3591232
Descrição
Quiz por mcarpent6140, atualizado more than 1 year ago
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Criado por mcarpent6140
quase 9 anos atrás
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Questão 1
Questão
Shown here are the structures of fructose and glucose. These two molecules are
Responda
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geometric isotopes
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enantiomers
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geometric isomers
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structural isomers
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nonisotopic isomers
Questão 2
Questão
Which of the following statements correctly describes geometric isomers?
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They have variations in arrangement around a double bond
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They have an asymmetric carbon that makes them mirror images
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They have the same chemical properties
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They have different molecular formulas
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Their atoms and bonds are arranged in different sequences
Questão 3
Questão
Research indicates the Ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; that is, molecules that
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have identical three-dimensional shapes
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are mirror images of one another
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lack an asymmetric carbon
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differ in the location of their double bonds
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differ in electrical charge
Questão 4
Questão
Research indicates that Albuterol, a drug used to relax bronchial muscles, improving airflow and thus offering relief from asthma, consists only of one enantiomer, the R- form. Why is it important for this drug to consist of only one enantiomer form, rather than a mixture of enantiomers?
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Different enantiomers may have different or opposite physiological effects
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It is impossible to synthesize mixtures of enantiomers
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It is much less expensive to synthesize one enantiomer at a time
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Albuterol is an example of a compound for which only one enantiomer exists
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Only the R-form of Albuterol has been studied; until more information is available, physicians prefer to use the pure R- form.
Questão 5
Questão
Which of the following is TRUE of both starch and cellulose?
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They are both polymers of glucose
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They are geometric isomers of each other.
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They can both be digested by humans
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They are both used for energy storage in plants
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They are both structural components of the cell wall
Questão 6
Questão
Which of the following is true of cellulose?
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It is a polymer composed of sucrose monomers
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It is a storage polysaccharide for energy in plant cells
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It is a storage polysaccharide for energy in animal cells
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It is a major structural component of plant cell walls
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It is a major structural component of animal cell plasma membranes.
Questão 7
Questão
Humans can digest starch but not cellulose because
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the monomer of of starch is glucose, while the monomer of cellulose is galactose
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human has enzymes that can hydrolyze the beta glycosidic linkages of starch but no the alpha glycosidic linkages of cellulose
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Humans have enzymes that can hydrolyzes the alpha glycosidic linkages of starch but not the beta glycosidic linkages of cellulose
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humans harbor starch-digesting bacteria in the digestive tract
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the monomer of starch is glucose, while the monomer of cellulose is maltose
Questão 8
Questão
All of the following statements concerning saturated fats are true except
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They are more common in animals than in plants
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They have multiple double bonds in the carbon chains of their fatty acids
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They generally solidify at room temperature
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They contain more hydrogen than unsaturated fats having the same number of carbon atoms
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They are one of several factors that contribute to atherosclerosis.
Questão 9
Questão
The R group or side chain of the amino acid serine is -CH2 -OH. The R group or side chain of the amino acid alanine is -CH3. Where would you expect to find these amino acids in a globular protein in aqueous solution?
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Serine would be in the interior, and alanine would be on the exterior of the globular protein.
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Alanine would be in the interior, and serine would be on the exterior of the globular protein.
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Both serine and alanine would be on the interior of the globular protein.
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Both serine and alanine would be on the exterior of the globular protein.
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Both serine and alanine would be in the interior and exterior of the globular protein.
Questão 10
Questão
If one strand of a DNA molecule has the sequence of bases 5' ATTGCA3' the other complementary strand would have the sequence
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5'TAACGT3'
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3' TAACGT5'
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5' UAACGU 3'
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3'UAACGU5'
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5'UGCAAU3'
Questão 11
Questão
Why are human sex hormones considered to be lipids?
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They are essential components of cell membranes.
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They are steroids, which are not soluble in water.
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They are made of fatty acids
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They are hydrophilic compounds
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They contribute to atherosclerosis
Questão 12
Questão
If 2 molecules of the general type showing in this figure were linked together carbon 1 of one molecule to carbon 4 of the other, the single molecule that would result would be
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maltose
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fructose
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glucose
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galactose
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sucrose
Questão 13
Questão
What maintains the secondary structure of a protein?
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peptide bonds
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hydrogen bonds
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disulfide bonds
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ionic bonds
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phosphodiester bonds
Questão 14
Questão
Which of the following statements is true regarding the molecule illustrated in this picture?
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It is a saturated fatty acid.
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A diet rich in this molecule may contribute to atherosclerosis
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Molecules of this type are usually liquid at room temperature.
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A and B only
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A, B, and C
Questão 15
Questão
All of the following statements concerning saturated fats are true except
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they are more common in animals than in plants
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they have have multiple double bonds in the carbon
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they generally solidify at room temperature
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they contain moe hydrogen than unsaturated fats having the same number of carbon atoms
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they are one of several factors that contribute the atherosclerosis
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