CELL STRUCTURES AND FUNCTION
CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the proper time when a cell is mature
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the opening of a cell so that it can be duplicated
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the beginning of a cell’s life
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the first phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells
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Detailed explanation-1: -Prophase is the first phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses.
Detailed explanation-2: -Mitosis is a fundamental process for life. During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells.
Detailed explanation-3: -Pairing of homologous chromosomes does not occur in the prophase of mitosis, whereas homologous chromosomes pair up in prophase I of meiosis I. In the prophase of mitosis, recombination, and crossing over do not take place. In prophase, I of meiosis I, recombination, crossing over, and synapsis takes place.
Detailed explanation-4: -Prophase I During zygotene, homologous chromosomes begin to align along their entire length by a process called synapsis that is necessarily precise. Each pair of chromosomes is held together by a ribbon-like protein and forms the synaptonemal complex.
Detailed explanation-5: -Prophase I is divided into 5 distinctive sub-stages: Leptotene – The chromosomes begin to condense and are attached to the nuclear membrane via their telomeres. Zygotene – Synapsis begins with a synaptonemal complex forming between homologous chromosomes.