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94' SBIOA Exam

 

93 Exam 
Part A: M/C
Part B: Short Answers
Part C: Essay Question

94 Exam 
Part A: M/C
Part B: Essay Questions

95 Exam 
Part A: M/C
Part B:
Part C:
Part D:

97 Exam 
Part A: M/C
Part B:
Part C:
Part D:
  

 

  

 

Part A: Multiple Choices

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  1.     The number of electrons that an atom must acquire, lose, or share, to reach a stable outer configuration is called its

 

            a.         *correct*combining capacity (valence).

            b.         electronegativity.

            c.         bond energy.

            d.         isotope.

            e.         mass number.

 

2.      All the atoms of a given element contain, within their nuclei, the same number of

 

            a.         protons and neutrons.

            b.         neutrons.

            c.         electrons and neutrons. 

            d.         *correct* protons. 

            e.         electrons and protons.

 

3.      Atoms of a single element which have a different number of neutrons in the nucleus are  called

 

            a.         *correct*isotopes.

            b.         ions.

            c.         electronegative atoms.

            d.         electropositive atoms.

            e.         isomers.

 

4.      In which of the following functional groups would you find a hydrogen atom bonded to a nitrogen atom?

 

            a.         carboxyl

            b.         *correct* amino

            c.         carbonyl

            d.         hydroxyl

            e.         sulfhydryl

 

5.        Some of the following might be characteristics of an acid.

                I. It is a proton donor.

                 II. It is a proton acceptor.

                 III. It reacts with a base to produce a salt.

                 IV. It consists of a solution of hydronium ions and ions of a non‑metal.

                 V. It can participate in a neutralization reaction    to produce a base.

            Which of the following groupings is correct?

 

            a.           I, III, and V

            b.         *correct*  I, III, and IV

            c.           II, III, and IV

            d.           III, IV, and V

            e.           II, IV, and V

 

 

6.          Buffers in living organisms

 

            a.         maintain cytoplasm in a fluid condition.

            b.         *correct*maintain pH in the cells within a narrow range, allowing enzymes to function efficiently.

            c.         allow the pH of cells to change without affecting the action of the enzymes.

            d.         neutralize the effect of enzymes.

            e.         prevent charged particles from entering the cells.

 

7.          What type of chemical reaction is illustrated by the following reaction?

 

                        C6H12O6 + 6H2O + 6O2 ‑‑‑‑> 12H2O + 6CO2

 

            a.         hydrolysis

            b.         substitution

            c.         *correct*oxidation‑reduction

            d.         neutralization

            e.         dehydration synthesis (condensation)

 

8.          A transfer of electrons from one atom to another results in a bond which is

 

            a.         covalent.

            b.         a peptide.

            c.         polyvalent.

            d.         isotopic.

            e.         *correct* ionic.

 

9.      The C‑H bond is a very important chemical bond, present in many biochemical molecules.  The bond could be described as:

 

            a.         a strong ionic bond.

            b.         a hydrogen bond.

            c.         *correct*a covalent bond.

            d.         a weak ionic bond.

            e.         both ionic and covalent.

 

10.        Which of the following is NOT a polymer?

 

            a.         protein

            b.         *correct* fat

            c.         RNA

            d.         starch

            e.         cellulose

 

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