Select the wrong statement:

(a) Cell growth is a continuous process

(b) Cytoplasmic content increase occurs only during one specific stage in the cell cycle

(c) DNA synthesis occurs only during one specific phase of cell cycle

(d) None of these

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Which one is correct for Go stage?
I. It is a quiescent stage
II. In this phase cell cycle is stopped
III. G0 cells in this stage do not grow or proliferate but metabolically active
IV. G0 cells can divide in response to some stimulus
(a) All are correct                          (b) I, II, III are correct
(c) I, II are correct                        (d) Only I and IV are correct

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Which of the following statements is false?
(a) Mitosis or the equational division is usually restricted to the 2N cells only
(b) In onion 2N = 16
(c) Growth and reproduction are characteristics of cells indeed of all living organism
(d) In plants meristematic tissues show meiosis

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At metaphase of mitosis, each chromosome consists of _______ chromatid(s) _______ centromere(s) ________ kinetochore(s) and _______ molecules of DNA:

(a) 2, 1, 2, 2         (b) 2, 2, 2, 2        (c) 2, 1, 1, 1                   (d) 2, 1, 2, 1

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In human cells chromosomes are:

(a) Always condensed during the entire cell cycle

(b) Different in different tissues

(c) Of the same size and shape

(d) Visible only during mitosis and meiosis

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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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