Steroid hormones do not need a:
a) carrier protein
b) receptor
c) target tissue
d) second messenger

Which sentence best expresses the differing opinions of these two book reviews?

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

What is the similarities and differences between bacteria and eukaryote?