CELL STRUCTURES AND FUNCTION
CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A caterpillar that grows larger over the summer
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A seal that is swimming through icy water
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A maple tree that is losing its leaves in autumn
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All of the above
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Detailed explanation-1: -A cell spends most of its time in what is called interphase, and during this time it grows, replicates its chromosomes, and prepares for cell division. The cell then leaves interphase, undergoes mitosis, and completes its division.
Detailed explanation-2: -As a cell expands in volume, its surface area/volume ratio diminishes, resulting in slowed transfer of gases and nutrients. In order to avoid these issues with size, a cell grows and eventually divides to form two “daughter” cells, each with its own complete copy of DNA.
Detailed explanation-3: -There are two stages in the cell cycle marked by the replication of organelles and protein synthesis: G1 and G2. G1 follows mitosis and allows the cell to grow. G2 occurs just before mitosis, and ensures that both daughter cells will have adequate organelles.
Detailed explanation-4: -Meristematic tissue is responsible for the growth processes in plants. The cells of these tissues can divide. It is found mostly at the tip of roots, stems, branches, leaves, buds where there is active growth.