Molecules that are found in living cells and contain the element ___________ are considered organic molecules.
hydrogen
carbon
oxygen
nitrogen
calcium
The versatility of carbon to serve as the backbone for a variety of different molecules is due to
the ability of carbon atoms to form four covalent bonds
the fact that carbon usually forms ionic bonds with many different atoms
the abundance of carbon in the environment
the ability of carbon to form covalent bonds with many different types of atoms
both a and d
Which of the following type(s) of bonds are nonpolar?
C--C
C--O
C--H
both a and b
both a and c
Which of the following molecules are isomers of each other?
a and b
a and c
b and c
a, b, and c
None of them are isomers of each other
A polysaccharide that is commonly found in animals cells and stores energy is
glucose
sucrose
glycogen
starch
cellulose
In contrast to other fatty acids, essential fatty acids
are always saturated fats.
cannot be synthesized by the organism and are necessary for survival.
can act as building blocks for large, more complex macromolecules.
are the simplest form of lipids found in plant cells.
are structural components of plasma membranes
The structures of three molecules are shown below. Which of them is (are) amphipathic?
a only
b only
c only
The monomers of proteins are ___________, and these are linked by polar covalent bonds commonly referred to as ______________.
nucleotides, peptide bonds
amino acids, ester bonds
hydroxyl groups, ester bonds
amino acids, peptide bonds
monosaccharides, glycosidic linkages
A _______________ is a portion of protein with a particular structure and function.
peptide bond
domain
phospholipid
wax
monosaccharide
A DNA molecule contains 30% G. What percentage of its bases are A?
30%
20%
15%
10%
none of the above
