E. coli is a “facultative anaerobe”, meaning without oxygen it cannot do cellular respiration.

Which of the following is associated with the second line of defense? 

Vaccines trigger ________________.

Most of the process of cellular respiration takes place within the mitochondria. 

Which of the following is a type of vaccine? 

In the human body, cartilage is found in _________.

The difference between simple diffusion and active transport is that simple diffusion requires ______________ and active transport requires __________________. 

How are some bacteria able to be metabolically active in hot springs that most organisms cannot withstand? 

Fertilization occurs within _______________. 

Compare and contrast the first and third lines of defense.  List two components of each line of defense.