Frage 1
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The compounds above is a(n)
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Phospholipid
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saturated fatty acid
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unsaturated fatty acid
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triglyceride
Frage 2
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Phosphorus (P) has an atomic number of 15. How many unpaired electrons are in its outer shell?
Frage 3
Frage
Which of the following is a polysaccharide found in plants used for storing energy?
Antworten
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amylose
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amylopectin
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cellulose
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amylose and amylopectin
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all three
Frage 4
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A covalent bond involves:
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a pair of electrons exchanged between atoms
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an electrostatic attraction between atoms
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the sharing of one or more protons between atoms
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the sharing of one or more pairs of electrons between atoms
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the exchange of one or more electrons between atoms
Frage 5
Frage
Unsaturated fatty acids are more likely to
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be liquid at room temperature
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be synthesized by animal cells
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be solid at room temperature
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contain more energy than saturated fatty acids
Frage 6
Frage
Which of the following functional groups tend to allow an organic compound to dissolve in water?
Antworten
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hydroxyl
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methyl
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carbonyl
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hydroxyl and carbonyl
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all three
Frage 7
Frage
The number of protons in the nucleus of an atom is referred to as
Antworten
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atomic mass
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molecular weight
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atomic weight
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atomic number
Frage 8
Frage
Water is a polar molecule because
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it readily forms ionic bonds with many different types of compounds
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its oxygen atom is electronegative, while the hydrogens are electropositive
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its two hydrogen bonds are equally attached to an oxygen
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it has a +2 negative charge
Frage 9
Frage
Methyl groups (CH3-R) are generally
Antworten
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hydrophilic
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amphipathic
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polar
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hydrophobic
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charged
Frage 10
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The breakdown of glycogen into glucose occurs by which of the following
Frage 11
Frage
Which of the following are functions of lipids?
Frage 12
Frage
A solution with a pH of 8 is more ________ than a solution with a pH of 5.
Antworten
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acidic
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concentrated
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hydrophobic
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dense
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basic
Frage 13
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A pH of 4 has a _____-fold greater hydrogen ion concentration than a pH of 6.
Frage 14
Frage
Using the periodic table of elements, which element is most likely to have properties similar to carbon?
Antworten
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aluminum (Al)
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boron (B)
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phosphorus (P)
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silicon (Si)
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nitrogen (N)
Frage 15
Frage
In a polar covalent bond
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anions and cations are attracted to each other
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electrons are transferred between atoms
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when water becomes frozen
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there is an unequal sharing of electrons between atoms
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water molecules attract each other
Frage 16
Frage
The energy of light can be temporarily stored in which component of an atom?
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protons
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photons
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neutrons
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electrons
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introns
Frage 17
Frage
The two nucleic acid strands of DNA are held together by
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glycosidic linkages
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covalent bonding between nitrogenous bases
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hydrogen bonding between sugar-phosphate residues
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hydrogen bonding between nitrogenous bases
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covalent binding between nucelotides
Frage 18
Frage
An acid added to water will
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decrease the hydrogen ion concentration
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decrease the hydroxide ion concentration
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increase the hydroxide concentration
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increase pH
Frage 19
Frage
Which bond contributes to the tertiary structure of a protein?
Antworten
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ionic
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hydrogen
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glycosidic
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ionic and hydrogen
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all three
Frage 20
Frage
Water is pulled up into a tree due to
Antworten
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hydrogen bonding between water molecules
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the cohesive and adhesive properties of water
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the fluidity of water at room temperature
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ionic bonding between water molecules
Frage 21
Frage
Which type of bond maintains the secondary structure of a protein
Antworten
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disulfide bridges
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peptide bonds between two peptide subunits
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hydrogen bonding between two phospholipid subunits
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hydrogen bonding between an amino group of an amino acid and a carboxyl group of another amino acid
Frage 22
Frage
Amino acids within a peptide are covalently linked by peptide bonds between
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acidic and basic side chains
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carbonyl and amino groups
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carboxyl and amino groups
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polar and non-polar side chains
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polar side chains
Frage 23
Frage
Insulin protein is soluble in water. A good explanation for this property is
Antworten
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that it does not have any secondary structure
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it contains disulfide bridges
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many of its amino acids have polar or charged side chains
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most of its amino acids are hydrophobic
Frage 24
Frage
Hydrogen bonds form between
Antworten
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electropositive hydrogen atoms and an electronegative atom
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hydrogen atoms
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hydrogen atoms and any other atom
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hydrogen atoms that share a pair of electrons with another atom
Frage 25
Frage
Of the molecules listed below, which contains the most phosphorus?
Antworten
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carbohydrates
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proteins
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fatty acids
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nucleic acids
Frage 26
Frage
Although cellulose is a polymer of glucose molecules, humans cannot use it as a source of energy. Why?
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cellulose is covered by a waxy coating protecting it from digestion
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cellulose is hydrophobic
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humans don't like the taste of cellulose
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the molecule is too large to be broken down by hydrolytic enzymes
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humans do not express specific enzymes to digest cellulose
Frage 27
Frage
All inert gases, such as neon (atomic number = 10) have which of the following in common?
Antworten
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they have the same number of protons
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they have the same number of valence electrons
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their outer electron shell is completely filled
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they are all highly reactive
Frage 28
Frage
The ionic bond of NaCl arises from
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attraction of a hydrogen atom and an electronegative atom
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transfer of an electron to the nucleus of another atom
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sharing of a pair of electrons
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the attraction between two anions
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an electrostatic attraction between two ions of opposite charge
Frage 29
Frage
The properties of an atom are determined by its
Antworten
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ionic number
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atomic mass
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half-life
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mass number
-
atomic number
Frage 30
Frage
When NaCl dissolves in water
Antworten
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the entire molecule becomes surrounded by water
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each ion becomes surrounded by water
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the covalent bonds between sodium and chlorine atoms are broken
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entire molecule surrounded by water and each ion surrounded by water
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all three
Frage 31
Frage
Which of the functional groups above is a carboxyl?
Frage 32
Frage
Two compounds that are structural isomers
Antworten
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have the same total mass
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have the same shape
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have the same names
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have the same properties
Frage 33
Frage
The tertiary structure of a protein is maintained by
Frage 34
Frage
Why does ice float?
Antworten
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Non-uniform spacing of dissolved ions
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bubbles formed during freezing makes ice more buoyant
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hydrogen bonds forming between water molecules in ice creates crystal lattice structure that keeping the water molecules farther apart
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liquid water is translucent and ice is opaque
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ice contains impurities that keep water molecules away from each other and therefor less dense
Frage 35
Frage
Which of the following molecules is a major component of biological membranes?
Antworten
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carbohydrates
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phospholipids
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fatty acids
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triglycerides
Frage 36
Frage
Phospholipids contain
Frage 37
Frage
If a sample of DNA is composed of 20% guanine, what is the percentage of thymine?
Frage 38
Frage
The side-chain of the amino acid shown above is
Antworten
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non-polar, charged
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non-polar
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polar, uncharged
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polar, charged
Frage 39
Frage
Water acts as a solvent because
Antworten
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it can dissolve any compound
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it can be surrounded by both non-polar molecules and ionic compounds
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it is liquid at room temperature
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it is a polar molecule
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it forms hydrogen bonds with itself
Frage 40
Frage
What kind of reaction is required to synthesize a polymer?
Antworten
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anxiolytic
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hydrophobic
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dehydration
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hydrolytic
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anabolic
Frage 41
Antworten
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is a positively charged atom
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is produced by a covalent bond
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is a negatively charged atom
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contains more neutrons than protons
Frage 42
Frage
A mutation that affects the primary structure of a protein, in turn, may affect
Antworten
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the secondary structure of the protein
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the tertiary structure of a protein
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the quaternary structure of the protein
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secondary and tertiary
-
all three
Frage 43
Frage
Which of the following molecules is a carbohydrate?
Antworten
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C18H9O18
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C10H12O10
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C4H8O4
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C24H2O24
-
C1H3O6
Frage 44
Frage
Which of the following is not true regarding isomers?
Antworten
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isomers have different shapes
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they have the same number of atoms
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they have the same chemical properties
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they may differ in how atoms are arranged across double bonds
-
they have different properties
Frage 45
Frage
Carbon Dioxide (CO2) consists of a carbon atom with double covalent bonds to each oxygen. How many electron pairs are shared between a carbon and oxygen atom?
Frage 46
Frage
Which atoms, when covalently bonded to hydrogen, are generally electronegative?
Antworten
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oxygen
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nitrogen
-
sodium
-
oxygen and nitrogen
-
all three
Frage 47
Frage
An atom with an atomic number of 12 has how many electrons in its most outer shell?
Frage 48
Frage
Glycogen in animals and amylose in plants
Antworten
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are disaccharides
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are polymers that store glucose
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cannot both be digested by humans
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are long chains of amino acids
-
are hydrophobic compounds
Frage 49
Frage
Of the atoms in the first two rows of the periodic table, carbon atoms are unique because they
Antworten
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have four valence electrons
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readily form polar covalent bonds with oxygen atoms
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are molecularly stable
-
four valence electrons and molecularly stable
-
all three
Frage 50
Frage
Which of the following are components of a nucleotide?
Antworten
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polar and non-polar amino acids
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nitrogenous base and phosphate group and sugar
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glycerol and three fatty acids
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glycerol and two fatty acids and phosphate group