Describe Mitosis Stages - Biology
- Which stage comes immediately after metaphase in mitosis?
- Anaphase. Sister chromatid separation follows chromosome alignment.
- What is the defining event of metaphase?
- Chromosomes align at the metaphase plate. Chromosomes position for equal distribution to daughter cells.
- What is the centromere?
- Chromosome region that holds sister chromatids together. Attachment site for spindle fibers during chromosome movement.
- Which mitosis stage has chromosomes most condensed and easiest to count?
- Metaphase. Maximum condensation makes chromosomes clearly visible and countable.
- Which stage occurs immediately before mitosis and includes DNA replication?
- Interphase (S phase is when DNA replicates). Cell growth and DNA duplication prepare for division.
- What is the defining event of anaphase?
- Sister chromatids separate and move to opposite poles. Chromosome copies move to create two identical nuclei.
- Identify the mitosis stage described: sister chromatids move toward opposite poles.
- Anaphase. Sister chromatid separation and movement characterize this stage.
- Identify the mitosis stage described: two nuclei form and chromosomes decondense.
- Telophase. Nuclear reformation and chromosome decondensation occur here.
- Which mitosis stage includes re-formation of the nuclear envelope?
- Telophase. Nuclear compartments reform around separated chromosome sets.
- What is cytokinesis?
- Division of the cytoplasm to form two separate daughter cells. Physical separation creates two independent cells.
- Which stage comes immediately before telophase in mitosis?
- Anaphase. Nuclear reformation follows chromosome separation.
- Identify the structure that spindle microtubules attach to on each chromosome during mitosis.
- Kinetochore. Protein complex where spindle fibers attach to chromosomes.
- What are sister chromatids?
- Two identical copies of a replicated chromosome joined at a centromere. Result of DNA replication in S phase of cell cycle.
- What happens to the nuclear envelope during prometaphase?
- It breaks down. Nuclear barrier dissolves to allow spindle access to chromosomes.
- What structure forms the mitotic spindle?
- Microtubules. Protein filaments that move chromosomes during division.
- Which term describes the DNA-protein material before it condenses into chromosomes?
- Chromatin. Loosely organized DNA-protein complex in non-dividing cells.
- Which stage is described by formation of a cleavage furrow in an animal cell?
- Cytokinesis. Contractile ring formation divides animal cell cytoplasm.
- What is the relationship between mitosis and the cell cycle?
- Mitosis is the nuclear division phase of the cell cycle (M phase). Nuclear division is one component of complete cell reproduction.
- Which stage begins when cohesin is cleaved and sister chromatids can separate?
- Anaphase. Cohesin cleavage triggers sister chromatid separation.
- Choose the correct term: the plane where chromosomes align in metaphase is the ____.
- Metaphase plate. Imaginary equatorial plane where chromosomes align.
- Identify the stage when chromosomes are maximally condensed and aligned, but not yet separated.
- Metaphase. Chromosomes align but remain attached as sister chromatids.
- What happens to the nucleolus during prophase?
- It disappears. Ribosome assembly site dissolves as nuclear organization changes.
- What is a kinetochore?
- Protein complex on a centromere where spindle microtubules attach. Connection point between chromosome and spindle apparatus.
- What is the defining event of telophase?
- Nuclear envelopes reform around each set of chromosomes. Chromosomes are enclosed in separate nuclear compartments.
- Which process directly follows telophase to fully separate the two daughter cells?
- Cytokinesis. Cytoplasmic division completes cell reproduction process.
- Which mitosis stage includes alignment of chromosomes at the cell equator?
- Metaphase. Proper positioning ensures equal chromosome distribution.
- Identify the mitosis stage described: nuclear envelope breaks and microtubules attach to kinetochores.
- Prometaphase. Nuclear breakdown and spindle attachment define this transition.
- What is prometaphase?
- Stage when nuclear envelope breaks and spindle attaches to kinetochores. Transition phase between prophase and metaphase.
- What happens to the nucleolus during telophase?
- It reappears. Ribosome assembly site reforms in new nuclei.
- What happens to kinetochore microtubules during anaphase?
- They shorten to pull chromosomes toward the poles. Depolymerization creates pulling force on attached chromosomes.
- Identify the mitosis stage described: chromosomes condense and spindle begins to form.
- Prophase. Initial condensation and spindle formation characterize this stage.
- Identify the mitosis stage described: chromosomes line up at the metaphase plate.
- Metaphase. Chromosome alignment at cell center defines this stage.
- What happens to non-kinetochore microtubules during anaphase?
- They lengthen and push spindle poles apart. Elongation separates spindle poles and stretches the cell.
- What is the main event of prophase in mitosis?
- Chromatin condenses into visible chromosomes. DNA-protein complex becomes compact and visible under microscope.
- What is a centrosome in animal cells during mitosis?
- Microtubule-organizing center that forms spindle poles. Contains centrioles that organize spindle formation.
- What is the metaphase plate?
- Imaginary plane at the cell equator where chromosomes line up. Equatorial alignment ensures balanced chromosome distribution.
- What is the correct order of mitosis stages (excluding interphase and cytokinesis)?
- Prophase, metaphase, anaphase, telophase. Standard sequence of nuclear division stages.
- In animal cells, what structure forms to begin cytokinesis?
- A cleavage furrow. Pinching inward divides animal cell cytoplasm.
- Which mitosis stage includes separation of sister chromatids?
- Anaphase. Sister chromatids become independent daughter chromosomes.
- Identify the stage when a cell has two distinct nuclei forming within one cell body.
- Telophase. Two nuclei form before cytoplasm divides completely.
- What does the plant cell plate develop into after cytokinesis?
- A new cell wall between the daughter cells. Creates permanent barrier between daughter plant cells.
- What happens to chromosomes during telophase?
- They decondense back into chromatin. Chromosomes return to extended form for gene expression.
- In plant cells, what structure forms during cytokinesis?
- A cell plate. Plant cells build wall rather than pinch to divide.
- What is mitosis?
- Nuclear division that produces two genetically identical nuclei. Ensures genetic material is equally distributed to daughter cells.
- Where do centrosomes move during prophase?
- To opposite poles of the cell. Establishes bipolar spindle apparatus for chromosome separation.
- Which stage is missing from this correct sequence: prophase → ? → metaphase → anaphase → telophase?
- Prometaphase. Transition stage between prophase and metaphase.
- During anaphase, what does each separated sister chromatid become called?
- A daughter chromosome. Individual chromatid becomes independent chromosome after separation.
- Which mitosis stage includes spindle attachment to kinetochores?
- Prometaphase. Spindle-chromosome connections form during this transition stage.
- What must occur at kinetochores before anaphase begins?
- Each sister chromatid must be attached to opposite spindle poles. Ensures equal chromosome distribution through bipolar attachment.
- What forms the contractile ring that creates the cleavage furrow in animal cells?
- Actin and myosin filaments. Contractile proteins create constricting force for cell division.