CELL STRUCTURES AND FUNCTION
CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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replace cells that have died.
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create new chromosomes.
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obtain energy from sunlight.
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release energy from food.
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Detailed explanation-1: -When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two. Two cells become four and so on.
Detailed explanation-2: -In meiosis the germ cell divides into four sex cells, each cell consisting of half of the parent cell’s chromosomes. Mitosis is necessary for cell growth, repair, and regeneration. Dead cells are replaced by mitosis since the number of chromosomes is not changed in a cell after division in mitosis.
Detailed explanation-3: -Mitosis is the reason we can grow, heal wounds, and replace damaged cells. Mitosis is also important in organisms which reproduce asexually: this is the only way that these cells can reproduce. This is the one key process that sustains populations of asexual organisms.
Detailed explanation-4: -Cells produce new cells by cell division. Cell division is required for growth, repair, regeneration and reproduction. Eukaryotic cells divide by mitosis and meiosis cell division. Prokaryotic cells divide by binary fission.
Detailed explanation-5: -The cell cycle is a set of steps that take place in cell division. The cell cycle is how cells duplicate and divide. Cells need to divide all the time to replace dead cells, for growth and for repair.