Introduction:
Cell division occurs through a highly regulated series of steps called the cell cycle. The genetic stability of the cell is maintained by this process, while helping the cell to multiply. Multiplication may be necessary during growth, regeneration, and repair. But uncontrolled entry into various stages of cell cycle may lead to formation of dysfunctional cancer cells. Thus, strict regulation of entry into the stages is essential. This is done at cell cycle checkpoints, where the cell decides whether to enter the next stage or halt the process of cell division. Many factors may influence this regulation, like presence of growth factors, DNA damage, availability of nutrients, etc.
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Anatomy & Physiology: The Unity of Form and Function
- S. Chromosomes are duplicated during what stage of the cell cycle? G1 phase S phase prophase prometaphasearrow_forwardIn the cell cycle, at which stages do two chromatids make up one chromosome? a. beginning of mitosis b. end of G1 c. beginning of S d. end of mitosis e. beginning of G2arrow_forwardAll of the following are stages of mitosis except _________. a. prophase b. interphase c. metaphase d. anaphasearrow_forward
- Separation of the sister chromatids is a characteristic of which stage of mitosis? a. prometaphase b. metaphase c. anaphase d. telophasearrow_forwardDuring which one of the following phases of the cell cycle does the nucleus divide? O Interphase G2 phase S phase O G1 phase M phasearrow_forwardWhich of the following is NOT correct answer about telophase of mitosis: The mitotic spindle is formed in this phase Two new nuclei form, and two sets of chromosomes Nuclear membrane and nucleoid reappear in this phase The enzyme aminoacyl TRNA synthetase charges the TRNA molecules with the correct amino acids FRNA molecules with the correct amino acids MRNA molecules with the correct amino acidsarrow_forward
- The cell cycle is an internally regulated process and not affected by external signals. True or false explain whyarrow_forwardThe process of cellular reproduction or divisions is a heavily regulated process for a number of different reasons. In the case of the eukaryotic cell there are a number of different checkpoints that a cell must pass before it can continue on. Please explain what those checkpoints are looking for and where those checkpoints are in the cell cycle. If a cell doesn’t pass any of these checkpoints what happens to those cells?arrow_forwardSelect the phase of the cell cycle depicted in the image below where chromatin condenses and the nuclear membrane dissolves: prophase telophase metaphase anaphase interphasearrow_forward
- Select the phase of the cell cycle depicted in the image below where the paired chromosomes separate and move to opposite sides of the cell: prophase telophase interphase anaphase metaphasearrow_forwardin which of the phases of the cell cycle do sister chromatids form? -g2 phase of interphase -g1 phase of interphase -m phase (mitosis) -s phase of interphase -c phase (cytokinesis)arrow_forwardSelect the phase of the cell cycle depicted in the image below where new membranes form around the daughter nuclei and the chromosomes are separated. telophase interphase prophase anaphase metaphasearrow_forward
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