Monday, March 11, 2019

Biomolecules: Previous Year Questions Part 2


2013 MARCH
a.   Identify the compound (½)
b.   Name the bond produced when another biomolecule of the same category combines with this. (½)
c.    If a number of such molecules are bonded together, what will be the resultant molecule? (½)
2.     Observe the following representation and fill up the blanks appropriately. (1½)
3.     Observe the graph showing the activity of an enzyme influenced by pH.
a.   Name the possible enzyme involved in this reaction. (½)
b.   Mention any other factor which affects this enzyme activity that results a similar pattern of graph.  (½)
1.     Observe the graph and answer the following: (3)
a.   Find out the role of enzyme. (1)
b.   Mention any two factors that influence the activity of an enzyme and state their influence. (2)
2014 MARCH
1.     Name the chemical bonds formed between the following:
a.   Amino acids in a protein molecule. (½)
b.   Sugar and phosphate in nucleic acids. (½)
2.     Distinguish between cofactor and coenzyme with an example for each. (2)
1.     (a)  Why are proteins heteropolymers? (1)
(b)  Identify the protein from the given list of biomacromolecules and write its function. (Cellulose, Starch, Antibody, Inulin). (1)
(c)  Identify the type of protein structures of A & B. (1)
Symbolic representation of a functional enzyme is given.
a. Write one difference between a co-factor and an apoenzyme. (1)
b. Name the different types of co-factors. (1)
c. What is the co-factor for enzyme, Carboxypeptidase? (1)
2015 MARCH
1.     Identify the protein structures, (A) and (B) from the following figure.
G:\blue tooth\New Doc 13_2.jpg
2.     Analyse the graph showing the activity of an enzyme, influenced by temperature.
a.   What is meant by optimum temperature?
b.   Why does the enzyme activity decline at too low and too high temperature? (2)
1.     Complete the following sequence with appropriate words. (1)
Amino acids: ….. (a) … Proteins
….. (b)…..: Glycosidic bond: Polysaccharides
2.     Based on the graph given below, explain the effect of concentration of substrate on enzyme activity. (2)

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