On an electrophoresis gel, band b is closer to the positive end of the gel than is band a. which of the following statements is true?
a. band b is more negatively charged than band a.
b. band b moved faster than band a.
c. band a is smaller than band b.
d. band b consists of larger dna fragments than does band a.

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist