In prophase mitosis, which one of the following events occurs in animal cells but not in plant cells?

(a) Centrioles migrate to opposite sides of the nucleus

(b) Homologous chromosomes do not associate

(c) The nuclear envelope (membrane) breaks down

(d) Nucleoli disappear

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Synaptonemal complex is more conspicious at:

(a) Zygotene         (b) Pachytene       (c) Diplotene         (d) Leptotene

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Centrosomes are:

(a) Constricted regions of chromosomes

(b) Regions where microtubules polymerise

(c) Part of Cilia

(d) The central part of the same cell

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Cellular structures which disappear during late prophase and reappear during telophase are:

(a) Mitochondria and spindle fibres    (b) Plasma membrane

(c) Nuclear membrane and nucleolus  (d) Plastid

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A picture of dividing Drosophila cell through a microscope shows that the cell contains 8 chromosomes, each consisting of two chromatids. The picture must have been taken during:

(a) Mitotic metaphase                        (b) Mitotic Anaphase

(c) Meiotic Anaphase II                      (d) Meiotic Telophase II

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Given:
1. Chromatid                                    2. Monad
3. Dyad                                            4. Daughter chromosome
The correct sequence in cell division is:
(a) 1, 2, 3, 4               (b) 2, 3, 1, 4              (c) 3, 2, 1, 4              (d) 4, 3, 2, 1

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Cytokinesis in animal cell takes place by _______; in _______ direction while in plant cell by _______; in _______ direction:

(a) Furrowing, centrifugal, cell plate, centripetal

(b) Furrowing, centripetal, cell plate, Centrifugal

(c) Cell plate, centrifugal, furrowing, centripetal

(d) Cell plate, centripetal, furrowing, centrifugal

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Liquid endosperm in coconut is resulted due to:

(a) Karyokinesis followed by cytokinesis

(b) Failure of karyokinesis followed by cytokinesis

(c) Karyokinesis twice followed by single cytokinesis

(d) Karyokinesis is not followed by cytokinesis

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The above graph shows the change in DNA content during various phases (A to (d) in a typical mitotic cell cycle. Identify the phases:

 

A

B

C

D

(a)

G2

G1

S

M

(b)

G

S

G2

M

(c)

G1

S

G2

M

(d)

M

G1

S

G2

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Label the structure indicated by lines (i), (ii), (iii) and (iv):

(a) (i) - Chromatid, (ii) Centriole, (iii) Centromere, (iv) Chromosome

(b) (i) - Chromomosome, (ii) Centriole, (iii) Centromere, (iv) Chromatid

(c) (i) - Chromatid, (ii) Centromere, (iii) Centriole, (iv) Chromosome

(d) (i) - Chromomosome, (ii) Centromere, (iii) Centriole, (iv) Chromatid

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