CAIE A-Level Biology AS 5 The Mitotic Cell Cycle Topic Practice

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Question 1

[Maximum number: 6]

The root apical meristem is a region of undifferentiated cells in the root tips of plants. Mitosis occurs in this region.

Question (a)

(a)

Fig. 1.1 is an image of the root tip of Allium as observed using a microscope with a low-power objective lens.

Fig. 1.1

Fig. 1.1

State which region, B, C, or D, should be chosen in order to observe the highest proportion of cells in stages of mitosis.

[ 1 ]

Question (b)

(b)

Draw a labelled diagram to show the structure of a chromosome at late prophase of mitosis.

[ 3 ]

Question (c)

(c)

Describe the behaviour of the nuclear envelope during mitosis.

[ 2 ]

Question 2

[Maximum number: 5]

During interphase of the cell cycle, individual chromosomes cannot be seen within the nucleus. The genetic material is termed chromatin during this stage.

Question (a)

(a)

Changes occur to chromatin during mitosis so that chromosomes become visible.

State what happens to chromatin so that individual chromosomes can be seen during mitosis.

[ 1 ]

Question (b)

(b)

Fig. 5.1 is a transmission electron micrograph of two human chromosomes at metaphase of mitosis.

magnification \(=\times 14000\)

magnification \(=\times 14000\)

Describe the structure of chromosomes at metaphase, such as the two chromosomes shown in Fig. 5.1.

[ 4 ]

Question 3

[Maximum number: 1]

Which diagrams show roles of mitosis?

1

1

4

4

3

3

A

1, 2, 3 and 4

B

1, 2 and 3 only

C

1 and 2 only

D

3 and 4 only

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