BSC 2010 (Ellington) Practice Exam1
1. Isotopes of the same element always have: (A) different number of electrons, (B)
same number of protons, (C) same number of neutrons, (D) different number of
protons or (E) none of the above.
2. Carbon as has atomic number of 6. How many electrons will be in its outer
electron shell? (A) 6, (B) 1, (C) 2, (D) 5 or (E) 4.
3. An isotope of carbon has an atomic mass number of 13. How many neutrons does
it have in its nucleus (use info from question #2)? (A) 13, (B) 12 , (c) 7, (D) 6 or
(E) none of the above.
4. An electron residing in which of the following orbitals would have the highest
energy level? (A) 4p, ((B) 1s, (C) 3s, (D) 2p or (E) 3p.
5. A polar covalent bond is formed when ______ . (A) two ions bind, (B) two very
electronegative atoms form a bond, (C) two very electropositive atoms form a
bond, (D) a very electropositive atom and a very electronegative atom form a
bond, or (E) all of the above.
6. Substances are able to dissolve in water because they form _____ bonds with the
water molecules.- (A) polar covalent, (B) non-polar covalent, (C) hydrophobic,
(D) all of the above, or (E) none of the above.
7. When the pH of a solution goes from 7 to 11 we know that_____ . (A) the
solution is now more basic, (B) [H+] has decreased, (C) [OH-] has increased, (D)
all of the above, or (E) none of the above.
8. The concentration of protons ([H+]) in a pH 2 solution is ______. (A) 2 M, (B)
0.02 M, (C) 0.01 M, (D) 0.1 M or (E) 0.001 M.
9. The simple sugar glucose has a gram formula weight of around 180 g. If you
wanted to make one liter (L) of a 10 mM solution you would have to weigh out
how many grams of glucose? (A) 360 g , (B) 1.8 g, (C) 180 g (D) 1,800 g, or (E)
90 g.
10. A pH 7 solution is _____________ concentrated in terms of H+ than a pH 11
solution.- (A) 100 times more, (B) 10,000 times more, (C) 5,000 times more, (D)
10,000 times less or (E) 1,000 times less.
11. The functional group (-OH) is called a ________________ . (A) sulfhydryl, (B)
ketone, (C) aldehyde, (D) hydroxyl, or (E) amino.
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12. A 75 mM solution is ___________ concentrated than a 7.5 M solution. (A) 100
times less, (B) 10 times more, (C) 100 times more, (D) 75 times more, or (E)
1,000 times less.
13. Helium is INERT because _______ . (A) it is light, (B) it has a small number of
protons, (C) it has many unpaired electrons in its outer shell, (D) it has one
unpaired electron, or (E) it has no unpaired electrons in the outer shell.
14. Which of the following is NOT true of hydrogen bonds? (A) are very weak, (B)
are broken by decreased temperature, (C) are broken by increased temperature,
(D) are important in the solvent properties of water, (E) none of the above.
15. An anion will ALWAYS have __________. (A) more electron(s) than protons,
(B) more protons than electrons, (C) more neutrons than protons, (D) equal
number of electrons and protons, or (E) equal number of protons and neutrons.
16. Geometric isomers of an organic compound _______________. (A) have
different numbers of carbon atoms, (B) differ in covalent relationships of atoms,
(C) are mirror images of each other, (D) have the same covalent relationships of
atoms but differ in spatial arrangements around a double bond, or (E) differ in
neutron numbers.
17. The major role of carbohydrates in animals is (A) energy storage, (B) insulation,
(C) cushion, (D) all of the above or (E) none of the above.
18. The compound depicted below is a(n) _________. (A) phospholipid, (B) amino
acid, (C) monoglyceride, (D) monosaccharide, or (E) none of the above.
19. The breakdown of protein from a polymer to its constituent subunits ______. (A)
is a hydrolysis reaction, (B) consumes water, (C) releases amino acids, (D) all of
the above or (E) none of the above.
20. Butter (a lipid) is solid at room temperature because _____________. (A) it has
few double bonds in its fatty acids, (B) it has many double bonds in its fatty acids,
(C) it is highly unsaturated, (D) it becomes liquid at low temperatures or (E) none
of the above.
21. A micelle consists of _______. (A) neutral fats, (B) amino acids, (C) glycerol, (D)
glucose or (E) phospholipids.
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22. A basic amino acid will have _________. (A) net negative charge, (B) no charge,
(C) net positive charge, (D) equal balance of negative and positive charges at all
pH values or (E) none of the above.
23. Peptide bonds stabilize the ____________ structure of proteins. (A) secondary
and tertiary, (B) tertiary, (C) quaternary, (D) primary and quaternary or (E)
primary.
24. A good example of an amphipathic molecule is a (n) ____________. (A) neutral
fat,(B) monosaccharide, (C) phospholipid, (D) amino acid or (E) none of the
above.
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