Cytokinesis begins during_____ of mitosis.
late prophase
early anaphase
early prophase
late anaphase
The Correct Answer is D
A. late prophase: During late prophase, chromosomes condense and the mitotic spindle forms, but cytokinesis has not yet begun as the cell is still preparing for chromosome alignment.
B. early anaphase: Early anaphase involves the separation of sister chromatids toward opposite poles. Cytokinesis does not start at this point because chromosome separation is still in progress.
C. early prophase: Early prophase is the initial stage of mitosis where chromatin condenses into visible chromosomes. Cytokinesis is not initiated at this stage.
D. late anaphase: Cytokinesis begins during late anaphase, when the cell starts forming a cleavage furrow as the chromosomes near the poles. This process continues into telophase, ultimately dividing the cytoplasm into two daughter cells.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
False:Cellular respiration is a catabolic reaction because it breaks down glucose into carbon dioxide and water while releasing ATP. The breakdown of molecules to generate usable energy is characteristic of catabolic processes, not anabolic ones.
Correct Answer is E
Explanation
A. tight junctions:Tight junctions form a seal between epithelial cells, preventing leakage of substances between them and helping maintain distinct apical and basal cell surfaces. They are essential for barrier functions in epithelial tissue.
B. gap junctions:Gap junctions provide channels for communication and ion exchange between cells rather than strong attachment. While important for coordination, they are not the main structures that firmly hold epithelial cells together.
C. desmosomes:Desmosomes are anchoring junctions that strongly attach epithelial cells to each other, providing structural integrity and resistance to mechanical stress. They are vital in tissues subject to stretching.
D. both A and B:While tight junctions are involved in attachment, gap junctions serve mainly for communication rather than physical adhesion.
E. both A and C:Epithelial cells are held together primarily by tight junctions for sealing and desmosomes for strength, combining barrier function with mechanical support.
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