centromeres. … that holds together the two chromatids (the daughter strands of a replicated chromosome). The centromere is the point of attachment of the kinetochore, a structure to which the microtubules of the mitotic spindle become anchored.
What holds the 2 halves of a chromosome together?
A chromatid is one of two identical halves of a replicated chromosome. … Following DNA replication, the chromosome consists of two identical structures called sister chromatids, which are joined at the centromere.
What hold the sister chromatids together to form a chromosomes?
During prophase, the parent cell chromosomes — which were duplicated during S phase — condense and become thousands of times more compact than they were during interphase. … Cohesin forms rings that hold the sister chromatids together, whereas condensin forms rings that coil the chromosomes into highly compact forms.
What is a centrosome?
A centrosome is a cellular structure involved in the process of cell division. … Proteins called microtubules assemble into a spindle between the two centrosomes and help separate the replicated chromosomes into the daughter cells.
What does a centrosome look like?
Centrosomes are made up of two, barrel-shaped clusters of microtubules called “centrioles” and a complex of proteins that help additional microtubules to form. This complex is also known as the microtubule-organizing center (MTOC), since it helps organize the spindle fibers during mitosis.
What is prophase in mitosis?
Prophase is the first phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses.
Which molecule holds sister chromatids together during mitosis and meiosis?
Cohesin holds sister chromatids together after DNA replication until anaphase when removal of cohesin leads to separation of sister chromatids. The complex forms a ring-like structure and it is believed that sister chromatids are held together by entrapment inside the cohesin ring.
What happens interphase?
During interphase, the cell grows and makes a copy of its DNA. During the mitotic (M) phase, the cell separates its DNA into two sets and divides its cytoplasm, forming two new cells.
What are centrioles and centrosomes?
Within the cell, a centrosome is a structure that organizes microtubules during cell division. Each centrosome contains “paired barrel-shaped organelles” called centrioles and a “cloud” of proteins referred to as the pericentriolar material, or PCM. … They also enable movement of other organelles within the cytoplasm.
What is centrosome and lysosomes?
Answer: Lysosomes are membrane-bound sacs of digestive enzymes that aid in the digestion and recycling of cellular material. … centrosomes : In cell biology, the centrosome is an organelle that serves as the main microtubule organizing center (MTOC) of the animal cell.
What is the function of a lysosome?
A lysosome is a membrane-bound cell organelle that contains digestive enzymes. Lysosomes are involved with various cell processes. They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria.