Sea urchins are preyed about by many predators that inhabit their marine environment, but also those animals that don't. The main predators of the sea urchin are crabs, large fish, sea otters, eels, birds and humans.
Interphase is the phase during which the growth of the cells take place along with the metabolic activity but the nuclear division in the cell does not occur. The three stages included within the interphase are the G1, S and G2.
Red blood cells contain the oxygen-carrier protein hemoglobin. It is composed of four globular peptides, each containing a heme complex. In the center of each heme, lies iron (Figure 10.6). Iron is a key component of hundreds of metabolic enzymes.Many of the proteins of the electron-transport chain contain ironâsulfur clusters involved in the transfer of high-energy electrons and ultimately ATP synthesis.ron is a key component of hundreds of metabolic enzymes. Many of the proteins of the electron-transport chain contain ironâsulfur clusters involved in the transfer of high-energy electrons and ultimately ATP synthesis.