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  Chemical reactions carried out by living systems depend on the ability of some organisms to capture and use atoms from nonliving sources in the environment. The specific subset of these reactions that break down nutrients in food can be described as  

  Drosophila melanogaster is a(n) __________. This type of animal is the most abundant of all animal species, making it an appropriate choice as an experimental model.  

  Some proteins have α helices, some have β sheets, and still others have a combination of both. What makes it possible for proteins to have these common structural elements?  

  The correct folding of proteins is necessary to maintain healthy cells and tissues. The presence of unfolded proteins is associated with some neurodegenerative disorders such as Alzheimer’s disease, Huntington’s disease, and Creutzfeldt–Jakob disease (the specific faulty protein is different for each disease). What happens to these disease-causing, unfolded proteins?  

  Triacyclglycerols are examples of  

  The pH of an aqueous solution is an indication of the concentration of available protons. However, you should not expect to find lone protons in solution; rather, the proton is added to a water molecule to form a(n) __________ ion.  

  Which of the following are methods for isolating a protein of interest?

A firm that produces toothpaste acquires another firm that produces toothbrushes. In order to increase profits, the firm should 

  What makes up the backbone of DNA?  

  The repair of mismatched base pairs or damaged nucleotides in a DNA strand requires a multistep process. Which choice below describes the known sequence of events in this process?