4. The nucleolus A. is surrounded by a thin nucleolar membrane. B. is found in prokaryotes. C. contains tRNA. D. synthesizes ribosomal RNA. E. is found in prokaryotes and contains tRNA and rRNA 5. Stepwise condensation of linear DNA happens in five different packing processes. Which of the following four processes has a direct requirement for histone H 1 ? A. formation of "beads-on-a-string" B. formation of the 30 nm fiber C. looping of the 30 nm fiber D. packing of loops to form interphase chromosomes 6. Although the chromatin structure of interphase and mitotic chromosomes is very compact, DNA-binding proteins and protein complexes must be able to gain access to the DNA molecule. Chromatin-remodeling complexes provide this access by A. recruiting other enzymes B. modifying the N -terminal tails of core histones C. using the energy of ATP hydrolysis to move nucleosomes. D. denaturing the DNA by interfering with hydrogen-bonding between base pairs. 7. snRNAs A. are translated into snRNPs B. are important for producing mature mRNA transcripts in bacteria C. are removed by the spliceosome during RNA splicing D. can bind to specific sequences at intron-exon boundaries through complementary base-pairing 8. Which of the following statements is true? A. Each strand of DNA contains all the information needed to create a new double-stranded DNA molecule with the same sequence information. B. All functional DNA sequences inside a cell code for protein products. C. Gene expression is the process of duplicating genes during DNA replication. D. Gene sequences correspond exactly to the respective protein sequences produced from them..