What are motor proteins? give 2 examples and describe how they contribute to: 1) directed movement of vesicles in protein transport 2) muscle contraction of skeletal muscle

If cells in the process of dividing are subjected to colchicines, a drug that interferes with the functioning of the spindle fibers, at which stage will mitosis be arrested?

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.