Cell Cycle and Cell Division
CBSE · Class 11 · Biology
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What is the cell cycle?
Answer
The cell cycle is the sequence of events by which a cell duplicates its genome, synthesizes other cellular constituents, and eventually divides into two daughter cells. It includes cell division, DNA …
What are the two main phases of the cell cycle?
Answer
The two main phases are: 1) Interphase - the phase between two successive divisions where the cell prepares for division, and 2) M Phase (Mitosis phase) - when actual cell division occurs.
What are the three sub-phases of interphase and their functions?
Answer
G1 phase: Cell grows and carries out normal metabolism, interval between mitosis and DNA replication. S phase: DNA synthesis and replication occurs, DNA amount doubles from 2C to 4C. G2 phase: Protein…
What is G0 phase?
Answer
G0 is the quiescent stage where cells exit G1 phase and become inactive. These cells remain metabolically active but do not proliferate unless needed. Examples include heart cells that rarely divide a…
What is mitosis and why is it called equational division?
Answer
Mitosis is the process of nuclear division where a diploid parent cell divides to produce two diploid daughter cells with identical genetic content. It's called equational division because the chromos…
What are the four stages of mitosis (karyokinesis)?
Answer
The four stages are: 1) Prophase - chromosome condensation begins, 2) Metaphase - chromosomes align at the equatorial plate, 3) Anaphase - sister chromatids separate and move to opposite poles, 4) Tel…
Describe the key events of prophase in mitosis.
Answer
Key events: 1) Chromosomal material condenses to form compact mitotic chromosomes, 2) Chromosomes appear as two sister chromatids joined at centromere, 3) Centrosomes move to opposite poles, 4) Asters…
What is the metaphase plate and what happens during metaphase?
Answer
The metaphase plate is the plane of alignment where chromosomes arrange at the cell's equator. During metaphase: 1) Nuclear envelope completely disappears, 2) Chromosomes are fully condensed, 3) Spind…
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- NCERT Official — ncert.nic.in
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- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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