Atree of life depicting the hypothetical phylogeny of the three domains is shown above. at which letter is located the common ancestor that would contain membrane-bound organelles? a) a b) b c) c d) d

When water freezes, it . contracts expands

Which statement about dna replication is true? a. eukaryotes only have one circular chromosome that unwinds at multiple locations. b. eukaryotes can only replicate one segment of a chromosome at a time. c. prokaryotes can only replicate their single circular chromosome in the nucleus. d. prokaryotes only have one origin of replication to initiate replication.

What happens during interphase? (1)the nucleus grows to its full size. (2)the cell grows to its full size. (3)the nucleus divides into two nuclei. (4)the cell divides into two cells.