140. Which of the following molecules are never found as polymers? (1) Carbohydrates (2) Lipids (3) Nucleic Acids (4) Proteins 141. Consider the following statements. I. Solid stem in wheat exhibits non-preference by stem sawfly. II. In cotton, smooth leaf and absence of nectar do not attract bollworms. III. In maize, high aspartic acid, low nitrogen and sugar content protect them from stem borers. Which of the statements given above are correct? (1) I, II and III (3) I and III (2) I and II (4) II and III 142. The 'R' group in proteinaceous amino acids could not be :- (1) Hydrogen (2) Methyl (3) Hydroxy methyl (4) Oxygen 143. If recombinant DNA is inserted within the coding sequence of enzyme galactosidase, which of the following will occur in case of non-recombinants:- (1) Insertional inactivation (2) Colonies do not produce any colour (3) Chromogenic substrate gives blue colour (4) Inactivation of enzyme galactosidase