Friday, March 8, 2019

Biomolecules | Class 11 | Previous Year Questions - 2010 to 2014

BIOMOLECULES


2010 MARCH

1. Observe the graph:


    a. What is meant by Vmax value?
    b. Why Vmax not exceeded by any further rise in the substrate concentration?
    c. If a chemical substance closely resembling to that of a substrate is introduced into the reaction system, what will be the consequences? Substantiate.

2010 SEPTEMBER (IMPROVEMENT)

1. Fill in the blanks marked as a, b, c and d. (2)

Base

Nucleoside

Nucleotide

Adenine

Adenosine

Adenylic acid

Guanine

a

Guanylic acid

b

Cytidine

Cytidylic acid

Thymine

c

d


2. Find the odd one from each group. Justify your answer. (1)

a. Glutamic acid, Lysine, Valine, Collagen

2011 MARCH

1.   Non-protein constituents called cofactors are bound to the enzyme to make the enzyme catalytically active.
a.   Name the protein portion of the enzyme. (½)
b.   What happens to the catalytic activity when the cofactor is removed from the enzyme? (½)
c.    Mention any two kinds of cofactors with examples. (2)

2011 OCTOBER (IMPROVEMENT)

1.     Observe the following diagrams and answer the questions.

A

B

C
                  
D
                      
a.   Identify A to D (2)
b.   Name the compound obtained by the fusion of one ‘C’ and three ‘D’. (1)

2012 MARCH

1.     Observe the molecule given below and answer the following questions.


a.   Identify the molecule (½)
b.   Label 1 and 2. (1)
c.    Mention any three structural details of the molecule shown in the diagram. (1½)

2012 SEPTEMBER (IMPROVEMENT)

1.     Fill in the blanks:
Carbohydrate: sugars                 Proteins: --------------- (1)
2.     Analyze the graph showing the activity of salivary amylase.


a.   Which is the optimum temperature for salivary amylase obtained from the graph? (½)
b.   Why the activity declines below the optimum value? (½)

2013 MARCH

1.

    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)

2013 OCTOBER (IMPROVEMENT)

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)

2014 AUGUST (IMPROVEMENT)

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)



OR

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)

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