BY 123 SI Session 09/09/15
Chapter 3 Water and Life
Water’s having polar covalent bonds leads to what vital force between them?
Hydrogen bonding
What are the 4 properties of water?
Cohesive behavior, moderation of temperature, floats in ice form, solvent of life
What is adhesion and surface tension? Be able to envision a solid example of each and to
explain each example.
Ability of water (due to hydrogen bonds) to attach to atoms OTHER than water such as a
straw or the tree trunk walls;
Does a coffee pot with boiling water have more heat than a very large swimming pool
sitting in 100oF weather?
Swimming pool has more heat, volume
What’s so special about water’s specific heat?
Very high
What’s evaporative cooling? What’s heat of vaporization? Examples?
The amount of heat needed to evaporate 1g of water = 1 cal. If you lose the quickest
molecules on a surface, you reduce temperature (average of energy)
What’s the significance of ice floating? How does it float?
serves as buffer and habitat for organisms; floats bc water expands as it freezes lending to a
lattice structure with many holes leading to its lower density
How much larger is the concentration of hydronium ions in a solution with a pH of 2 vs a
solution with a pH of 9?
a) 7
b) 70
c) 107
d) 710
Chapter 4 Questions
L-dopa and R-dopa are enantiomers of the same molecular formula. L-dopa is the correct
isomer form that treats Parkinson’s disease. What kind of effect does R-dopa have on
Parkinson's disease?
A) It alleviates the symptoms.
B) It makes the symptoms worse or has no effect on Parkinson’s disease.
C) At first it makes the symptoms worse but over the long term it alleviates the symptoms.
D) At first it alleviates the symptoms but over the long term it makes the symptoms worse.
Structural isomers are molecules that
A) are enantiomers.
B) are hydrocarbons.
C) have a ring structure.
D) are mirror images.
E) differ in the covalent arrangements of their atoms.
Which of these functional groups does not contain oxygen?
A) carboxyl
B) sulfhydryl
C) hydroxyl
D) carbonyl
E) phosphate
The gasoline consumed by an automobile is a fossil fuel consisting mostly of
A) aldehydes.
B) amino acids.
C) alcohols.
D) hydrocarbons.
E) thiols.
Which functional group is most likely to be responsible for an organic molecule behaving as
a base?
A) hydroxyl
B) carbonyl
C) carboxyl
D) amino
E) phosphate
Chapter 5
What are the 4 macromolecules?
Carbohydrates, lipids, proteins, nucleic acids
The 4 macromolecules are all known as polymers as well. T/F
Lipids are not polymers because they are not known for being made up of smaller
monomers
Define polymer.
Long molecule consisting of many similar or identical building blocks linked by covalent
bonds
How are monomers connected to each other?
Dehydration or condensation reaction where one monomer provides –OH group and the
other provides a hydrogen.
How are polymers disassembled to monomers?
Hydrolysis reaction where water is added between a bond with h and –oh attaching to the
ends of the monomers.
How many water molecules are needed to hydrolyze a polymer that is 5 monomers long?
4
Sugars, monosaccharides, and polysaccharides are also called carbohydrates. T/F
What is the bond between two conjoined monosaccharides called?
Glycosydic linkage
If sugars are made up of carbon, hydrogen, and oxygen, how are they all soluble in water?
Sugars have many hydroxyl or –OH groups which make them slightly polar and acceptable
to the hydrogen bonds in water
What are the two types of polysaccharides discussed in class?
Storage and structural
What are plants’ storage polysaccharides called? What two forms are there?
Starch; amylase and amylopectin
Animals’ storage polysaccharides?
glycogen
What are plants’ structural polysaccharides called? Why can’t we digest it? Study figures
5.7 and 5.8.
We cannot digest it because we do not have the enzymes to digest beta glucose
Why is cellulose so strong, cable-like, and never branched?
Because of the structure of beta glucose and the tendency of the hydroxyls to flip each and
every glucose molecule, it has the capability of hydrogen bonding to adjacent glucose
molecules on the top and bottom of it to make a very tight-knit, cable-like structure.
T/F No organism can digest or hydrolyze cellulose.
Certain Prokaryotes and protists
What are two uses of chitin, a structural polysaccharide?
Surgical thread
Exoskeleton or found in cell walls of fungi