NEET BIOLOGY

CELL STRUCTURES AND FUNCTION

CELL DIVISION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

During which phase does the nuclear membrane disappears, centrosomes disappear, and the spindle apparatus forms?

A	interphase
B	prophase
C	metaphase
D	anaphase

Explanation:

Detailed explanation-1: -During prophase, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down.

Detailed explanation-2: -Prophase is characterized by condensation of the DNA. Also during prophase, the nuclear membrane and the nucleolus disappear and the mitotic spindle forms.

Detailed explanation-3: -During metaphase, the nuclear membrane disappears and the chromosomes become aligned half way between the centrioles.

Detailed explanation-4: -The nuclear membrane dissolves, marking the beginning of prometaphase. Proteins attach to the centromeres creating the kinetochores. Microtubules attach at the kinetochores and the chromosomes begin moving. Spindle fibers align the chromosomes along the middle of the cell nucleus.

Detailed explanation-5: -Telophase. The spindle disappears, a nuclear membrane re-forms around each set of chromosomes, and a nucleolus reappears in each new nucleus. The chromosomes also start to decondense.

There is 1 question to complete.