Tinoco Exam1 Practice Key.pdf - 1. Meselson and Stahl grew...

1. Meselson and Stahl grew cells in 15 N, then shifted the cells to grow in 14 N for two
generations. Pretend Meselson and Stahl’s concluded that DNA replicated via a
dispersive model. What would the data look like if this model was actually
happening? Select the best answer. 7 points
a. Two density bands, one in 14 N and one in 15
b. One density band between 14/15 N hybrid and the 14
c. One density band between 14 N and 15
d. Two density bands, one in 15 N and one hybrid 14/15
N.
N.
N
N.
2. An Italian family was found to have a long history of breast, ovarian, and prostate
cancer. A 62yr old patient from this family developed breast cancer and her
BRCA2 gene was sequenced. Her nucleotide sequence and that of a healthy
subject are shown below. What can you conclude from this data? Select the best
answer. 7 points