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brandoncu1
on FreezingBlue Flashcards.
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What maintains the secondary structure of a protein?
hydrogen bonds between the amino group of one peptide bond and the carboxyl group of another peptide bond
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Changing a single amino acid in a protein consisting of 325 amino acids would
always alter the primary structure of the protein, sometimes alter the tertiary structure of the protein, and affect its biological activity
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Which of the following statements about the 5' end of a polynucleotide strand of DNA is correct?
The 5' end has a phosphate group attached to the number 5 carbon of ribose.
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Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits. Which of the following is an exception to this statement?
a steroid
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On food packages, to what does the term insoluble fiber refer?
cellulose
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What aspects of protein structure are stabilized or assisted by hydrogen bonds?
secondary, tertiary, and quaternary structures, but not primary structure
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What type of covalent bond between amino acid side chains (R groups) functions in maintaining a polypeptide's specific three-dimensional shape?
disulfide bond
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All of the following contain amino acids except
cholesterol
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Humans can digest starch but not cellulose because
humans have enzymes that can hydrolyze the α glycosidic linkages of starch but not the β glycosidic linkages of cellulose.
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Dehydration reactions are used in forming which of the following compounds?
triacylglycerides, polysaccharides, and proteins
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Which of the following is not a polymer?
glucose
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A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of
120 thymine and 120 adenine molecules.
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The label on a container of margarine lists "hydrogenated vegetable oil" as the major ingredient. What is the result of adding hydrogens to vegetable oil?
The hydrogenated vegetable oil stays solid at room temperature.
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The tertiary structure of a protein is the
unique three-dimensional shape of the fully folded polypeptide.
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What is the term used for a protein molecule that assists in the proper folding of other proteins?
chaperonin
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Which of the following best summarizes the relationship between dehydration reactions and hydrolysis?
Dehydration reactions assemble polymers, and hydrolysis reactions break down polymers.
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Which of the following descriptions best fits the class of molecules known as nucleotides?
a nitrogenous base, a phosphate group, and a pentose sugar
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If one strand of a DNA molecule has the sequence of bases 5'ATTGCA3', the other complementary strand would have the sequence
5'TGCAAT3'
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Upon chemical analysis, a particular polypeptide was found to contain 100 amino acids. How many peptide bonds are present in this protein?
99
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There are 20 different amino acids. What makes one amino acid different from another?
different side chains (R groups) attached to an α carbon
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