1.According to Model 3, what term refers to loose DNA inside of a nucleus?
2.During what part of the cell cycle is the DNA in a cell’s nucleus replicated?
3.During what part of the cell cycle is the DNA in a cell condensed into chromosomes?
The Correct Answer and Explanation is :
- According to Model 3, what term refers to loose DNA inside of a nucleus?
The term that refers to loose DNA inside of a nucleus is chromatin. Chromatin is a complex of DNA and proteins (mainly histones) that is found in the nucleus of eukaryotic cells. When the cell is not dividing, the chromatin is in a loose, thread-like form, allowing it to be transcribed and replicated. - During what part of the cell cycle is the DNA in a cell’s nucleus replicated?
The DNA in a cell’s nucleus is replicated during the S phase (Synthesis phase) of the cell cycle. During the S phase, the entire DNA content of the cell is duplicated in preparation for cell division. This ensures that both daughter cells will have the same amount of genetic material as the parent cell. Replication is a tightly regulated process that involves the unwinding of the double helix, followed by the synthesis of a complementary strand for each original strand of DNA. - During what part of the cell cycle is the DNA in a cell condensed into chromosomes?
The DNA in a cell is condensed into chromosomes during prophase, which is the first stage of mitosis. In this phase, the chromatin fibers begin to coil and condense into visible chromosomes. Each chromosome consists of two sister chromatids connected at the centromere. The condensation of DNA is essential for ensuring that the genetic material is evenly distributed between the two daughter cells during cell division. This process makes it easier for the chromosomes to be segregated properly by the mitotic spindle.
Explanation:
The cell cycle is a series of events that take place in a cell, leading to its division and replication. It includes interphase (which consists of G1, S, and G2 phases) and mitosis (which is divided into prophase, metaphase, anaphase, and telophase). Chromatin exists in the cell during interphase when the cell is preparing for division. However, before a cell divides, the chromatin condenses to form chromosomes, ensuring the DNA is accurately replicated and divided. This organization is critical for maintaining the integrity of the cell’s genetic information and supporting the process of mitosis, where the cell splits into two genetically identical daughter cells.