Question # 1

Necrosis is:

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Division of cells

Suicide of cells

Cell death by tissue damage

Weakness of cells

In which stage of the cell cycle each chromosomes is duplicated and so it consists of two chromatids?

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G I

S

M

G2

During the division phase the cell ................ into two.

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Split

Divide

Both

None

Plants lack ................... .

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Protein

Centrioles

Spindle fibers

Cytokisnesis

Down's sayndrome is an autosomal non-disjunction of chromosomes number ............. .

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22

12

21

14

If you observe a cell like this one, what phase of mitosis is it?

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Anaphase

Telophase

Metaphase

Prophase

The phases of cell cycle are:

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Interphase

Division phase

Both a and b

None

Programmed cell death is called ............... .

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Apoptosis

Necrosis

Both a & b

None

For mitosis, the chromosomes of the cells are duplicated during interphase. When do the chromosomes duplicated for meiosis?

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Before meiosis 1

Before meiosis 2

During Meiosis 1

Do not duplicate

The fund event of interphase occurs with .............. .

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Replication of DNA

Replication of centriol

Movement of centriol

Both a & b

What reason would you suggest for the fact that the total DNA content of each daughter cell is reduced during meiosis?

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Chromosomes do not replicate during the interphase before meiosis 1

Chromosomes do not duplicate between meiosis 1 and 2

Half of the chromosomes form each gamete are broken

Sister chromatids separate during anaphase of meiosis 1

Two consecutive cell division occurs in ..............

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Meiosis

Mitosis

Interphase

None

During which phase of mitosis spindles are formed?

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G2

Interphase

Prophase

Metaphase

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