Lectins are a class of: sugar complexes that bind to proteins on the cell surface. lipids that bind to proteins on the cell surface. proteins that bind to sugar complexes on the cell surface. proteins that bind to lipids on the cell surface. None of these are correct.

Which of the following mutations is most likely to cause the aggregation of a protein? the mutation of a surface glu to an asp the mutation of an interior val to an ile the mutation of a surface glu to a val the mutation of a surface thr to a glu the mutation of an interior thr to a ser

In the "fluid  " _______ cell membrane model, lipids are organized in a ________ arrangement, such that _______ portions of the lipids are exposed to either the interior or exterior of the cell, while the  lipid portions are sandwiched in the middle of the membrane.  As part of the cell membrane, a main function of peripheral proteins is to provide  _________ , while a main function of  proteins is to provide _________  .  Other cell membrane molecules include a compound called  __________, which functions to provide fluidity to rigid membranes and rigidity to fluid membranes; and surface carbohydrates, which function in the membrane not to provide energy, but instead to provide _________ _____  .  Aminophospholipids (including PE and  ) move to the inner leaflet of the membrane, by an enzyme known as the  ._______  A main function of the cell membrane is to be very selective as to what is able to cross through, a condition known as a  barrier.

Which of the following statements about proteins is correct?     There are 20 types of amino acids commonly found in proteins.     Proteins are composed of glyosidic bonds.     Proteins are never folded.     They do not contain any hydrophilic or hydrophobic residues.     Peptide bonds are composed of only carbon and oxygen atoms.