Botany • ch2 • mitosis

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Questions and Answers

The complex process by which both nucleus and chromosome of a eukaryotic cell divide once is called

Mitosis

Which is the longest phase of mitosis?

Prophase (correct)

Prometaphase

Metaphase

Anaphase

Why mitosis is called equational division

Each chromosome including the centromere divides longitudinally into two equal parts and each part goes to the nearest pole. As a result no. of chromosomes of two newly produced cells is equal to the no. of chromosomes in mother cell. That is why...

Nucleus becomes larger in

Prophase Signup and view all the answers

Chromosomes becomes shorter & thicker in prophase

True Signup and view all the answers

Spindle fibers are formed from the centriole in plant cells

False Signup and view all the answers

Nuclear envelope completely disappear in

Prometaphase Signup and view all the answers

What is traction fibre

The fibre attached with centromere of chromosomes Signup and view all the answers

Arrangement of chromosomes at the equator of spindle apparatus in metaphase is called

Metakinesis Signup and view all the answers

Chromosomes becomes thickest, shortest and clearly visible in

Metaphase Signup and view all the answers

Hydration of chromosomes occurs in telophase

True Signup and view all the answers

Proteins responsible for formation of grooves in plasma membrane

Actin & Myosin Signup and view all the answers

What is free nuclear division

If karyokinesis continues but cytokinesis doesn't occur Signup and view all the answers

When tumour spreads to different parts of body it is called

Metastasis Signup and view all the answers

What is apoptosis

Genetically programmed cell death Signup and view all the answers

Chromosomal dance is seen in which stage of mitosis cell division

Prometaphase Signup and view all the answers

Which phase of mitosis involves conversation of each chromatid into daughter chromosomes

Anaphase Signup and view all the answers

What is mitotic index?

The ratio the number of cells undergoing mitosis to the total number of cells in a tissue Signup and view all the answers

Papilloma virus causes tumour

False Signup and view all the answers

Which genes of papilloma virus are responsible for cause of cancer

B6 Signup and view all the answers

Study Notes

Mitosis

Mitosis is the process of cell division in which both the nucleus and chromosomes divide once.
Prophase is the longest phase of mitosis.
Mitosis is called equational division because it results in two daughter cells that are genetically identical to the parent cell.
The nucleus becomes larger during interphase before mitosis begins.
Chromosomes become shorter and thicker during prophase.
Spindle fibers are formed from the centrioles in animal cells, not plant cells. During this process, the centrioles migrate to opposite ends of the cell, forming spindle poles.
The nuclear envelope completely disappears during prophase of mitosis.
Traction fibers are spindle fibers that attach to the centromeres of chromosomes during mitosis and pull them apart.
The arrangement of chromosomes at the equator of the spindle apparatus in metaphase is called the metaphase plate.
Chromosomes become thickest, shortest, and clearly visible during metaphase.
** Hydration of chromosomes** occurs during telophase.
Clathrin and dynamin are proteins responsible for the formation of grooves in the plasma membrane during cytokinesis.
Coenocytic cells have multiple nuclei but lack cell walls, while plasmodium cells are single-celled organisms with multiple nuclei.
Metastasis is the spread of cancer cells to different parts of the body.
Apoptosis is programmed cell death, a natural process that eliminates unwanted cells without causing inflammation.
Chromosomal dance is seen during anaphase of mitosis.
Telophase is the phase of mitosis where each chromatid becomes a daughter chromosome.
Mitotic index is the ratio of cells in mitosis to the total number of cells in a tissue.
Papillomavirus causes tumors.
E6 and E7 genes of papillomavirus are responsible for causing cancer. They interfere with the cell cycle regulation, leading to uncontrolled cell growth.