BOC 6 MOLECULAR BIOLOGY EXAM QUESTIONS WITH CORRECT ANSWERS + RATIONALES (A+ GRADED 2025/2026)

BOC 6 MOLECULAR BIOLOGY EXAM QUESTIONS WITH CORRECT ANSWERS + RATIONALES (A+ GRADED 2025/2026) 1. Which nucleotide pair has a high frequency of mutation in human chromosomal DNA? a. CC b. CG c. CA d. CT: CG (b) Spontaneous deamination of methylcytosine results in thymine formation; it occurs 2.5x more frequently than any other single nucleotide mutation. 2. During the G2 phase of the cell cycle, the DNA content of a cell is: a. haploid b. diploid c. triploid d. tetraploid: Tetraploid (d) The G2 phase of the cell cycle follows the S phase, where DNA content goes from 2N to 4N or from diploid to tetraploid. 3. Intervening sequences are found in: a. heteronuclear RNA b. mature mRNA c. ribosomal RNA d. transfer RNA: Heteronuclear RNA (a) Heteronuclear RNA is made up of newly transcribed mRNA that still contains intervening sequences. 4. Which is considered an epigenetic modification of DNA?