Which picture illustrates the anaphase stage of mitosis?
a) picture a, where the spindle fibers start to pull away from the center of the cell.
b) picture b, where nuclear membranes form around each set of chromosomes resulting in two nuclei.
c) picture c, where each pair of sister chromatids attaches to a spindle fiber by its centromere.
d) picture d, where chromosomes coil up, nuclear membranes break down, and spindle fiber systems form.

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

Which of these is the best source of stem cells and minimizes the risk with cell transplantation