Wo sea urchin proteins were named cyclin a and b because, during the embryonic cell cycle, they were periodically
a. activated and inactivated by phosphorylation and dephosphorylation.
b. synthesized and degraded.
c. ubiquitylated and nonubiquitylated.
d. bound and released by another protein.

Which statements are true of a scientific theory but not a hypothesis

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

What drives an advertising campaign?