Practice Questions – Exam # 1 (mainly from lecture and lab)

1-5. Matching

A)

Non-polar Covalent bond

electrons are shared equally

1) _____

B)

Polar Covalent bond

electrons are not shared equally

2) _____

C)

Hydrogen bonds

one atom loses one or more electrons

3) _____

D)

Ionic bonds

attraction with a hydrogen ion and negative charge

4) _____

E)

 

 

5) _____

 

6-10. Matching

A)

Acid

increases pH

6) _____

B)

Base

increases [H+]

7) _____

C)

Salt

a solute that dissociates and releases H+

8) _____

D)

 

a solute that dissociates and releases OH-

9) _____

E)

 

compound created by reaction of an acid and a base

10) _____

 

11-15. Matching

A)

Cations

H+

11) _____

B)

Anions

Cl-

12) _____

C)

 

Na+

13) _____

D)

 

Ca2+

14) _____

E)

 

HCO3-

15) _____

 

16-20. Matching

A)

NaCl

sodium chloride

16) _____

B)

KCl

calcium chloride

17) _____

C)

CaCl2

potassium chloride

18) _____

D)

NaHCO3

sodium bicarbonate

19) _____

E)

Na2HPO4

disodium phosphate

20) _____

 

21-25. Matching

A)

pH 5

0.0000000398 M [H+]

21) _____

B)

pH 6

0.00000001 M [H+]

22) _____

C)

pH 7

0.0000001 M [H+]

23) _____

D)

pH 7.4

0 000001 M [H+]

24) _____

E)

pH 8

0.00001 M [H+]

25) _____

 

26-30. Matching

A)

bicarbonate buffer

NaOH + H2CO3 ¾® NaHCO3 + H2O

26) _____

B)

phosphate buffer

NaHCO3 + HCl ¾® NaCl + H2CO3

27) _____

C)

 

OH- + H2PO4- ¾® H20 + HPO42-

28) _____

D)

 

H+ + HPO42- ¾® H2PO4-

29) _____

E)

 

CO2 + H2O ¾®  H2CO3 ¾® HCO3 - + H+

30) _____

 

31-35. Matching

A)

Carbohydrates

1C:2H:1O

31) _____

B)

Lipids

~1C:~2H:<1O

32) _____

C)

Proteins

H, (NH2), (COOH), and (R)

33) _____

D)

 

Arachidonic acid

34) _____

E)

 

Vasopressin

35) _____

 


 

36-40. Matching

A)

Monosacchrides

starch

41) _____

B)

Disaccharides

lactose

42) _____

C)

Polysaccharides

maltose

43) _____

D)

 

ribose

44) _____

E)

 

deoxyribose

45) _____

 

41-45. Matching

A)

Monosacchrides

glucose

41) _____

B)

Disaccharides

fructose

42) _____

C)

Polysaccharides

galactose

43) _____

D)

 

sucrose

44) _____

E)

 

glycogen

45) _____

 

46-50. Matching

A)

Glycerol

a chain of three carbons with hydrogens and hydroxyl

46) _____

B)

Fatty acids

carbons with hydrogen attached and a carboxyl group

47) _____

C)

Glycerides

two fatty acids connected by a carbon ring

48) _____

D)

Eicosanoids

Glycerol with one, two or three fatty acids

49) _____

E)

Phospholidids

Glyceride with phosphateattached

50) _____

 

51-55. Matching

A)

Purines

Cytosine

51) _____

B)

Pyrimidines

Thymine

52) _____

C)

 

Uracil

53) _____

D)

 

Adenine

54) _____

E)

 

Guanone

55) _____

 

56-60. Matching

A)

nucleoside

ribose or deoxyribose and a nitrogenous base

56) _____

B)

nucleotide

ribose or deoxyribose, a nitrogenous base and phosphate

57) _____

C)

nucleic acid

chains of nucleotides

58) _____

D)

 

 

59) _____

E)

 

 

60) _____

 

61-65. Matching

A)

adenine

pairs with adenine

61) _____

B)

guanine

pairs with guanine

62) _____

C)

thymine

pairs with thymine

63) _____

D)

cytosine

pairs with cytosine

64) _____

E)

 

pairs with uracil

65) _____

 

66-70. Matching

A)

RNA

ribonucleic acid

66) _____

B)

pRNA

precursor RNA

67) _____

C)

mRNA

messenger RNA

68) _____

D)

tRNA

transfer RNA

69) _____

E)

rRNA

ribosomal RNA

70) _____

 


 

71-75. Place the following steps of Transcription in order

A)

introns are removed

 

71) _____

B)

messenger RNA carries genetic code to cytoplasm of cell

 

72) _____

C)

RNA polymerase binds at the promoter sequence of the DNA

 

73) _____

D)

precursor RNA formed from DNA - includes introns and exons

 

74) _____

E)

messenger RNA formed by splicing together exons of the precursor RNA

 

75) _____

 

76-80. Place the following steps of Translation in order (some steps repeat)

A)

mRNA attaches to ribosomes

 

76) _____

B)

tRNA with an appropriate anticodon carries in a specific amino acid

 

77) _____

C)

adjacent amino acids are linked by peptide bonds

 

78) _____

D)

a termination sequence is reached

 

79) _____

E)

 

 

80) _____

 

81-85. Matching

A)

Codon

a triplet code of mRNA

81) _____

B)

Anticodon

a triplet code of tRNA

82) _____

C)

 

corresponds to a triplet code of cDNA

83) _____

D)

 

corresponds to a triplet code of DNA

84) _____

E)

 

 

85) _____

 

86-90. Matching

A)

Decomposition

breaks down molecules

86) _____

B)

Synthesis

usually provides energy

87) _____

C)

 

assembles larger molecules

88) _____

D)

 

usually uses energy

89) _____

E)

 

also referred to as Anabolism

90) _____

 

91-95. Matching

A)

Hydrolysis

AB + H2O —→ A-OH + B-H

91) _____

B)

Dehydration synthesis

A-OH + B-H —→ AB + H2O

92) _____

C)

Phosphorylation

A + Pi —→ A-Pi

93) _____

D)

Dephosphorylation

A-Pi —→ A + Pi

94) _____

E)

Reduction

A + H —→ A-H

95) _____

 

96-100. Matching

A)

enzymes

act as catalysts

96) _____

B)

cofactors

help hold the confirmation of an enzyme

97) _____

C)

coenzymes

can carry hydrogen (electrons)

98) _____

D)

none of the above

can carry acetyl groups

99) _____

E)

 

usually bind to substrate

100) _____

 

101-105Matching

A)

Glycolysis

breaks down glucose to two pyruvate molecules

101) _____

B)

Decarboxylation

formation of acetyl-coenzyme A from pyruvate

102) _____

C)

Krebs cycle

yield carbon dioxide, reduced coenzymes and ATP

103) _____

D)

Electron transport system

uses oxygen to yield ATP

104) _____

E)

 

requires NADH, FADH2, Oxygen and ADP

105) _____

 


 

106-110. Matching

A)

Glycolysis

pyruvate —→ glucose

106) _____

B)

Gluconeogenesis

glucose —→ pyruvate

107) _____

C)

Glycogenolysis

glucose —→ glycogen

108) _____

D)

Glycogenesis

glycogen —→ glucose

109) _____

E)

 

some amino acids and lactate —→pyruvate

110) _____

 

111-115. Matching

A)

lipolysis

Glycerol —→ pyruvate (for TCA cycle)

111) _____

B)

aminolysis

Fatty acids —→ acetyl CoA (beta oxidation)

112) _____

C)

none of the above

Fatty acids —→ Ketones

113) _____

D)

 

some amino acids —→ phosphenopyruvate

114) _____

E)

 

some amino acids —→ acetyl CoA

115) _____

 

116-120. Matching

A)

inner surface of membrane

phosphate based

116) _____

B)

outer surface of membrane

lipid and cholesterol based

117) _____

C)

interior of membrane

hydrophilic

118) _____

D)

 

hydrophobic

119) _____

E)

 

water soluble ions and molecules cannot enter this region

120) _____

 

121-125. Matching

A)

Channels

passageways in the cell membrane

121) _____

B)

Active transport pumps

proteins with enzymes that catalyze ATP for energy for transport across the cell membrane

122) _____

C)

Transporters

proteins without enzymatic activity that transport substances across the cell membrane

123) _____

D)

Transmembrane receptors

proteins that extend through the cell membrane to communicate with proteins on the inner surface

124) _____

E)

Transmembrane enzymes

proteins with enzymatic activity on the inner surface of the cell membrane

125) _____

 

126-130. Matching

A)

Simple diffusion

lipid soluble substances can diffuse through the cell membrane

126) _____

B)

Diffusion through channels

water soluble substances can pass through channels

127) _____

C)

Diffusion using Carrier Proteins

uses a Carrier Protein that binds to the substance

128) _____

D)

Osmosis

diffusion of water across a cell membrane

129) _____

E)

Filtration

movement of water across a cell membrane due to hydrostatic pressure

130) _____

 

131-135. Matching

A)

Iso-osmotic

same osmolarity as the cellular cytoplasm

131) _____

B)

Hypo-osmotic

lower osmolarity than the cytoplasm

132) _____

C)

Hyper-osmotic

higher osmolarity than the cytoplasm

133) _____

D)

Hypotonic

causes cells to swell

134) _____

E)

Hypertonic

causes cells to shrink

135) _____

 


 

136-140. Matching

A)

Chemical driving force

determined by the concentration gradient

136) _____

B)

Electrical driving force

determined by the distribution of charges

137) _____

C)

Electrochemical driving force

determined by concentration gradient and charges

138) _____

D)

Equilibrium potential

where the chemical and electrical forces are equal

139) _____

E)

 

another name for the membrane potential

140) _____

 

141-145. Matching

A)

Primary active transport

Ion pumps

141) _____

B)

Secondary active transport

exchange pumps

142) _____

C)

 

co-transport

143) _____

D)

 

counter-transport

144) _____

E)

 

Sodium-Potassium Pump

145) _____

 

146-150. Matching

A)

Extracellular fluid

high concentration of sodium ions

146) _____

B)

Intracellular fluid

high concentration of chloride ions

147) _____

C)

 

high concentration of potassium ions

148) _____

D)

 

high concentration of negatively charged proteins

149) _____

E)

 

high concentration of calcium ions

150) _____

 

151-155Matching

A)

Basolateral membrane

commonly has Na+ - K+ pumps

151) _____

B)

Apical membrane

commonly has Na+ channels

152) _____

C)

 

commonly has Na+ - Glucose Co-transporter

153) _____

D)

 

commonly has glucose carrier

154) _____

E)

 

faces the interstitial fluid

155) _____

 

156. Steroids

A)

are derived from cholesterol

156) _____

B)

based on 4 rings of carbons

 

C)

include progesterone

 

D)

include estradiol

 

E)

all of the above

 

 

157. Enzymes usually act by

A)

attaching to a reactant (substrate) or reactants (substrats)

157) _____

B)

lowering the activation energy of the reaction

 

C)

 

 

D)

 

 

E)

 

 

 

158. The activity of an enzyme is affected by

A)

The catalytic rate of the enzyme

158) _____

B)

Changes in enzyme concentration

 

C)

Affinity of the enzyme for the reactant (substrate)

 

D)

Allosteric regulation

 

E)

All of the above

 

 


 

159. Allosteric regulation of enzyme activity

A)

involves a modulator binding to a regulatory site of an enzyme

159) _____

B)

can activate an enzyme

 

C)

can inhibit an enzyme

 

D)

A and B

 

E)

All of the above

 

 

160. Cofactors

A)

help an enzyme hold its normal conformation

160) _____

B)

include metal ions

 

C)

include vitamins

 

D)

B and C

 

E)

All of the above

 

 

161. pH equals

A)

- log10 [H+]

161) _____

B)

+ log10 [H+]

 

C)

- loge [H+]

 

D)

+ loge [H+]

 

E)

none of the above

 

 

162. One mole of glucose dissolved in enough water to make 1.0 liter of solution will give a glucose solution that

A)

is called a 1M solution of glucose

162) _____

B)

has an osmolarity of 1M

 

C)

has an osmolarity of 2M

 

D)

A and B

 

E)

A and C

 

 

163. One mole of sodium chloride dissolved in enough water to make 1.0 liter of solution will give a sodium chloride solution that

A)

is called a 1M solution of sodium chloride

163) _____

B)

has an osmolarity of 1M

 

C)

has an osmolarity of 2M

 

D)

A and B

 

E)

A and C

 

 


 

Essay questions – Answer four (4) of the following six (6) questions(10 points each)

 

1. Compare and contrast molarity, osmolarity and pH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. Compare and contract carbohydrates, lipids and proteins.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

3. Describe the overall process of protein synthesis involving DNA, RNA and ribosomes. Include a description of the process of gene activation and the role of RNA polymerase.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4. Compare and contrast dehydration synthesis and hydrolysis.  Include a description of the role of enzymes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

5. Compare and contrast passive transport and active transport.  Provide examples of each..

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6. Describe the structure and function of membrane channels, as they are involved in membrane transport

 

 

 


Practice Questions – Exam # 1 (mainly from Chemistry of Life CD)

1. A compound is an acid if it

A)      takes H+ from water

B)      contains H

C)      donates H+ to water

D)      releases ions into water

E)      breaks up water molecules

 

2. A solution is very acidic if it

A).    has a very low pH value

B).    has a high hydronium ion concentration

C).    has a high hydrogen ion concentration

D).    (A) and (B)

E).    all of the above

 

3. In water, every sulfuric acid molecule transfers H+ to water and becomes an HSO4- ion.  Some HSO4- ions give off another H+ to form SO4-2 ions.  Which statement is true?

A).    H2SO4 is a strong acid and HSO4- is a weak acid

B).    Both H2SO4 and HSO4- are strong acids

C).    Both H2SO4 and HSO4- are weak acids

D).    H2SO4 is an acid and HSO4- is not an acid

 

 

4. Compounds that release OH- are bases because

A).    OH- has a strong tendency to combine with H+

B).    bases are defined as compounds that release OH-

C).    OH- makes solutions more acidic

D).    Both A) and B)

E).    None of the above

 

5. Which answer is a true statement about pH values?

A)      A high pH corresponds to a H+ concentration

B)      pH is important in life mainly because it affects the cohesion of water

C)      Stomach juice has a high pH

D)      Pure water has a pH of 0

E) None of the above

 

6. Factory smoke has led to acid rain that lowered the pH of a lake to 5.0.  What is the H+ concentration in the lake?

A)      10-5 M

B)      105 M

C)      5.0 M

D)      5%

E)      log(5) M

 

7. Your tank of fish needs a pH of 5, and the pH is 7 at present.  What should you do to the H+ concentration?

A)      Cut it in half

B)      Reduce it to 1/100 of its present value

C)      Double it

D)      Raise it to 100 times its present value

E)      Raise it to 200 times its present value


 

8. Which statement is true of pH buffers?

A)      They consist of strong acids and strong bases

B)      They prevent changes in the pH of the blood

C)      They consist of weak acids (and their conjugate bases)

D)      Both (A) and (B)

E)      Both (B) and (C)

 

9. Polymers that contain sugars

A)      may store hereditary information

B)      may store energy

C)      may protect cells

D)      Both (B) and (C)

E)      All of the above

 

10. The alpha and beta forms of glucose, found in starch and cellulose differ in

A).    whether the molecule is a ring or an open chain

B).    how one of the –OH groups is oriented

C).    whether the ring contains five or six C atoms

D).    whether the first C atom is bound to one or two O atoms

E).    none of the above

 

11. Which statement is true of sucrose?

A)      It is a disaccharide

B)      It contains glucose

C)      It is table sugar

D)      Both A) and C)

E)      All of the above

 

12. The sugar that is the principal circulating fuel molecule in the human body is

A)      sucrose

B)      galactose

C)      fructose

D)      glucose

E)      lactose

 

13.What do fats, steroids, and waxes have in common?

A)      Moderate polarity

B)      Low solubility in water

C)      They occur in membranes

D)      Both A) and C)

E)      Both B) and C)

 

14. The three-carbon backbone of fats is derived from

A)      glycerol

B)      fatty acid

C)      guiacol

D)      analine

E)      cholesterol


 

15. In fat synthesis _________ and fatty acids combine to make fats plus ________.

A)      glucose, phosphate

B)      esters, phosphate

C)      esters, water

D)      phosphate, glycerol

E)      glycerol, water

 

16. In the reaction that builds a fat _______ groups react with _______ groups.

A)      phosphate, amino

B)      hydroxyl, phosphate

C)      hydroxyl, carboxyl

D)      carboxyl, amino

E)      sulfhydryl, carboxyl

 

17. Phospholipids are important for

A)      water proofing cell walls

B)      storing energy

C)      preventing leakage from cells

D)      lubricating cells

E)      stiffening cells

 

18. To find the best source of phospholipids, look at

A)      storage droplets

B)      membranes

C)      surfaces of leaves

D)      cell  walls

E)      nasal mucus

 

19. The most unsaturated fats have

A).    the most double bonds

B).    the longest hydrocarbon tails

C).    the shortest hydrocarbon tails

D).    the fewest double bonds

E).    the highest ratio of H to C

 

 

20 Which statement is true of phospholipids?

A)      Their synthesis uses fatty acids

B)      Some of their tails have double bonds

C)      They all ionize

D)      All of the above

E)      Both (A) and (B)

 

21. Which fact is most important in causing phospholipids to behave as they do in water?

A)      Hydrocarbons attract one another

B)      Hydrogen is more electronegative than oxygen

C)      Nonpolar groups repel water

D)      Water molecules make hydrogen bonds

E)      Phosphate groups can bind together


 

22. In a membrane, the ________ of the phospholipids in one monolayer face the _______ of the phospholipids in the other monolayer.

A)      heads, heads

B)      heads, tails

C)      tails, tails

D)      Sometimes A), sometimes C)

E)      None of these, a membrane is a monolayer

 

23. It is difficult for molecules to pass through the phospholipid bilayer because

A)      hydrocarbons repel water

B)      polar molecules attract one another

C)      proteins hold phospholipids in place

D)      cholesterol holds phospholipids in place

E)      there is a water film between the monolayers

 

24. Which biological activity does not directly involve proteins?

A)      Defending cells against viruses

B)      Sensing light

C)      Breaking food polymers into smaller molecules

D)      Changing the shape of a cell

E)      None of the above, proteins are involved in all of the above

 

25.A protein that is coiled and wrapped around itself has

A)      primary structure

B)      secondary structure

C)      tertiary structure

D)      All of the above

E)      None of the above

 

26 In a protein, peptide bonds connect

A)      C=O to C-R

B)      C=O to N-H

C)      C-R to N-H

D)      N-H to C-H

E)      All of the above

 

27. The rate of product formation peaks at 45 C and then markedly decreases after temperature surpasses 50 C. In this example, increasing temperature is affecting the critical enzymes by

A)      breaking peptide bonds

B)      breaking hydrogen bonds

C)      changing primary structure

D)      breaking disulfide bridges

E)      ionizing side chains

 

28. When a protein has been unfolded enough to lose its function, the protein has been

A)      denatured

B)      distempered

C)      hydrolyzed

D)      metastasized

E)      none of the above


 

29. Which factor is most important in determining a protein's optimum pH?

A)      The pH of the protein's environment

B)      The number of amino groups in the protein's backbone

C)      The locations of side-chain carboxyl groups

D)      The sensitivity of hydrocarbon side chains to pH

 

30. Some of the strongest biological structures (beaks, claws, nails) are made of many molecules of the protein keratin.  What else is true of structures made of keratin?

A).    Disulfide bridges bind the proteins together

B).    Each protein is a single long alpha helix

C).    Hair is another example

D).    Both (A) and (B)

E).    All of the above

 

31. Which statement is true of nucleic acids?

A)      rRNA positions amino acids along mRNA

B)      mRNA binds amino acids together to make proteins

C)      mRNA is part of the ribosome

D)      DNA carries information for making RNA

E)      Both B) and D)

 

32. The information in DNA tells a cell how to make

A)      proteins

B)      DNA

C)      TRNA

D)      Both A) and B)

E)      All of the above

 

33. RNA nucleotides contain ________ than DNA nucleotides

A)      more oxygen

B)      different purines

C)      more hydrogen

D)      less phosphorus

E)      None of he above

 

34. If you measure the amounts of the bases in any sample of DNA, you will find that

A)      the amount of A + the amount of T = the amount of G + the amount of C

B)      the amount of A + the amount of G = the amount of T + the amount of C

C)      the amount of A = the amount of G = the amount of G = the amount of C

D)      the amount of A + the amount of C = the amount of G + the amount of U

E)      None of the above

 

35. Which statement expresses a real difference between DNA and RNA?

A)      DNA can make a double helix, RNA cannot

B)      DNA is much longer than RNA

C)      DNA has more kinds of bases than RNA

D)      Both A) and B)

E)      All of the above


 

36. What holds the strands of the DNA double helix together?

A)      Attraction between the ionized phosphates

B)      Covalent bonds between A and T, and between C and G

C)      Hydrogen bonds between purines and pyrimidines

D)      Attractions between polar sugars

E)      Proteins that bind to DNA bases

 

37. In an experiment, a scientist fed radioactive nucleotides to a cell that was previously non-radioactive.  After the cell duplicated its DNA, which statement would be true?

A)      The old DNA helices would be non-radioactive; the new ones would be radioactive

B)      In each strand, half the nucleotides would be radioactive and half non-radioactive

C)      Each DNA helix would have one radioactive strand and one non-radioactive strand.

 

38. In DNA replication

A)      the original strands remain together

B)      the replica strands are complementary to the templates

C)      each replica strand has the same base sequences as its template

D)      DNA copies itself

E)      Both B) and D)

 

 

39. You can distinguish transcription from replication because

A)      only transcription requires an enzyme

B)      only one strand is used as a template in transcription

C)      the transcription product contains U

D)      Both (B) and (C)

E)      All of the above

 

40. Which statement is true of an enzyme?

A).    Enzymes can be either proteins or RNA molecules

B).    When a cell makes an enzyme, it makes many copies

C).    Their substrate specifically involves matching of shapes

D).    Both (A) and (B)

E).    All of the above

 

41. Enzymes speed reactions mainly by

A)      providing activation energy

B)      protecting the catalysts

C)      lowering the activation energy

D)      raising the kinetic energy of the reactants

E)      None of the Above

 

42. Which fact is most important in explaining how enzymes speed reactions?

A).    Large molecules collide more energetically than small molecules

B).    Every reaction step adds to the time required for the overall reaction

C).    Very low potential energy tends to make molecules unstable

D).    High-energy collisions are less common than low-energy collisions

E).    It takes less energy to break a hydrogen bond than a covalent bond

 


 

43. What is the osmolarity of 0.01 M NaCl in solution?

A)      1 M

B)      0.1 M

C)      0.2 M

D)      0.01 M

E)      0.02 M

 

44. The molarity of 0.333 M glucose (MW 180) is

A)      0.167 M

B)      0.333 M

C)      1.8 M

D)      2.0 M

E)      none of the above

 

45. What is the osmolarity of 0.029 M sucrose (MW 342) in solution?

A)      0.015 M

B)      0.029 M

C)      1.7 M

D)      3.4 M

E)      none of the above

 

46. What is the Hydrogen Ion concentration of 0.01 M HCl in solution?

A)      1 M

B)      0.1 M

C)      0.01 M

D)      0.001M

E)      none of the above

 

47. What is the pH of 0.001 M HCl in solution?

A)      0.1

B)      1

C)      2

D)      3

E)      4

 

48. Which of the following choices will decrease extracellular pH?

A)      adding hydrogen ions

B)      adding hydroxyl ions

C)      removal of water

D)      B and C

E)      A and C

 

 

49. Which of the following choices will increase extracellular pH?

A)      adding hydrogen ions

B)      adding hydroxyl ions

C)      removing hydrogen ions

D)      B and C

E)      A and C


 

50. Which of the following choices is an example of a chemical buffer?

A)      a strong acid

B)      a strong base

C)      a weak acid and its conjugate base

D)      an acid with a high dissociation constant

E)      none of the above

 

51. Which of the following has a relatively high buffering capacity?

A)      0.9% NaCl

B)      Sorensen's buffer

C)      blood plasma

D)      B and C

E)      none of the above

 

52. Which of the following is found in a bicarbonate buffer?

A)      C2H3O2-

B)      HCO3-

C)      NH4+

D)      ClO-

E)      none of the above

 

53. Molarity refers to

A)      molecular weight

B)      concentration of solvent

C)      moles of solid solute / liter of solution

D)      moles of dissolved solute particles / liter of solution

E)      none of the above

 

54. Osmolarity refers to

F)      molecular weight

G)     concentration of solvent

H)      moles of solid solute / liter of solution

I)         moles of dissolved solute particles / liter of solution

J)       none of the above

 

 

55. Osmosis refers to

A)      movement of solute

B)      movement of water

C)      bulk flow

D)      all of the above

E)      none of the above

 

 

56. Dialysis refers to

A)      movement of solute

B)      movement of water

C)      bulk flow

D)      all of the above

E)      none of the above


 

57. Water is a liquid and an excellent solvent due to ______ bonding between water molecules.

A) covalent

B) ionic

C) hydrogen

D) all of the above

E) none of the above

 

58. As temperature increases

A) diffusion decreases   

B) diffusion increases

C) diffusion stops

D) diffusion decreases and then in creases

F)      none of the above

 

59. As molecular weight of the solute increases

A) diffusion decreases   

B) diffusion increases

C) diffusion stops

D) diffusion decreases and then increases

E) none of the above

 

60. Osmotic pressure refers to the

A) force of water movement due to its concentration gradient

B) force of solute movement due to its concentration gradient

C) same phenomenon as hydrostatic pressure

 

61. The DNA nucleotide sequence Adenine, Thymine, Cytosine will lead to the messenger RNA nucleotide sequence

A) A, T, C

B) T, A, G

C) U, A, G

D) A, U, C

E) none of the above

 

62. The DNA nucleotide sequence Adenine, Thymine, Cytosine will correspond to the transfer RNA nucleotide sequence

A) A, T, C

B) T, A, G

C) U, A, G

D) A, U, C

E) none of the above

 


63.  The chemical structure to the right  is

A).    ADP

B).    ATP

C).    RNA

D).    a Phospholipid

E).    none of the above

 

 

 

 

 

 

 

 

 

 

64. The chemical structure to the right is

A).    glucose

B).    a Phospholipid

C).    an Unsaturated fat

D).    a Saturated fat

E).    none of the above

 

 

 

 

 

65. The following molecules can be joined together by

A).    dehydration synthesis

B).    hydrolysis

C).    an anabolic reaction

D).    both (A) and (C)

E).    both (B) and (C)

 

 

 

 

 

 

 

 

 

 

 

66. The chemical to the right is referred to as

A).    a phosphoglyceride

B).    a phospholipid

C).    phosphatidyl choline

D).    both (A) and (B)

E).    all of the above

 

 

 

 

 

 

67. The molecule to the right is

A).    starch

B).    glycogen

C).    cellulose

D).    either (A) or (B)

E).    all of the above

 

 

 

 

68. The chemical to the right is

A).    testosterone

B).    estradiol

C).    aldosterone

D).    cholesterol

E).    none of the above

 

 

 

 

69. The molecule to the right is

A).    sucrose

B).    maltose

C).    lactose

D).    galactose

E).    glycogen

 

 

 

70. The molecule to the right is

A).    ribose

B).    glucose

C).    glycogen

D).    glycerol

E).    glucagon

 

 

© David G. Ward, Ph.D.  Last modified by wardd 23 May, 2006