Basi Molecule of Cells

In: Science

Submitted By THAM98
Words 536
Pages 3
MAY 2016
(Source: Final Examination, Apr 2015)
Q1. (a)
Figure 1.1 shows structures of some functional groups present in biological molecules Figure 1.1
Based on Figure 1.1, answer the following questions.

Identify the functional groups represented by C, D and E respectively.
(3 marks)


Given two carbohydrates molecules I and II, where by carbohydrate I contains chemical group A and carbohydrate II contains chemical group B, state ONE (1) possible carbohydrate for each carbohydrate molecule I and II.
(2 marks)


Briefly explain how functional groups may affect the functions of biological molecules.
(2 marks)


(Source: Final examination, April 2014)
Figure 2.1 shows two reversible processes of the synthesis of one disaccharide molecule and the formation of its monomers.


Figure 2.1

Name the type of disaccharide formed from process Y.

(1 mark)


Name the processes X and Y.

(2 marks)


State TWO (2) polysaccharides that can be found in plants formed by the monomers shown in Figure 2.1. Give ONE (1) function for each.
(4 marks)

(Source: Final examination, Sept 2013)
Figure 2.2 shows the molecular structure of lactose (a disaccharide).

Figure 2.2

Lactose can be broken down into its monomers by addition of water.
Based on Figure 2.2, draw the molecular structure of the monomers.
(2 marks)


Name TWO (2) monomers referring above (i).


(2 marks)


Figure 2.3 shows three different types of polysaccharides, B, C and D.

D grains in chloroplast B granules in

C microfibril in

liver cell

cell wall

Figure 2.3
Based on Figure 2.3, answer the following questions.

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