CELL DIVISION
THE CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An increase in the concentration of lipids.
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A decrease in the amount of usable amino acids.
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A decrease in the amount of carbohydrates.
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An increase in the concentration of nucleotides.
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Detailed explanation-1: -Q. If you were testing the concentration of various macromolecules during an experiment which of the following would be expected during S-phase ? An increase in the concentration of lipids.
Detailed explanation-2: -S phase. In S phase, the cell synthesizes a complete copy of the DNA in its nucleus. It also duplicates a microtubule-organizing structure called the centrosome. The centrosomes help separate DNA during M phase.
Detailed explanation-3: -Which of the following best describes how the amount of DNA in the cell changes during M phase? The amount of DNA is halved as the cell divides into two daughter cells.
Detailed explanation-4: -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-5: -Between G1 and S phase, three DNA damage checkpoints occur to ensure proper growth and synthesis of DNA prior to cell division. Damaged DNA during G1, before entry into S phase, and during S phase result in the expression of ATM/R protein.