In order to package the 3x109 nucleotides of DNA into the nucleus, the DNA is wound around histones. These are proteins that bind to the DNA. The interaction of histones and DNA involves:
举一反三
- Which of the following statements about non-coding DNA is true ()? A: DNA sequences that do not encode proteins B: DNA sequences that do not encode RNA and proteins C: DNA sequence without function D: DNA sequence without phenotype after deletion<br/>[单选题][2分][难度3]
- 以下哪个与基因表达激活有关 (Which of the following is associated with activation of gene expression ?) A: H3K4甲基化 (H3K4 methylation) B: H3K9甲基化 (H3K9 methylation) C: DNA promoter的甲基化 (Methylation of DNA promoter) D: 组蛋白的去乙酰化 (Deacetylation of histones)
- The B form DNA is the only natural conformation of DNA.()
- The A form and Z form DNA are not the natural conformation of DNA.
- The role of RNA primer during DNA replication is A: to guide DNA polymerase to bind with DNA template B: to provide 5’ phosphate end C: to provide attachment sites for four kinds of NTP D: to provide 3’-OH end to initiate synthesis of new DNA