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1.Sugar-containing lipids are known as _____.


phospholipids

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glycolipids


sphingolipids


glycerophospholipids


prenol lipids



2.Cerebrosides are different from sphingomyelins in that they have a(n) _____, which sphingomyelins do not have.



choline phosphate group


fatty acid


sugar unit


sphingosine


amino acid


3.A(n) _____ is a dispersion of two liquids that do not normally mix.



emulsion


solution


suspension


aerosol


colloid




4.In a eukaryotic cell, everything between the cell membrane and the nuclear membrane is known as the _____.



mitochondria


nucleus


endoplasmic reticulum


cytoplasm


chloroplast




5.The sequence of amino acids in a polypeptide chain or protein is indicated by the _____.


primary structure


secondary structure


tertiary structure


quaternary structure


quinary structure


6.According to the lock-and-key model of enzyme action, enzymes can undergo a change in conformation when they bind substrate molecules.


True

False




7.Ionic bonds forms between a highly electronegative oxygen atom or a nitrogen atom and a hydrogen atom attached to another oxygen atom or a nitrogen atom, such as those found in polar amino acid side chains.


True

False



8.The rate of enzyme-catalyzed reactions is the greatest at temperatures of 0°C and 100°C.


True

False



9.The proper functioning of a protein is independent of the sequence of amino acids that constitute the protein.


True

False



10.What type of attractive interactions results from electrostatic attractions between positively- and negatively-charged side chains of amino acids?



Ionic bonding


Hydrogen bonding


Disulfide linkages


Dispersion forces


Hydrophobic interactions




11.The location on an enzyme where a substrate binds and is transformed to product is known as the _____.



active site


enzyme cofactor


prosthetic group


enzyme assay


exosite

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