Biomolecules: MCQs Quiz – 02 6


Biomolecules Questions: Online Multiple Choice Questions (MCQs) on Biomolecules – The Chemistry of Life, with answers and Test Reporting. Test No. 2

Biomolecules: MCQs Quiz - 02

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Question 1
Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component "X' in it
  Category Component
(1) Nucleotide Adenine
(2) Nucleoside Uracil
(3) Cholesterol Guanin
(4) Amino acid NH2
A
Option (1)
B
Option (2)
C
Option (3)
D
Option (4)
Question 2
Which one of the following is wrong statement?
A
Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins
B
Nitrosomonas and Nitrobacter are chemoautotrophs
C
Anabaena and Nostoc are capable of fixing nitrogen in free-living state also
D
Root nodule forming nitrogen fixers live as aerobes under free-living conditions
Question 3
Which one is the most abundant protein in the animal world?
A
Collagen
B
Insulin
C
Trypsin
D
Haemoglobin
Question 4
The catalytic efficiency of two different enzymes can be compared by the
A
Molecular size of the enzyme
B
The pH optimum value
C
The Km value
D
Formation of the product
Question 5
Which one of the following amino-acids was not found to be synthesized in Miller's experiment?
A
Glutamic acid
B
Aspartic acid
C
Glycine
D
Alanine
Question 6
Example of a typical homopolysaccharide is
A
Inulin
B
Suberin
C
Lignin
D
Starch
Question 7
Which of the following statements regarding enzyme inhibition is correct?
A
Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
B
Non-competitive inhibitors often bind to the enzyme irreversibly
C
Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
D
Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
Question 8
Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these
A
Are exclusively synthesized in the body of a living organism as at present
B
enhance oxidative metabolism
C
Are conjugated proteins
D
Help in regulating metabolism
Question 9
Carbohydrates, the most abundant biomolecules on earth, are produced by
A
Fungi, algae and green plants cells
B
All bacteria, fungi and algae
C
Some bacteria, algae and green plant cells
D
Viruses, fungi and bacteria
Question 10
The given graph shows the effect of substrate concentration on the rate of reaction of the enzyme green gram-phosphatase. What does the graph indicate?
A
The rate of enzyme reaction is directly proportional to the substrate concentration
B
Presence of an enzyme inhibitor in the reaction mixture
C
Formation of an enzyme-substrate complex
D
At higher substrate concentration the pH increases
Question 11
The figure given below shows three velocity-substrate concentration curves for an enzyme reaction. What do the curves a, b and c depict respectively?
A
a-normal enzyme reaction, b-competitive inhibition, c-non-competitive inhibition
B
a-enzyme with an allosteric modulator added, b-normal enzyme activity, c-competitive inhibition
C
a-enzyme with an allosteric stimulator, b-competitive inhibitor added, c-normal enzyme reaction
D
a-normal enzyme reaction, b-non-competitive inhibitor added, c-allosteric inhibitor added
Question 12
In which one of the following sets of three items each belong to the category mentioned against them?
A
Lysine, glycine, thiamine — Amino acids
B
Myosin, oxytocin and gastric — Hormones
C
Rennin, helicase and hyaluronidase — Enzymes
D
Optic nerve, oculomotor, vagus — Sensory nerves
Question 13

Assertion: Arachidic acid is an unsaturated fatty acid.

Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids.

A
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
C
Assertion is true, but Reason is false.
D
Both Assertion and Reason are false.
Question 14

Assertion:  A coenzymes  or  metal  ions  that  is  very  tightly  bound  to  enzyme  protein  is called prosthetic group.

Reason: A complete, catalytically active enzyme together with its bound prosthetic group is called apoenzyme.

A
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
C
Assertion is true, but Reason is false.
D
Both Assertion and Reason are false.
Question 15

Given below are two statements A and B. Choose the correct answer related to the statements.

Statement A - Amino acids are amphoteric in their function.

Statement B - All amino acids are necessary for our body.

A
Statement A is wrong, statement B is correct
B
Both the statements A and B are wrong
C
Statement A is correct, statement B is wrong
D
Both the statements A and B are correct
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