Online Test

Question # 1

The Klinefelter's syndrome males have an extra .................... .chromosomes.

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Sex

Autosome

Both 1 & b

None

Independent assortment occurs during .................... .

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Meiosis I

Meiosis II

Mitosis

None

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

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Apoptosis

Necrosis

Both a & b

None

In which stage of the cell cycle most cells spend their lives?

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Prophase

Metaphase

Interphase

Telohase

During which phase of mitosis spindles are formed?

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G2

Interphase

Prophase

Metaphase

Which of the following is unique to mitosis and not a part of meiosis?

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Homologous chromosomes pair forming bivalents

Homologous chromosomes cross over

Chromosomes pairs are broken during anaphase

Chromatids separate during anaphase

Which of the following distinguishes meiosis from mitosis?

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The chromosome number is reduced

Chromosomes undergo crossing over

The daughter cells are genetically different from the parent cell.

All of the above

The longest phase is:

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Mitotic phase

Meiosis

Cell cycle

Interphase

Which event distinguishes meiosis from mitosis?

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Condensation of chromosomes

Loss of the nuclear membrane

Formation of metaphase plate

Pairing of homologous chromosomes

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

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Protein

Centrioles

Spindle fibers

Cytokisnesis

Necrosis is:

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Division of cells

Suicide of cells

Cell death by tissue damage

Weakness of cells

Cytokinesis in animals take place by:

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Furrow

Phragmoplast

Telophase

None of these

the division of cytoplasm is called ............. .

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Karyokinesis

Cytokinesis

Anaohase

Telophase

Prior to cell division, each chromosome replicates or duplicates its genetic material. The products are connected by a centromere and are called:

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Sister chromosomes

Homologous Chromosomes

Non-sister chromatids

Sister chromatids

................ occurs in somatic cells.

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Meiosis I

Meiosis II

Mitosis

None

Which one of the followings stage is similar in mitosis and meiosis?

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Prophase

Anaphase

Metaphase

Telophase

Which of the following structure is absent in animals?

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Spindle

Centrioles

Chromatids

Phragmoplant

Nuclei of human cell contain ............ autosomes.

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23 pairs

22 pairs

12 pairs

14 pairs

Cytokinesis in a plant cell is characterized by:

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The equal division of homologous chromosomes

A pinching off of the cell membrane to divide the cell

The formation of a cell plate in the cytoplasm

The movement of the chromosomes from the metaphase plate

Crossing occurs during ..................... .

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Meiosis

Mitosis

Meiosis II

None

Necrosis is death due to ............ cell damage.

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Unexpected

Accidental

Both a & b

None

Who introduced Taxon of 'order' in classification?

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Caesalpino

John Ray

Tournefort

Rivinus

RNA, ribosomes and enzyme are synthesized during .............. .

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G2-phase

S-phase

G1-phase

Inretphase

Find the correct statement.

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Homologous chromosomes form pairs during mitosis

Chromosomes do not duplicate in the interphase preceding meiosis-I

Homologous chromosomes form pairs during mitosis but not mitosis

Spindles are not required during meiosis

The division of nucleus is:

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Mitosis

Karyokinesis

Cytokinesis

Meiosis

Which phase of meiosis is similar to mitosis?

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Prophase I

Telophase II

Meiosis I

Meiosis II

Example of Apoptotic process is ............... .

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Disappearance of tadpole tail

Disappearance of web human hand

Formation of fingers of hand

All of the above

Prior to cell replicates or duplicates its genetic material , the products are connected by a centromere and are called:

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Sister chromosomes

Homologous chromosomes

Non-sister chromatids

Sister chromatids

Karyokinesis is division..................... .

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Nucleus

Cytoplasm

DNA

proteins

Which event distinguishes meiosis form mitosis?

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Condensation of chromosomes

Loss of the nuclear membrane

Formation of metaphase plate

Pairing of homologous chromosomes

the failure of replicated chromosomes to separate during meiosis is ............... .

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Disjunction

Non-disjunction

Both a & b

None

A membrane-bounded disc is formed in plant cell to divide cytoplasm, this is called:

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Chloroplast

Phragmoplast

Leucoplast

Chromoplast

The process of mitosis ensures that:

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Each new cell is genetically different from its parent

Each new cell receives the proper number of chromosomes

Cell will divide at the appropriate time

Chromosomes duplicated without errors.

Which one of the following stages of cell division is very different for animal and plant cells?

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Prophase

Metaphase

Anaphase

Cytokinesis

Down's syndrome is case of .................. .

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Autosomy

Monosomy

Trisomy

Tetrasomy

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

Type of spindle fibre which attaches the chromosomes is called:

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Kinetochore

Non Kinetochore

Bot a and b

Centromere

Modern classification (binomial nomenclature) is based on the work of:

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Caesalpino

John Ray

Tournefort

Carolous Linnaeus

The phases of cell cycle are:

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Interphase

Division phase

Both a and b

None

Chiasmata is formed during:

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Prophase I

Anaphase I

Prophase II

Anaphase II

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

Phenomenon of crossing over in fruit fly was observed by:

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T.H. Morgan

W.Flemming

Oscar Hertwig

Louis pasteur

The prokaryotic cell division is termed as :

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Binary fission

Multiple fission

Cytokinesis

Karyokinesis

The kingdom of bacteria is:

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Fungi

Monera

Protista

Plantae

the Genetic variation are produced as a result of .............. .

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Meiosis

Mitosis

Interphase

None

Which of the following stage of cell division is very different for animal and plant cells?

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Telophase

Metaphase

Anaphase

Cytokinesis

How many cells die each day due to apoptosis in humans?

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50 - 70 Billions

50 - 70 Millions

50-70 trillions

20 - 30 Millions

The scientific name of human being is:

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Homo sapiens

Pisum sativum

Amanta

E. coli

Males with two Y chromosomes have more .................. tendensies.

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Citizenship

Criminal

Good

None

Which is not the function of mitosis?

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Development and growth

Cell replacement and regeneration

Asexual reproduction

Sexual reproduction

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

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Replication of DNA

Replication of centriol

Movement of centriol

Both a & b

Presence of third copy of homoglus chromosomes in the cell is called ........... .

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Monosomy

Disomy

Trisomy

Tetra somy

The chromosomes are arranged along the equator of spindle in:

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Prophase

Telophase

Anaphase

Metaphase

Which one is the lowest taxon of classification?

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Genus

Order

Species

Phylum

During mitosis the number of chromosomes becomes ............... .

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Double

Remain same

Becomes Half

None

The class of man is:

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Insecta

Mammalia

Magnoliopsida

Proteobacteria

The phase which can exist for life is:

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G₀

G₁

G₂

S phase

Mitosis help i the .................. .

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Growth

Regenration

Cell replacement

All of the above

Cytokineses in a plant cell is characterized by:

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The equal division of homologous chromosomes

A pinching off a cell membrane to divide the cell

The formation of a cell plate in the cytoplasm

The movement of the chromosomes from the metaphase plate

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

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Anaphase

Telophase

Metaphase

Prophase

The cell death due to tissue damage is:

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Apoptosis

Necrosis

Metastasis

Synapsis

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

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Meiosis

Mitosis

Interphase

None

The exchange of parts of non-sister chromatids is called:

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Chiasmata

Linkage

Crossing over

None of these

Chromatains are condensed during:

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Anaphase

Prophase

Anaphase

Metaphase

Uncoiling of chromosomes take place during:

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Anaphase

Telophase

Anaphase

Metaphase

Chromatids get separated form each other during:

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Prophase

Telophase

Anaphase

Metaphase

In this phase of Interphase the cell prepares proteins for the production of spindle fibres.

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G2 phase

G O phase

S phase

G I Phase

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

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Anaphase

Telophase

Metaphase

Prophase

Nucleus is visible only in:

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Prophase

Interphase

Anaphase

Metaphase

During S-phase ..................... occurs.

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DNA replication

Protein synthesis

RNA transcription

Enzyme synthesis

Chromosomes become double during:

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G₁

G₂

G₀

S phase

Specific enzymes are synthesized in:

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G₀

G₂

G₁

S phase

Chromosomes condensation occurs during .............. .

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G1-phase

G2-phase

S-phase

Interphase

In which stage of the cell cycle, the cell is preparing enzymes for chromosome duplication.

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G1

G2

S

M

Chromosomes are not visible during:

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Anaphase

Prophase

Interphase

Metaphase

The condensation of chromosomes is completed during:

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Telophase

Prophase

Anaphase

Metaphase

The process of mitaosis ensures that:

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Each new cell is genetically different form its parent

Each new cell receives the proper number of chromosomes

Cells which divide at the appropriate tme

Chromosomes replicate without errors

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

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22

12

21

14

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

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Split

Divide

Both

None

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

In which language, Ibn-Rushd translated the Aristotle's book "de Anima"?

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Ibrani

Arabic

Hindi

PErsian

In turner's syndrome female have ................. chromosomes .

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46

45

47

22

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

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GI

S

M

G2

The phenomenon of spread of tumor is called:

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Malignant

Benign

Metastasis

Mitosis

................ is similar to mitosis.

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Meiosis I

Meosis II

Interphase

G-phase

Who suggested the first system of classification of organisms?

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Al-Jahiz

Aristotle

John Ray

Averroes

Cells of which of the followings are called cancerois cells?

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Malignant tumer

Benign tumer

Both a and b

None of the above

In which stage of the cell cycle, the cell is preparing enzyme for chromosome replication?

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G1

G2

S

M