Multiple Choice
Which phase of mitosis is characterized by the alignment of chromosomes along the metaphase plate?
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11. Cell Division
Phases of Mitosis
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During prophase of mitosis, how many DNA molecules are present in each cell?
A
Four times the number of the original cell's chromosomes
B
The same number as the original cell's chromosomes
C
Half the number of the original cell's chromosomes
D
Twice the number of the original cell's chromosomes
Verified step by step guidance1
Understand that during prophase of mitosis, the cell has already replicated its DNA during the S phase of the cell cycle.
Recall that each chromosome consists of two sister chromatids after DNA replication. Therefore, each chromosome is represented by two DNA molecules.
Recognize that the number of DNA molecules is twice the number of chromosomes because each chromosome is made up of two sister chromatids.
If the original cell has 'n' chromosomes, then during prophase, there will be '2n' DNA molecules present in the cell.
Conclude that during prophase of mitosis, the number of DNA molecules is twice the number of the original cell's chromosomes.
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