Lecithin is:

(a) Phospholipid    (b) Carbohydrate   (c) Protein             (d) Amino acid

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Which one is false?
(a) Fatty acids may be unsaturated (with one or more C = C bonds) or a saturated (without double bonds)
(b) Fatty acid(s) may be esterified with glycerol forming monoglyceride, diglyceride and then triglyceride
(c) Sometimes especially neural tissues have lipid very simple structures
(d) Fats and oils are triglycerides

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The above diagram represent the nitrogenous bases. Identify the correct combination:

(a) A = Adenine; B = Thymine           (b) A = Guanine; B = Thymine

(c) A = Adenine; B = Uracil                (d) A = Guanine; B = Uracil

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Which one of the following is the diagrammatic representation of a nucleotide?

(a)  (b)       (c)     (d)

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Adenosine, Guanosine, thymidine, uridine, cytidine are all ________ but adenylic acid, guanylic acid, uridylic acid, cytidylic acid are ______:

(a) Nucleotides, nucleosides               (b) Nucleosides, nucleotides

(c) Nucleotides, nucleic acids             (d) Nucleotides, nucleases

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Go through the following statements-
A. Primary metabolites are biochemicals formed as intermediates and products of normal vital metabolic pathways of organisms
B. Plant tissues produce only secondary metabolites
C. Secondary metabolites have restricted distribution in the plant kingdoms only.
D. Secondary metabolites are derivatives of primary metabolites.
E. Many plants, fungi and microbes synthesise secondary metabolites.
F. No secondary metabolite has ecological importance.
G. We understand the role of all secondary metabolites in the host organisms.
H. Many secondary metabolites are of economic importance to us.
Which of the above statement are wrong?
(a) A, B, C are wrong                                (b) D, E, F are wrong
(c) A, D, E are wrong                                (d) B, C, F, G are wrong

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Which one of the following is not a polymeric substance?

(a) Rubber             (b) Morphine                   (c) Gum                (d) Cellulose

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Which one is heteropolymer?

(a) Chitin

(b) Polyethylene

(c) Peptidoglycan

(d) Inulin

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Which one is correct?
(a) Inorganic catalysts work efficiently at high temperature and high pressure while enzymes get damaged at high temperature (above 40°C)
(b) Thermophilic organisms living in hot vents and sulphur springs have enzymes that are stable and retain their catalytic power even at high temperature (80 - 90°C)
(c) Ribozymes are nucleic acids behaving like enzyme
(d) All are correct

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Which of the following statements about enzymes is true?

  1. Enzymes do not alter the overall change in free energy for a reaction
  2. Enzymes are proteins whose three dimensional shape is key to their functions
  3. Enzymes speed up reactions by lowering activation energy
  4. Enzyme are highly specific for reactions
  5. An enzyme like any protein has the secondary and tertiary structure.
  6. The energy input needed to start a chemical reaction is called activation energy

(a) All are correct  (b) All except 5      (c) 5 and 6          (d) 2 and 4

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