |
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What are the basic "building blocks" if deoxyribonucleic acid? |
20 different kinds of amino acids |
DNA |
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Which of the following statements concerning prokaryotic and eukaryotic cells is not correct? |
Prokaryotic cells contain organelles |
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Once labor begins in childbirth contractions increase in intensity and frequency until delivery. Increasing labor contractions of childbirth are an example of... |
Positive feedback |
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What are the two classifications of prokaryotes? |
Bacteria and archaea |
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About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? |
Carbon hydrogen oxygen nitrogen |
CHON |
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Each element is unique and different from other elements because of the number of protons in the nuclei of its atoms. Which of the following indicates the number of protons in an atom's nucleus? |
Atomic number |
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Calcium has an atomic number of 20 and an atomic mass of 40. Therefore, a calcium atom must have... |
20 protons |
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Two isotopes of the same element will have different numbers of... |
Neutrons |
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From its atomic number of 15, it is possible to predict that the phosphorus atom has... |
B & C only |
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What does the reactivity of an atom depend on? |
Presence of unpaired electron |
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How many neutrons are present in the nucleus of a phosphorus atom? |
16 |
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What is the maximum number of electrons in the 1s orbital of an atom? |
2 |
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What results from an unequal sharing of electrons between atoms? |
A polar covalent bond |
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A covalent bond is likely to be polar when... |
One of the atoms sharing electrons is much more |
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In a single molecule of water, the two hydrogen atoms are bonded to a single oxygen atom by... |
Polar covalent bonds |
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An example of a hydrogen bond is the bond between... |
The H of one water molecule and the O of another |
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What determines the cohesiveness of water molecules? |
Hydrogen bond |
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Which of the following is possible due to the high surface tension of water? |
A water strider can walk on water |
Bug |
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Desert rabbits are adapted to the warm climate because their large ears aid in the removal of heat due to... |
High heat of vaporization of water |
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At what temperature is water at its densest? |
4° C |
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Hydrophobic substances such as vegetable oil are... |
Nonpolar substances |
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Which of the following solutions has the greatest concentration of hydrogen ions? |
Gastric juice at pH 2 |
H+ |
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If the pH of a solution is increased from pH 5 to pH 7, it means that the... |
OH- is 100 times greater than what it was at pH 5 |
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Buffers are substances that help resist shifts in pH by... |
Both B and D |
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Which property if the carbon arom gives it compatibility with a greater number of different elements than any other type of atom? |
Carbon has a valence of 4 |
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