The quaternary structure of a protein:

(a) Consists of 4 subunits - hence the name quaternary

(b) Is unrelated to the function of the protein

(c) Both (a) and (b)

(d) Depends on the 1° structure of subunits

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Adult human haemoglobin consists of:

(a) 2 subunits (á, á)                            (b) 2 subunits (â, â)

(c) 4 subunits (2á, 2â)                       (d) 3 subunits (2á, 1â)

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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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