In what part of the cell cycle does the dna make a copy of itself?

a. interphase
b. prophase
c. telophase
d. cytokinesis

Which class of organic compounds makes up the channels and pumps that move materials from one side of the cell membrane to the other? a.) carbohydrates b.) lipids c.) proteins d.) nucleic acids

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?