What is Chargaff’s ratio? () A: In any organisms, amount of Adenine is the same as Thymine, amount of Cytosine is the same as Guanine. B: In any organisms, amount of Adenine is the same as Cytosine, amount of Thymine is the same as Guanine. C: In any organisms, amount of Adenine is the same as Guanine, amount of Thymine is the same as Cytosine.

哪些核苷酸碱基存在于RNA中？ A: adenine, guanine, cytosine, thymine B: adenine, guanine, thymine C: adenine, guanine, cytosine, uracil D: sugar, phosphate and base

The major nitrogenous waste of bony fishes is ( ). A: ammonia B: urea C: uric acid D: guanine E: creatine

If a sample of DNA extracted from a culture of cells is found to have 18% guanine, what would the expected proportion of thymine be from this culture? A: 18% B: 32% C: 36% D: 64%

The following genes ____________________ for the regulation of cell cycle are housekeeping genes in humans. A: Rho GTPase-activating protein 5 (ARHGAP5) & Rho GDP-dissociation inhibitor 1 (ARHGDIA) B: Rho guanine nucleotide exchange factor 7/11/40 (ARHGEF7/11/40) & Ras-related protein Rab-10 (RAB10) C: centromere protein B (CENPB), centromere protein T (CTBP1), & E3 ubiquitin-protein ligase (CCNB1IP1) D: cyclin-K (CCNK), cyclin-H (CCNH), & protein phosphatase 1 regulatory subunit 7 (PPP1R7)