Some questions must be answered with a cross in a box . If you change your mind about an
answer, put a line through the box and then mark your new answer with a cross .
A number of different enzymes are involved in the synthesis of mRNA and
polypeptides.
The diagram below shows two steps involved in the synthesis of a polypeptide.
Place a cross in the box that completes the following statement.
An enzyme is
A a fibrous protein
B a globular protein
C a saturated fatty acid
D an unsaturated fatty acid