Thank you for using the Jiskha Homework Help Forum. It would be helpful if you could state exactly what part of biology you are studying. Just the word "biology" is too broad. Here are some tutorials:
2. (Part II of #1): http://www.biology-online.org/1/1_cell.htm
NOTE: Some textbooks have online help, so if you would give us the name and author of your textbook, we may find something helpful for you.