in what phase does dna become visible strands
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Biology homework help please? im struggling? During prophase, when cell chromosomes become visible, what are the duplicated strands of DNA called? What is the name for the area in which these duplicated strands are joined?2.What structures are spindle fibers attached to that help pull the paired chromosomes apart? 3.The chromosomes separate and begin to move to opposite sides of the cell.14.hat is the name for the area in which these duplicated strands are joined? 2.What structures are spindle fibers attached to that help pull the paired chromosomes apart? 3.The chromosomes separate and begin to move to opposite sides of the cell. 14.
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LIST THE PHASES OF THE CELL CYCLE WITH A BRIEF DESCRIPTION OF WHAT OCCURS IN EACH PHASE? Best Answer: G1 phase - growth and synthesis. Gap phase 1 begins at the completion of mitosis and cytokinesis and lasts until the beginning of S phase. This phase is generally the longest of the four cell cycle phases and is quite variable in length. During this phase, the cell chooses either to replicate its deoxyribonucleic acid (DNA) or to exit the cell cycle and enter a quiescent state (the G0 phase). S phase Replication of the chromosomes is restricted to one specific portion of interphase, called S phase (DNA synthesis phase), which typically lasts about 6 h.
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Why Are individual Chromosomes more dufficult to see during interphase than during mitosis? This is called the interphase. Just before cell division, the chromosomes are duplicated. This is called the S phase. Then mitosis occurs. To facilitate separation of DNA, the chromosomes condense and become visible under light microscopy. Only during the M phase (mitosis) chromosomes are visible.
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The Biochemical Reactions An observation: When a cell in G2 of the cell cycle is fused with a cell in S phase, the DNA of the G2 nucleus does not begin replicating again even though replication is proceeding normally in the S-phase nucleus. Not until mitosis is completed, can freshly-synthesized DNA be replicated again.
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McDougal Littell Science Cells and Heredity Although mitosis is a continuous process, scientists divide the events of mitosis into four phases. 1  1 Chromosomes form. 2  During prophase, the DNA in the nucleus of a cell condenses and becomes visible under a light microscope. 3  Each chromosome consists of two identical chromatids held together by a centromere.
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What Must Happen to the DNA Strands in the Nucleus Before the Cell Can Divide? After making a copy of all DNA strands, the cell must check the DNA for any breaks before starting mitosis. This happens during the G2 phase of the cell cycle. The cell has protein machines that can detect breakages in DNA.
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DNA Replication: An Engineering Marvel The next stage of the process is known as the elongation phase. This is the stage at which the DNA strands are copied into daughter strands by the replication machinery. The synthesis of the new daughter strand from each of the parent strands is catalyzed by an enzyme complex known as DNA polymerase.
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During which stage of the cell cycle does DNA replication occur? At mid-interphase. The DNA replicates during the S phase of interphase, after G1 and before G2, the two growth phases. Throughout interphase, the DNA is extended, and … free nucleotides have access to the strands. During division (M phase) the DNA is condensed, so that the chromosomes are short, compact, and easily moved to the poles of the spindle.
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Animal Cell Replication? Events during Mitosis. Interphase: Cells may appear inactive during this stage, but they are quite the opposite. This is the longest period of the complete cell cycle during which DNA replicates, the centrioles divide, and proteins are actively produced.For a complete description of the events during Interphase, read about the Cell Cycle.naphase: Spindle fibers shorten, the kinetochores separate, and the chromatids (daughter chromosomes) are pulled apart and begin moving to the cell poles. Telophase: The daughter chromosomes arrive at the poles and the spindle fibers that have pulled them apart disappear.
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- Fourth Reconstruction Act passed. Fourteenth Amendment ratified. Entitles all persons born or naturalized in the United States to citizenship and equal protection under the laws of the United States.
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DNA Replication and Checkpoint Control in S Phase The Leading and Lagging Strands. The DNA strand that is synthesized in the 5' to 3' direction is called the leading strand. The opposite strand is the lagging stand, and although it is also synthesized in the 5' to 3' direction, it is assembled differently. As a rule, none of the known DNA polymerases adds a nucleoside triphosphate onto a free 5' end.
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- and nuclear membrane is visible _____ DNA scrunches up and chromosomes are first visible _____ Made up of G1, S, G2 _____ Chromosomes line up in middle of cell Prophase (P) Metaphase (M) Anaphase (A) Telophase (T) Interphase (I)
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Mitosis In the drawings below, you can see the chromosomes in the nucleus going through the process of mitosis, or division. If you have a microscope (400X) and a properly stained slide of the onion root tip (or allium root tip), you can see the phases in different cells, frozen in time.You will be looking at strands of DNA inside the cell! PHASES OF MITOSIS First Phase is called Prophase, the DNA molecules of the chromosomes condense.n the drawings below, you can see the chromosomes in the nucleus going through the process of mitosis, or division. If you have a microscope (400X) and a properly stained slide of the onion root tip (or allium root tip), you can see the phases in different cells, frozen in time.
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MADMAN BIOLOGY During the cell cycle, DNA replication occurs during the S-phase portion of the interphase. Interphase occurs between cell divisions and is a necessary precursor step for cell division. Continue Reading.
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In animal cells, which structure is thought to prodece the spindle fibers that help separate sister chromatids? When the cell is ready to begin mitosis or meiosis, each DNA molecule (which is an integral part of the chromosome) replicates or makes an exact copy of itself. The copying process produces a chromosome with two identical functional strands called chromatids, both attached to a common centromere.
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DNA Is Condensed in What Phases? Once cell division is triggered, the DNA inside the nucleus duplicates and the chromatin within the cells nucleus begins to condense. Prior to prophase, DNA is visible under a light microscope as a dark blur. Before prophase, a normal cell contains 23 pairs of chromosomes. After prophase, the cell contains 46 pairs of chromosomes -- two copies of each pair -- known as sister chromatids, joined at a centromere to form an X-shape.
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When cell chromosomes become visible what are the duplicated strands of dna called? During Prophase I, DNA is exchanged between homologous chromosomes.Meiosis begins when a cell's chromosomes are duplicated by a round of DNA.
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Section 19.5 Microtubule Dynamics and Motor Proteins during Mitosis Although the chromosomes are not visible by light microscopy during this period, DNA replication occurs during the S (synthesis) phase of interphase (see Figure 13-1). Figure 19-34 depicts the characteristic series of events that can be observed by light microscopy during mitosis in a eukaryotic cell.
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Replication and Distribution of DNA during Mitosis Figure 1: During prophase, the chromosomes in a cell's nucleus condense to the point that they can be viewed using a light microscope. Prophase is the first phase of mitosis. During this phase, the chromosomes inside the cell's nucleus condense and form tight structures. In fact, the chromosomes become so dense that they appear as curvy, dark lines when viewed under a microscope (Figure 1).
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- Interphase begins with G 1 (G stands for gap) phase. During this phase, the cell makes a variety of proteins that are needed for DNA replication. S phase. During S phase, which follows G 1 phase, all of the chromosomes are replicated.Following replication, each chromosome now consists of two sister chromatids (see figure below).uring this phase, the cell makes a variety of proteins that are needed for DNA replication. S phase. During S phase, which follows G 1 phase, all of the chromosomes are replicated. Following replication, each chromosome now consists of two sister chromatids (see figure below).
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- It's generally agreed upon that chromosomes become visible during prophase of the cell cycle. Some scientists will say prometaphase (sort of a bridge between prophase and meta…phase). Mitosis would occur after telophase of the cell cycle (Prophase, Metephase, Anaohase, Telophase). TheQuizer.
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The Cell Cycle S phase. S phase, or synthesis, is the phase of the cell cycle when DNA packaged into chromosomes is replicated. This event is an essential aspect of the cell cycle because replication allows for each cell created by cell division to have the same genetic make-up.
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- When replication begins, the two parent DNA strands are separated. One of these is called the leading strand, and it is replicated continuously in the 3' to 5' direction. The other strand is the lagging strand, and it is replicated discontinuously in short sections.
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During Which Stage of the Cell Cycle Does DNA Replication Occur? During the S phase, the chromosomes within the cell are copied so that the divided cells have matching copies of DNA. The cell then undergoes the more visibly active stages of cell division: prophase, anaphase, telophase and cytokinesis. Typical human cells take around 24 hours to complete a full cycle of cell replication and division.
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Biology 10.2 In the S phase(DNA replication) the cell makes new DNA and chromosomes. (At the end of this phase there is twice as much DNA as the cell started with
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Biology Exams 4 U Formation of leading strand begins immediately at the beginning of replication. 1. Lagging strand is a replicated strand of DNA which is formed in short segments called Okazaki fragments. Its growth is discontinuous. 2. DNA-ligase is required for joining Okazaki fragments. 3.