AP BIOLOGY

Detailed explanation-1: -Eukaryotic DNA never leaves the nucleus; instead, it’s transcribed (copied) into RNA molecules, which may then travel out of the nucleus. In the cytosol, some RNAs associate with structures called ribosomes, where they direct synthesis of proteins.

Detailed explanation-2: -Transcription: DNA is too large to leave the nucleus. If the program it contains must leave the nucleus, an intermediate must be produced. This intermediate is called m-RNA. m-RNA is formed in the following way, RNA polymerase binds to, a region of the DNA called, the promoter.

Detailed explanation-3: -Structure of DNA. Most DNA is found inside the nucleus of a cell, where it forms the chromosomes. Chromosomes have proteins called histones that bind to DNA. DNA has two strands that twist into the shape of a spiral ladder called a helix.

Detailed explanation-4: -During replication, DNA does not leave the nucleus. This because all the machinery for replication, enzymes, and cofactors are found in the nucleus as well as the extra nucleotides.

Detailed explanation-5: -The correct answer is (D) RNA primase makes the RNA primer, while DNA Pol epsilon extends that primer with DNA. DNA polymerase epsilon is the enzyme that synthesizes new strands of DNA during replication.