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5 Written questions

5 Matching questions

  1. Identify the 4 levels of protein structure.
  2. Distinguish between an ion and a polar molecule.
  3. Define electrolyte balance.
  4. What is the relationship between matter and elements?
  5. What is a buffer?
  1. a they are chemicals that resist pH change. They combine with hydrogen ions when these ions are in excess or they donate hydrogen ions when these ions are depleted.
  2. b Ions: atom or molecule with an electrical charge.
    Polar: molecule in which the electrons and protons are not distributed symmetrically.
  3. c The body regularly gains and loses these electrolytes, but they must be present in certain concentrations, both inside and outside cells, to maintain homeostasis.
  4. d All matter is composed of fundamental substances.
  5. e Primary, Secondary, Tertiary, Quaternary

5 Multiple choice questions

  1. The number of protons equals the number of electrons.
  2. Water
  3. Each electron shell can hold a limited # of electrons. The maximum number of electrons that each of the 1st three shells can hold for elements of atomic number 18 and under is ...1st shell ( close to the nucleus) 2 e-, second shell 8 e-, third shell 8 e-. More complex atoms may have as many as 18 e- in the 3rd shell.
  4. fats, phospholipids, and steroids.
  5. Hydrogen bonding is important to Tertiary & Secondary protein structures.

5 True/False questions

  1. Which elements are most common in the human body?DNA: molecules store the information for protein synthesis.
    RNA: molecules use this information to construct specific protein molecules.


  2. Compare the chemical composition of carbohydrates, lipids, proteins, and nucleic acid.Carbohydrates: C, H, O
    Lipids: C, H, O (often P)
    Protein: C, H, O, N, ( often S)
    Nucleic acids: C, H, O , N , P


  3. Compare the characteristics of an acid, a base & a salt.Acid: substance that releases hydrogen ion
    Base: substance that release ions that can combine with hydrogen ions
    Salt: substance formed by the reaction between and acid and a base.


  4. Explain why some atoms are chemically inert.Atoms whose outermost electron shells are filled already have stable structures and are chemically inactive.


  5. What is an isotope?Atoms that gain or lose electrons because electrically charge.


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