Water is most dense and thus heaviest at 4°C.  At 0°C, ice forms and the ice can float on liquid water.  Suppose ice were more dense than water at 0°C, what would happen in a lake at this temperature (hint: think of what would happen to our planet)?    

    According to most car mechanics, plain water is the best coolant to use in an engine (think why???) provided the engine is not being exposed to freezing temperatures.  If the car is subject to freezing temperatures then a mixture of water and ethylene glycol (antifreeze) is recommended but it does not cool as efficiently as plain water.  Why would ethylene glycol reduce the cooling efficiency of water?    

  Most living things have remarkably similar levels/percentages of the core elements essential to life.  In a chemical analysis of an animal tissue sample, which element (of the four below) would be in the least quantity?   

  The “Central Dogma of Life” (dogma = an overriding principle) describes how DNA instructs (or codes) for what final product?  

  Biology is the study of __________.   (pick the best answer… talked about on the first day of class)  

  Match the monomer to the appropriate macromolecule.  

  You make the observation that walnut and Gingko trees lose their leaves in the fall when day length starts decreasing.  Based on these observations, one may generalize and conclude that ALL tree species will lose their leaves in the fall in response to decreasing day length.  This statement is an example of….   

  Which statement about unsaturated fats is TRUE?  

  Think about the phospholipid bilayer of a cell membrane…   Which of the following types of molecules will diffuse through a cell membrane most readily (= have the easiest time passing thru)?  

  Match the cell component/organelle to its function/description.