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IB Cell Cycle Practice BIOLOGY :KLFKRIWKHIROORZLQJLVDPHWDEROLFDFWLYLW\RIVRPHSURNDU\RWLFFHOOVEXWQRHXNDU\RWLFFHOOV"
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1. During
phase of the cell cycle do chromosomes duplicate? (HL p1 May09 TZ1 q6)
A. G1
B. S
C. G2
D. Mitosis
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2. Which statement best describes a role of mitosis?
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A. It 3KRWRV\QWKHVLV
increases genetic variation.
B. It facilitates growth of unicellular organisms.
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C.
It 1LWURJHQ¿[DWLRQ
facilitates reproduction of some unicellular organisms.
D. It repairs damaged cells.
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3.
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Which
of the following are functions of mitosis?
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(HL p1 May 2006 TZ1 q4)
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Respiration
(HL p1 May 2005 TZ2 q2)
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Which of the following processes take place during interphase?
(HL May p1 2003 TZ1 q6)
II. Active transport
III. Protein synthesis
IV. Replication of DNA
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A.%
I only
B. I and II only
C. I, II and III only
D. I, II, III and IV
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' plate
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5. If a cell
is beginning to form and nuclei are re-forming at opposite ends of a cell, what kind of cell is
(HL p1 2006 TZ2 q1)
this?
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A. An animal cell in prophase
B.
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A plant cell in prophase
C. An animal cell in telophase
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$A plant
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D.
cell in telophase
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6. What ensures that mitosis produces two genetically identical nuclei?
(HL p1 May 2008 TZ2 q3)
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% A.
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of each of the twenty-three types of chromosome is pulled to each pole of the cell by spindle
microtubules.
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& B.
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of the chromosomes are pulled to each centriole by mesosomes.
C. Identical chromatids are pulled to opposite poles by spindle microtubules.
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DNA molecules are moved to the equator of the cell where they are replicated.
7.
(a) Before cell division in unicellular and multicellular organisms, the nucleus must divide to produce two
genetically identical nuclei. Explain the events that occur in cells that result in the production of genetically
identical nuclei.
[8]
(SL p2 May07 TZ1 q5a&c)
(b) Suggest why cell division is necessary in multicellular organisms.
[4]
KEY
1. B
2. C
3. C
4. D
5. D
6. C
7 (a)
mitosis;
DNA replication;
each chromosome consists of two sister / identical chromatids;
chromosomes condense / supercoiling;
nuclear membrane breaks down;
chromosomes align (at equatorial plate);
spindle fibres / microtubules attach to centromeres of chromosomes on opposite sides;
centromeres split;
chromatids become chromosomes;
sister / identical chromosomes pulled to opposite poles;
nuclear membranes reform;
events correctly assigned to interphase, prophase, metaphase, anaphase, and telophase;
N.B.: A correct sequence of idea should be recognized when awarding the quality mark for structure of the
answer (linked ideas).
(b) more cells needed for growth;
repair / replacement;
cells specialize/differentiate for particular functions;
formation of reproductive cells (meiosis);
cells have to divide when they reach a certain size;
surface area to volume ratio becomes too small;
materials/oxygen/named material cannot be absorbed quickly enough;
rate of use of materials related to volume but rate of exchange related to SA;