Other polar molecules include nucleic acids and some proteins.
look at the dna sketch provided and predict how the two
strands are attracted to one another.

The nucleotides of DNA are bonded to each other through hydrogen bonding. The adenine and thymine form two hydrogen bonds between them. The cytosine and guanine form three hydrogen bonds. The hydrogen bonds allow the DNA strands to be held together and separated when needed for DNA replication and transcription.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on