Question

Can anyone explain this to me? ​

Answer 1

Answer:

C

Explanation:

1. After 4 replication of DNA, you have 16 molecules = 32 single-strands. Because you raise the cells in a heavy medium --> just 2 original strands is light.

2. Light single-strands pair with heavy single-strands (because in a heavy medium) --> bands in the middle. Others strands is heavy --> bands in the bottom.