AP BIOLOGY

CELL DIVISION

THE CELL CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In prophase of mitosis, chromosomes
A
form and the nuclear envelope disappears.
B
are pulled toward opposite ends of the cell.
C
chromosomes line up along the equator of the cell
D
chromosomes begin to decondense and the two new nuclei begin to form.
Explanation: 

Detailed explanation-1: -At the beginning of mitosis, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down, resulting in the release of most of the contents of the nucleus into the cytoplasm.

Detailed explanation-2: -Nuclear membrane starts disappearing at the start of mitosis and by the late prophase it disappears completely along with the major cell organelles. The nuclear membrane disappears presumably to allow more space for karyokinesis and proper separation of chromatids.

Detailed explanation-3: -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.

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