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5 Written Questions

5 Matching Questions

  1. Which elements are most common in the human body?
  2. Explain the difference between saturated & unsaturated fats.
  3. Distinguish between simple and complex carbohydrates.
  4. Compare the characteristics of an acid, a base & a salt.
  5. Explain how electrons are distributed within the electron shell of atoms.
  1. a Carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus.
  2. b 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.
  3. c Saturated: single carbon-carbon bond link all the carbon atoms; each carbon atom binds as many hydrogen atoms as possible & is thus saturated with hydrogen atoms.
    Unsaturated: have one or more double bond between carbon atoms. Fatty acids with one double bond.
  4. d Simple: sugars include monosaccharaides, disaccharides; straight chains or rings.
    Complex: polysaccharides are built of simple carbohydrates made of many bonded glucose molecules chains of sugars, cant digest.
  5. e 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.

5 Multiple Choice Questions

  1. All matter is composed of fundamental substances.
  2. Hydrogen bonding is important to Tertiary & Secondary protein structures.
  3. Atoms that have the same atomic number but different atomic weight.
  4. The body regularly gains and loses these electrolytes, but they must be present in certain concentrations, both inside and outside cells, to maintain homeostasis.
  5. Electrolyte: substance that ionizes in a water solution
    Nonelectrolyte: organic compounds that dissolve in water, usually do not release ions.

5 True/False Questions

  1. How does an enzymes affect a chemical reactions?Synthesis: when 2 or more atoms, ions, or molecules bond to form a more complex structure A+B->AB
    Decomposition: bonds of a reactant molecule break to form simpler molecules, atoms, or ions AB->A+B
    Exchange: parts of 2 different types of molecular trade positions as bonds are broken and new are formed AB + CD-> AD+ BC
    Reversible: product or products can change back to reactant or reactants A+B<-> AB

          

  2. What are the general difference between an organic molecule and an inorganic molecule?Organic: compounds have carbon and hydrogen.
    Inorganic: all other chemicals, chemicals that does not include both carbon and hydrogen atoms.

          

  3. Distinguish between a molecule and a compound.Ions: atom or molecule with an electrical charge.
    Polar: molecule in which the electrons and protons are not distributed symmetrically.

          

  4. Why is a knowledge of chemistry essential to understanding physiology?Molecular: consists of the symbols of the elements in the molecule with numerical subscripts that indicate how many atoms of each element are present.
    Structural: representation of the way atoms bond in a molecule.

          

  5. Explain why some atoms are chemically inert.Synthesis: when 2 or more atoms, ions, or molecules bond to form a more complex structure A+B->AB
    Decomposition: bonds of a reactant molecule break to form simpler molecules, atoms, or ions AB->A+B
    Exchange: parts of 2 different types of molecular trade positions as bonds are broken and new are formed AB + CD-> AD+ BC
    Reversible: product or products can change back to reactant or reactants A+B<-> AB

          

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