What does A in the figure above
represent
centromere
centriole
sister chromatid
spindle
Without a specific figure provided, I will provide general explanations for each term:
1. A: Without context, it is difficult to determine a specific meaning for "A" in a figure. It could represent different things depending on the context of the figure. For example, it could refer to a particular structure, molecule, or any other relevant component in the given figure.
2. Centromere: The centromere is a specialized region of a chromosome. It holds the sister chromatids together during cell division and plays a crucial role in the equal distribution of genetic material to daughter cells. The location of the centromere on a chromosome can vary, resulting in different types of chromosomes (e.g., metacentric, submetacentric, acrocentric, or telocentric).
3. Centriole: Centrioles are small cylindrical structures found in animal cells. They are primarily involved in cell division, specifically in the formation of the spindle apparatus. Centrioles duplicate during the cell cycle and migrate to opposite ends of the cell, contributing to the organization of the mitotic spindle.
4. Sister chromatid: Sister chromatids are two identical copies of a replicated chromosome formed through DNA replication during the S phase of the cell cycle. They are attached to each other at the centromere region until they separate during cell division, ensuring that each daughter cell receives an identical set of genetic material.
5. Spindle: The spindle, also known as the mitotic spindle, is a structure composed of microtubules that forms during cell division (mitosis or meiosis). It plays a vital role in separating sister chromatids and guiding their movement to opposite poles of the cell. The spindle apparatus ensures accurate distribution of chromosomes during cell division.
fiber
Answer: Sister chromatid