Refer to the table comparing the genomes of E.coli and S.cerevisiae. 
The most striking difference between yeasts and bacteria in their numbers of genes is in the category of _______ genes.
Definitions:
Metric System
A decimal system of measurement based on meters, liters, and grams as units of length, volume, and weight.
Liter
A metric unit of volume equal to one cubic decimeter or 1000 cubic centimeters, commonly used to measure liquids.
Volume
The amount of space that a substance or object occupies, or that is enclosed within a container.
Experiment
A scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
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