please answer questions 21-25 21. Which of the following is the most abundant form of chromatin in the interphase nucleus of a cell? A. Euchromatin B. Nucleoli C. Heterochromatin D. None are true. 2. Several components are required for DNA replication. Which of the following is required for unwinding the DNA at the replication fork? A. Telomerase. B. DNA helicase. C. DNA polymerase. D. Topoisomerase 23. Primase synthesizes short sequences of A. DNA; leading B. RNA; lagging complementary to the strand. 24. What is the function of karyapherins? C. DNA; lagging D. RNA: DNA template A. They attach to chromosomes in order to activate heterochromatin. B. They coat chromosomes. C. They transport D. They define the structure of Cajal bodies 5. Emery-Dreifuss muscular dystrophy and Hutchinson-Gilford progeria are caused by mutations in genes that code for A. importin or Ran. B. Polycomb proteins. C. NF-KB. D. lamins or emerin..