Not all portions of DNA that are copied into mRNA are actually used to make protein. Instead, during RNA , a portion of the nucleotides are removed through RNA. . These removed portions are known as While the portions that remain are known as.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.