Lecture 3 Learning Outcomes - BIOL2085 Cell Biology - Professor Maria Torres
Which of the following is NOT correct about amino acids? -they can form ionic bonds -they are composed of a central carbon surrounded by an amino group, a carboxyl group, a hydrogen atom and a variable side chain -they can form peptide bonds -they can have side chains that are polar, nonpolar, or with unique properties -they are joined together in a protein by glycosidic bonds
-they are joined together in a protein by glycosidic bonds
Saturated fats tend to be solid at room temperature because they can form more intermolecular bonds called -covalent bonds -hydrogen bonds -van der Waals forces -electrostatic attractions
-van der Waals forces
Considering that the pKa of an amino group of an amino acid if about 8 and of the carboxyl is 3, what would be the charge on this amino acid at pH 4? 0 -2 +1 -1
0
At neutral pH, the carboxyl group of an amino acid will probably be found as: -COOH -COOH- -COO- -COH
COO-
saturated fats have higher melting points because: -intermolecular interactions are weaker than between unsaturated fats -their functional groups have different polarity than unsaturated fats -they remain liquid at room temperature -their shape allows them to pack closer together
their shape allows them to pack closer together
Highly saturated fatty acids tend to be solid at room temperature: -true -false
true
Hydrogenation of fatty acids is a process by which: -double bonds are decreased to decrease the melting temperature -double bonds are increased to increase the melting temperature -double bonds are decreased to increase the melting temperature -double bonds are increased to decrease the melting temperature
-double bonds are decreased to increase the melting temperature