Biology

An original cell replicates its DNA. The cell undergoes mitosis and cell division, and one of the daughter cells replicates its DNA. Which of these BEST describes the DNA of the second-generation daughter cells?

(A) One of the cells will contain DNA consisting of one strand from the original cell.
(B) One of the cells will contain DNA consisting of two strands from the original cell.
(C) Both of the cells will contain DNA consisting of one strand from the original cell.
(D) Both of the cells will contain DNA consisting of two strands from the original cell.
(E) Neither of the cells will contain DNA consisting of strands from the original cell.
  1. Correct Answer: A

    Explanation:

    DNA replication is semiconservative. During the first round of replication, each original single strand pairs with a new complementary strand. The first-generation daughter cells each have DNA consisting of one original and one new strand. During replication, the single original strand will pair with a new strand. The other double strand will consist of nonoriginal DNA.

Test ID: 1327
Source: SAT Biology Practice Tests