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Topics: DNA, Cell, Eukaryote Pages: 3 (288 words) Published: January 31, 2013
Questions on Units 1.1 – 1.4 on Cell Components 1 The figure below shows an electron micrograph of an animal cell.

A B

centriole C

nucleus

(a) Name and state the function of the following structures. (i) Structure A

…………………………………………………………………………………………… …………………………………………………………………………………………… (ii) Structure B

…………………………………………………………………………………………… …………………………………………………………………………………………… (iii) Structure C

…………………………………………………………………………………………… …………………………………………………………………………………………… (6 marks) (b) Describe the roles of centrioles in cellular division.

………………………………………………………………………………………………… …………………………………………………………………………………………………

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………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… (8 marks) (c) The nucleus is labelled on the diagram. Complete the table by putting a tick () or a cross () in each box to identify which properties belong to eukaryotic and prokaryotic cells. Structure or function Nucleolus Nuclear envelope Nucleoid Presence of DNA (4 marks) Eukaryotic cells Prokaryotic cells

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(d) The nucleus from the image is reproduced below. It has been magnified x 20,000

x 20,000

X

Y

Use the line XY as the length of the nucleus to work out its actual size. Show your working.

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