Question

Water is polar because

Select one:

a. the water molecule is uncharged, and therefore cannot be polar.

b. the unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.

c. the unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.

d. the molecule is colder at one region of the molecule than other regions of the molecule.

The ability of fish to remain alive and swim underneath a pack of ice demonstrates which of the following properties of water?

Select one:

a. Liquid water is more dense than solid water

b. Water is a good solvent

c. Water has a poor heat capacity

d. Water has a high heat capacity

Carbon is considered the backbone of life. Which of the following attributes of carbon would LEAST contribute to this status?
The ability of carbon to form:

Select one:

a. Part of isomeric compounds.

b. Four covalent bonds with a single atom.

c. Part of long chained molecules.

d. Carbon-carbon double bonds.

Primary structure in polypeptides is generated by

Select one:

a. hydrogen bonds between atoms of the polypeptide backbone.

b. covalent bonds between the side-chains of amino acids.

c. various weak bonds between the side-chains of amino acids.

d. peptide bonds between adjacent amino acids.

Answer 1