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5
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1. Which of the following contains nitrogen in addition to carbon, oxygen, and hydrogen?
a lipid such as wax
an amino acid such as glycine
a monosaccharide such as glucose
a polysaccharide such as starch
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15
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What property of water is responsible for water transport in plants?
Neutral pH
Capillary action
Acidic water
Surface Tension
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eraser
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gift
Win 10 points!
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shark
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baam
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15
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Can an enzyme in the stomach which a pH of 2 work the same in the intestine which a pH of 7?
No, it would explode
Yes, it will work correclty
Yes, it will form new bonds
No, it would denature
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seesaw
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rocket
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gift
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baam
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15
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Which of the following is an example of hydrophobic material?
paper
Oils
Sugar
table salt
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lifesaver
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gift
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fairy
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baam
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15
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Which of the following is possible due to the high surface tension of water?
A water strider can walk across the surface of a small pond
The pH of water remains exactly neutral
Organisms resist temperature changes
Lakes don't freeze solid in water, despite low temperatures
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15
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In a single molecule of water, the two hydrogen atoms are bonded to a single oxygen atom by
nonpolar covalent bonds
hydrogen bonds
ionic bonds
polar covalent bonds
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15
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Which 2 functional groups are always found in amino acids?
carboxyl & amino
glycerol & fatty acids
hydroxyl & aldehyde
phosphates & nitrogen bases
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15
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Hydrophobic substances such as vegetable oil are...
nonpolar that attract water
nonpolar that repel water
Polar that like water
Charge molecules that like water
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baam
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gift
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rocket
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lifesaver
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15
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An enzyme is primarily made of
carbohydrates
nucleic acids
proteins
lipids
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15
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What do cohesion, surface tension, & adhesion have in common?
All are properties related to hydrogen bonding
All have to do with nonpolar covalent bonds
All are produced by ionic bonding
All increase when temperature increases
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15
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Identify the following...
lipid
Polypeptide
monosaccharide
Polysaccharide
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15
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3. Which of the following is (are) true for the class of large macromolecules known as lipids?
they are an important part of cell membranes
they are insoluble in water
all answers are correct
they contain twice as much energy as polysaccharides
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