Adding heat to a liquid can cause it to
a. change into a gas
b. change into a solid
c. change into another substance
d. become a gel

When ash and dust begin to settle on the ground, they eventually become compacted by

Select the correct answer from each drop-down menu. the lac operon in e. coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .

Dna, in the nucleus carries the genetic code for making proteins in ribosomes. in the diagram, b, represents the proteins produced. dna cannot leave the nucleus to carry the genetic information to the ribosome where proteins are produced. how does the genetic code get from the nucleus to the ribosome? what does a represent? now