Read the following statements regarding the S phase of the cell cycle: (A) The amount of DNA per cell doubles from 2C to 4C during S phase. (B) The chromosome number increases from 2n to 4n during S phase. (C) In animal cells, the centriole duplicates in the cytoplasm during S phase. (D) DNA replication begins in the cytoplasm during S phase. How many of the above statements are correct?

Step-by-step solution

Statement (A) is correct: During the S phase, the amount of DNA per cell doubles (e.g., from 2C to 4C). Statement (B) is incorrect: There is no increase in the chromosome number during the S phase; a diploid cell (2n) remains 2n. Statement (C) is correct: In animal cells, centriole duplication occurs in the cytoplasm during the S phase. Statement (D) is incorrect: DNA replication begins in the nucleus, not the cytoplasm. Therefore, exactly two statements (A and C) are correct. Answer: Two