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INTRODUCTION TO CELLULAR BIOCHEMISTRY EXAM QUESTIONS AND ANSWERS
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INTRODUCTION TO CELLULAR BIOCHEMISTRY EXAM QUESTIONS AND ANSWERS....
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How do environmental factors affect cells? - ANSWER they affect thestructure and function of biological macromolecules
What are the 6 environmental factors that affect the cell? - ANSWER 1. pH
2. Temperature
3. light (energy)
4. salinity
5. solutes (ions, gases, sugars)
6. denaturing agents and detergents
How does pH affect the cell? - ANSWER pH differences can cause the
unfolding of proteins due to the amount of hydrogen ions present that can
interact with bonds and disrupt the structure of the molecule
Which bonds are most affected by pH? - ANSWER hydrogen and ionic bonds
are the most sensitive due to the charge nature of pH
How does temperature affect the cell? - ANSWER it denatures proteins by
breaking noncovalent bonds, as well as causing slow movement at low
temperatures
Which bonds are most affected by temperature? - ANSWER noncovalent (
hydrogen bonds) and ionic bonds at extremely high temperatures
how does light energy affect the cell? - ANSWER UV light breaks covalent
bonds
how does salinity affect the cell? - ANSWER can cause water to leave DNA
and other important parts of the cell via osmosis as well as interacting with
intermolecular interactions and affecting intramolecular forces that allow
molecules to fold properly
How does a high salt concentration affect the cell? - ANSWER The salt
disrupts the positive and negative charges, hindering molecule interaction
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