The answer is D.
Picture it like PAC-man
. The enzyme is pac-man and its hungry for a substrate. It's mouth is the active site. The substrates are cherries.
Answer:

Explanation:
Proteins are found inside the cell. There are proteins in the cell membrane and cytoskeleton, they act as enzymes inside the cell, and they are created inside the cell during protein synthesis at the ribosome.
Since proteins are part of the cell and are made inside the cell, the <u>proteins</u> must be smaller.
Pluto
Nasa's New Horizons mission made a close pass of Pluto this week. For more than 70 years, Pluto was one of nine planets recognised in our Solar System. But in 2006, it was relegated to the status of dwarf planet by the International Astronomical Union (IAU)