1.) Which of the following statements about hydrogen bonds is FALSE?

       A. Hydrogen bonds create molecules.

 

       B. Hydrogen bonds make biological molecules more stable.

 

       C. Hydrogen bonds are weak interactions.

 

       D. In DNA, hydrogen bonds between nitrogen bonds make the structure more stable.

 

 

2.) The following describes the quaternary structure of a protein.

      A. Quaternary structures have only the alfa helixes.

 

      B. Quaternary structures are made due to hydrogen bonds.

 

       C. Quaternary structures are made of multiple polypeptides bound to each other using noncovalent interactions.

 

    D.   Quaternary structures are rarely observed in nature.

 

 

3.) The following describes the primary structure of a protein.

      A. Protein’s primary structure is the functional form of the protein.

 

      B. Protein’s primary structure is known as polypeptide, which is a chain of amino acids.

 

      C.  In its primary structure, protein is organized into domains.

 

      D. Protein’s primary structure is known as globular protein.

 

 

4.) Which of the following statements about an enzyme is TRUE?

       A. Enzymes decrease the speed of a chemical reaction.

 

      B.  Enzymes are not used up in a chemical reaction.

 

       C. Enzymes alter the thermodynamics of a reaction.

 

      D.  Enzyme kinetics is the 3^rd order rate reaction.

 

 

5.) Which of the following statements about an enzyme is FALSE?

      A.  Enzymes increase the speed of a chemical reaction.

 

       B. Enzymes are not used up in a chemical reaction.

 

       C. Formation of transition states reduces the product formation.

 

     D. Enzymes serve as points of regulation of metabolic pathways

 

 

6.) Which of the following statements about random mechanism is TRUE?

     A.  Random mechanism is a mechanism of enzyme inhibition.

 

    B.   In random mechanism, there is no order in which substrates can bind and form products.

 

    C.  Random mechanism is a measure of how fast products are formed.

 

    D.   In random mechanism, first the substrate binds to the enzyme, then forms a product, and modifies the enzyme.

 

 

 7.) Which of the following statements about ping-pong mechanism is TRUE?

     A.  Ping-pong mechanism is a mechanism of enzyme inhibition.

 

     B.  In ping-pong mechanism, first the substrate binds to the enzyme, then forms a product, and modifies the enzyme.

 

     C.  In ping-pong mechanism, there is no order in which substrates can bind and form products.

 

     D.  Ping-pong mechanism is a measure of how fast products are formed.

 

 

8.) Which of the following statements about glycogen is TRUE?

     A.  Glycogen is a storage polymer found in animal cells.

 

    B.   Glycogen is a branched polymer.

 

    C.   Glycogen is a polymer of alfa (1-4) linked glucose with alfa (1-6) branching.

 

    D.   All of the above

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