A fundamental question to be answered as you begin your study of biology concerns the differences between living and nonliving things. Determining if something is living or nonliving can be very difficult. It is generally accepted that living things are made of one or more cells, all reproduce, grow and develop, obtain and use energy, and respond to the environment. In this lab, you will work with Bromothymol Blue, an indicator used to determine the presence of carbon dioxide. When living organisms convert their food to energy during respiration, they give off carbon dioxide as a waste product. You will be using yeast in this lab to observe the characteristics that indicate that they are living.
This is a fun lab where students will answer the question What characteristics of life can you observe that indicate yeast are living organisms? This zip file contains a pdf version, as well as a fully editable word doc.