1.  Insulin is protein

2.  All enzymes are proteins

4.  Elastin is a protein

2.  r-RNA

3.  m-RNA

4.  s-RNA

2.  A-terminal end

3.  C-terminal end

4.  F-terminal end

1.  Viruses only

2.  Bacteria only

3.  Plants and animals only

1.  Solutions

3.  Mixtures

4.  Any of these

1.  Specific temperature

2.  Specific pH

4.  Neither (A) nor (B)

1.  Simple carbohydrates

2.  Aldehydes

4.  Ketones

1.  Holenzymes

2.  Endoenzymes

4.  Coenzymes

1.  Hemoglobin is present in muscles while myoglobin is present in blood

2.  Hemoglobin transports oxygen while myoglobin transports carbon dioxide

4.  Both Hemoglobin and myoglobin transport carbon dioxide

1.  Many substrates

2.  Single substrate

3.  A group of closely related substrates