Which correctly describes sister chromatids? (1 point)
A. They make up the mitotic spindle within the cell.
B. They form during metaphase when DNA is being replicated.
C. They are the daughter cells that form during cell replication.
D. They are part of the lined-up chromosomes in mitosis.
D. They are part of the lined-up chromosomes in mitosis.
D. They are part of the lined-up chromosomes in mitosis.
To find the correct answer to this question, we can analyze each option and determine which one accurately describes sister chromatids.
Option A states that sister chromatids make up the mitotic spindle within the cell. However, this is not correct. Sister chromatids do not make up the mitotic spindle. The mitotic spindle is made up of microtubules and is responsible for separating the sister chromatids during cell division.
Option B suggests that sister chromatids form during metaphase when DNA is being replicated. This is also incorrect. Sister chromatids are formed during DNA replication in the S phase of the cell cycle, which occurs before metaphase.
Option C states that sister chromatids are the daughter cells that form during cell replication. This is not accurate. Sister chromatids are not the daughter cells; they are replicated copies of a single chromosome.
Option D correctly describes sister chromatids as part of the lined-up chromosomes in mitosis. During mitosis, the sister chromatids are aligned along the center of the cell and then separated to opposite poles by the mitotic spindle.
Therefore, the correct answer is Option D: They are part of the lined-up chromosomes in mitosis.