Which of the following is not true of an en-
zyme? An enzyme
a. is a protein.
b. acts as a biological catalyst.
c. supplies energy to start a chemical reaction.
d. is specific.
e. lowers the energy barrier for a chemical
reaction.

How do water’s relative densities as a solid and a liquid differ from that of most other substances? water’s solid and liquid forms have different densities, while most other substances have solid and liquid forms with similar densities. water’s solid and liquid forms have similar densities, while most other substances have solid and liquid forms with different densities. water’s liquid form is less dense than its solid form, while the opposite is true of most other substances. water’s solid form is less dense than its liquid form, while the opposite is true of most other substances.