1. Fifteen tobacco plants of the same age and genetic strain were randomly assigned to 3 groups of 5 plants each. One group was untreated, one was infected with

tobacco mosaic virus (TMV), and one was infected with tobacco ringspot virus

(TRSV). After one week the activity of o-diphenol oxidase was determined in each

plant. Does infection by either virus affect the activity of this enzyme? Use the

Bonferroni-Holm test to separate means, if indicated. Below is a table of the Enzyme Activity inmg/ml protein/min.

Control	TMV-Infected	TRSV-Infected
1.47	2.44	2.87
1.62	2.31	3.05
1.06	1.98	2.36
0.89	2.76	3.21
1.67	2.39	3.00