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1. Which of the following contains nitrogen in addition to carbon, oxygen, and hydrogen?
a polysaccharide such as starch
an amino acid such as glycine
a monosaccharide such as glucose
a lipid such as wax
2. Saturated Fatty Acids..
have only single bonds between carbon atoms & fatty acids
have double bonds between carbon atoms of the fatty acids
are usually liquid at room temperature
are found in corn oil
3. Which of the following is (are) true for the class of large macromolecules known as lipids?
all answers are correct
they are insoluble in water
they are an important part of cell membranes
they contain twice as much energy as polysaccharides
Lactose, a sugar in milk, is composed of one glucose molecule joined by a bond to one galactose molecule. How is lactose classified?
Monosaccharide
Pentosaccharide
Disaccharide
Polysaccharide
which best summarizes dehydration reactions & hydrolysis reactions?
dehydration reactions can occur only after hydrolysis
dehydration reactions assemble polymers, & hydrolysis breaks
hydrolysis assembles & breaks polymers
hydrolysis creates monomers & dehydration breaks polymers
Which of the following is not one of the four major groups of macromolecules found in living organisms?
proteins
carbohydrates
glucose
lipids
Which 2 functional groups are always found in amino acids?
carboxyl & amino
glycerol & fatty acids
phosphates & nitrogen bases
hydroxyl & aldehyde
Identify the following...
Polysaccharide
Polypeptide
lipid
monosaccharide
Identify the following
polypeptide
monosaccharide
nucleic acid
lipid
Identify the following
nucleic acid
Saturated fat
protein
unsaturated fat
Ice is lighter & floats in water because it is a crystalline lattice structure in which each water molecule is bonded to other water molecules by what kind of bond?
Ionic
peptide
Covalent
Hydrogen
Water's high specidifc heat is mainly a consequence of the
small size of water molecules
fact that water is a poor conductor of heat
release of heat when hydrogen bonds break & form
inability of water to release heat into dry air
Which of the following is possible due to the high surface tension of water?
Lakes don't freeze solid in water, despite low temperatures
The pH of water remains exactly neutral
A water strider can walk across the surface of a small pond
Organisms resist temperature changes
What do cohesion, surface tension, & adhesion have in common?
All increase when temperature increases
All are properties related to hydrogen bonding
All have to do with nonpolar covalent bonds
All are produced by ionic bonding
Cohesion is a special property of water. Which of the following allow water molecules to be cohesive?
Ionic bonds
Hydrophobic interactions
Nonpolar covalent bonds
Hydrogen bonds
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
