The base that is not found in DNA, but only in RNA is ________.  

Which of the following bonds is the weakest?  

Which method of bacterial DNA transfer involves a physical connection between the two bacterial cells?  

What is a plant organ?  

The long extension of a cell that can propel a cell forward by whipping back and forth (such as human sperm) is called a ________.  

What is the main purpose of cellular respiration?    

During which stage of cellular respiration is the majority of the ATP produced?  

  Is a virus considered alive?    

Which cellular structure is unique to prokaryotic organisms?  

Which of the following is the correct organizational hierarchy, from largest to smallest, in the hierarchical order of life? (Some levels have been omitted, so you are looking for the correct order.