The theory of force generation proposed (microfilaments can generate force, even in the absence of myosin, by elongating and pushing against a structure such as the plasma membrane) (also cytochalasins inhibit microfilament growth)is best supported by which of the following observations about amoeba locomotion? a. amoeboid movement stops upon expose to cytochalasins. b. amoeboid movement cannot occur if mitosis is blocked. c. moving amoeba cells produce more troponin than do stationary ones. d. the rate of movement is inversely proportional to the viscosity of the medium in the amoeba moves.

Experiment scenario 2: a biology student wants to conduct a study of how the amount of food affects the weight gain for mice. i have set up four cages with a mouse in each cage. fill in the boxes that would allow the biology student to complete the study correctly

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".