What is the velocity of a helicase that moves one base in each cycle if the helicase hydrolyzes 50 ATP per second? 6.8 x 10-3 um/s 1.7 x 10-4 um/s 1.7 x 10-2 um/s 6.8 x 10-6 um/s 6.8 x 10-2 um/s ООО QUESTION 140 the average distance between tumbles ООООО When a bacteria is moving toward a chemoattractant; decreases chemorepellent; does not change chemoattractant; increases chemoattractant; does not change chemorepellent; decreases