why is the nucleus called the "control center" of the cell?

it controls all activity in the cell

what is a gene?

a segment of dna that codes for a particular protein

where in the cell is dna located

in the nucleus

dna can be found in what organelles

nucleus, mitochondria, and in chloroplasts.

what two scientist established the structure dna

James Watson and Francis Crick

replication is called semi-conservative because half the original strand is _________

conserved

what are the sides of the dna later made of