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The active site of an enzyme is:

Look at the cartoon below, and explain why the slug family’s vacation will be a disaster. Use the word “hypertonic” in your answer.  

When physicians perform an organ transplant, they choose a donor whose tissues match those of the recipient as closely as possible. Which of these membrane components, important in cell recognition, is being matched?

On this diagram of a portion of a plasma membrane, the red objects are the _______ , the blue objects sticking out of the top are the _______ , the round purple objects are the _______ heads of the phospholipids, and attached to each of those are two _______ tails of the phospholipids. This whole model is called the _______ model of the plasma membrane. (Be sure to use correct spelling!) 

Small molecules such as fatty acids which can dissolve in lipids:

Which components of the cell membrane are responsible for actively carrying materials across the membrane?

You are told that the cells on a microscope slide are either plant, animal, or bacterial cells. You look at them and see cell walls and mitochondria. What can you conclude about the cells?

A plasma membrane surrounds:

The cell organelle responsible for processing and packaging materials is the:

The organelle that produces energy for the cell is the ___. (Your answer must be spelled correctly!)