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How does meiosis begin?
Mitosis is the process by which a cell duplicates the chromosomes in its cell nucleus, in order to generate two, identical, daughter nuclei. It is generally followed immediately by cytokinesis, which divides the nuclei, cytoplasm, organelles and cell membrane into two daughter cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic (M) phase of the cell cycle, the division of the mother cell into two daughter cells, each with the genetic equivalent of the parent cell. Mitosis is the process by which a cell duplicates the chromosomes in its cell nucleus, in order to generate two, identical, daughter nuclei. It is generally followed immediately by cytokinesis, which divides the nuclei, cytoplasm, organelles and cell membrane into two daughter cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic (M) phase of the cell cycle, the division of the mother cell into two daughter cells, each with the genetic equivalent of the parent cell. Mitosis occurs exclusively in eukaryotic cells, but occurs in different ways in different species. For example, animals undergo an "open" mitosis, where the nuclear envelope breaks down before the chromosomes separate, while yeast such as Saccharomyces cerevisiae and fungi such as Aspergillus nidulansundergo a "closed" mitosis, where chromosomes divide within an intact cell nucleus.[1] In multicellular organisms, the somatic cells undergo mitosis, while germ cells - cells destined to become sperm in males or ova in females - divide by a related process called meiosis. Prokaryotic cells, which lack a nucleus, divide by a process called binary fission. The process of mitosis is complex and highly regulated. The sequence of events is divided into phases, corresponding to the completion of one set of activities and the start of the next. These stages are prophase, prometaphase, metaphase, anaphase and telophase. During the process of mitosis the pairs of chromosomes condense and attach to fibers that pull the sister chromatids to opposite sides of the cell. The cell then divides in cytokinesis, to produce two identical daughter cells. Because cytokinesis sis occurs exclusively in eukaryotic cells, but occurs in different ways in different species. For example, animals undergo an "open" mitosis, where the nuclear envelope breaks down before the chromosomes separate, while yeast such as Saccharomyces cerevisiae and fungi such as Aspergillus nidulans undergo a "closed" mitosis, where chromosomes divide within an intact cell nucleus.[1] In multicellular organisms, the somatic cells undergo mitosis, while germ cells - cells destined to become sperm in males or ova in females - divide by a related process called meiosis. Prokaryotic cells, which lack a nucleus, divide by a process called binary fission. The process of mitosis is complex and highly regulated. The sequence of events is divided into phases, corresponding to the completion of one set of activities and the start of the next. These stages are prophase, prometaphase, metaphase, anaphase and telophase. During the process of mitosis the pairs of chromosomes condense and attach to fibers that pull the sister chromatids to opposite sides of the cell. The cell then divides in cytokinesis, to produce two identical daughter cells
A cell organelle that breaks down food molecules and releases energy?
The mitochondria releases energy from food molecules. This is where all things are broken down and turned into energy for the cell.
An analogy for lysosome?
Think of a cell as a factory. The nucleus is the "boss", and lysosomes are like the "clean-up" crew after all the work has been done. they go around in the cell breaking down wastes; getting rid of it.
Why does the onion mixture processed through the blender?
The blending breaks down the cell walls, cell membranes and nuclear membranes allowing the release of DNA.
What breaks down food into what that cells can absorb What breaks down food?
1.) What breaks down food into what that cells can absorb what breaks down food ? The answer is B wich is Digestion . = Lexy.B
What happens to chromosomes before the nuclear membrane breaks down in mitosis?
Before the nuclear envelope of a cell breaks down during the mitosis process, the DNA has to be duplicated. After the envelope dissolves, the chromosomes separate, then the cell finally splits.
When do chromosomes become visible in the nucleus of a cell?
Chromosomes become visible in the nucleus of a cell during cell division, specifically during the prophase stage of mitosis or meiosis when the DNA condenses and coils tightly. This allows the chromosomes to be distinguished under a microscope.
The nucleus and nucleolus disappear during what?
The nucleus and nucleolus disappear during cell division, specifically during the prophase stage of mitosis. This is when the nuclear envelope breaks down, allowing the chromosomes to condense and become visible. The nucleolus also disappears as the cell prepares to divide into two daughter cells.
How does the nucleus change as the cell divides-?
The nucleus changes as the cell divides by completely disassembling itself and reforming. As mitosis begins, chromosomes condense, then the nucleolus disappears. As it continues to break down, most of the contents of the nucleus are released into the cytoplasm.
What phase of mitosis has no clear nucleus?
The phase of mitosis that has no clear nucleus is called prometaphase. In this phase, the nuclear envelope breaks down, allowing the chromosomes to become more condensed and visible, but the formation of the new nuclear envelope has not yet occurred.
Which stage of the following does nuclear envelope break down?
The nuclear envelope breaks down during prometaphase of mitosis and prophase of meiosis. This breakdown allows the chromosomes to be released from the nucleus and prepare for the subsequent stages of cell division.
What is mean by open mitosis and closed mitosis?
Open mitosis occurs in most animal cells where the nuclear envelope breaks down ("opens" before the chromosomes separate. Closed mitosis occurs in some fungi, such as Aspergillusand Saccharomycesspecies, where the chromosomes divide within an intact ("closed") cell nucleus.
What happens from interphase to prophase?
the DNA has condensed from chromatin into chromosomes Interphase has three distinct phases: G1, S, and G2. In G1, the cell grows after its last mitosis cycle. In S (for "synthesis"), the cell synthesizes another copy of DNA. In G2, the cell doubles all the organelles and prepares for the beginning of mitosis. During prophase, chromatin condenses into chromosomes and the nuclear envelope breaks down.
Is the nucleus visible during anaphase?
No, the nucleus is not visible during anaphase. In anaphase, the nuclear envelope breaks down, allowing the chromosomes to move to opposite poles of the cell.
What phase does the nucleus and nucleus disappear?
The phase where the nucleus and the nuclear membrane disappear is called prometaphase. This is the phase following prophase in mitosis or meiosis when the nuclear envelope breaks down and the chromosomes become more condensed and visible.
Why are bacteria unable to undergo mitosis?
Usually, only eukaryotes, such as the human cell, go through mitosis, and because most bacteria, prokaryotes, are single celled organisms, there's usually no need to go through all the complexities of mitosis, when they could just split and reform itself into its own duplicate.
Why is it important for the nuclear membrane to be broken down during mitosis?
The nuclear membrane breaks down during prophase, while the Deoxyribonucleic Acid (DNA) The nuclear membrane must break down to allow the chromosomes to be pulled apart and away from the area of the former nucleus towards the pole where the daughter cell will be formed. If the nuclear membrane did not break down the spindle fibers would not be able to reach the chromosomes and they would not be moved towards opposite poles of the cell.
