Question 1

Choose the INCORRECT statement.

Accepted Answer

A) Triglycerides are glyceryl esters. 
B) Fats and oils are glyceryl esters. 
C) Oils have predominately saturated acid components. 
D) Oils are liquid at room temperature. 
E) Pure fats and oils are colorless,odorless and tasteless. 
A) Triglycerides are glyceryl esters. 
B) Fats and oils are glyceryl esters. 
C) Oils have predominately saturated acid components. 
D) Oils are liquid at room temperature. 
E) Pure fats and oils are colorless,odorless and tasteless.

Question 2

Below is a double stranded DNA composed of one strand containing 15N atoms and the other strand containing 14N atoms.If the cell which contains this DNA is grown for one generation (replication)on 15N medium and then transferred to 14N media for a second generation,what would the resulting double stranded DNA molecules look like?

Accepted Answer

A) Four molecules;each containing one 14N strand and one 15N strand. 
B) Two molecules;one with a 15N and a 14N strand,the other with two 14N strands. 
C) Four molecules;three containing one 14N strand and one 15N strand and one molecule with two 14N strands. 
D) Four molecules;one with two 15N strands,two molecules with two 14N strands,and one molecule with one 14N and one 15N strands. 
E) Four molecules;all molecules have 14N strands. 
A) Four molecules;each containing one 14N strand and one 15N strand. 
B) Two molecules;one with a 15N and a 14N strand,the other with two 14N strands. 
C) Four molecules;three containing one 14N strand and one 15N strand and one molecule with two 14N strands. 
D) Four molecules;one with two 15N strands,two molecules with two 14N strands,and one molecule with one 14N and one 15N strands. 
E) Four molecules;all molecules have 14N strands.

Question 3

A typical E.coli bacterium is a cylindrical cell about 2 μm long and 1 μm in diameter,weighing about 1.8 × 10-12 g and containing 80% water by volume.Calculate the number of lipid molecules present,assuming their average molecular weight is 688 g/mol and the lipid content is 1.9%.

Accepted Answer

A) 8.3 × 1010  
B) 2.1 × 1010  
C) 2.4 × 107  
D) 1.6 × 109  
E) 3.0 × 107  
A) 8.3 × 1010  
B) 2.1 × 1010  
C) 2.4 × 107  
D) 1.6 × 109  
E) 3.0 × 107

Question 4

Which of the following is unimportant for tertiary structure of the proteins?

Accepted Answer

A) peptide bonds 
B) salt linkages 
C) hydrogen bonding 
D) disulfide linkages 
A) peptide bonds 
B) salt linkages 
C) hydrogen bonding 
D) disulfide linkages

Question 5

Compounds which are optical isomers of one another but differ in physical and chemical properties are known as what?

Accepted Answer

A) geometric isomers 
B) enantiomers 
C) racemic compounds 
D) allotropes 
E) diastereomers 
A) geometric isomers 
B) enantiomers 
C) racemic compounds 
D) allotropes 
E) diastereomers

Question 6

All of the known elements occur in measurable amounts in the human body.

Accepted Answer

A) True 
 B)False

Question 7

By definition,exergonic reaction has:

Accepted Answer

A) ΔG= positive value 
B) ΔG= negative value 
C) ΔH= positive value 
D) ΔH= negative value 
E) ΔS= positive value 
A) ΔG= positive value 
B) ΔG= negative value 
C) ΔH= positive value 
D) ΔH= negative value 
E) ΔS= positive value

Question 8

Lactose,the sugar found in milk,is a disaccharide of galactose and glucose in a 1,4 linkage.What is the configuration of the 1,4 linkage between the two glycoses in lactose?

Accepted Answer

A) β configuration 
B) α configuration 
C) D configuration 
D) axial configuration 
E) chair configuration 
A) β configuration 
B) α configuration 
C) D configuration 
D) axial configuration 
E) chair configuration

Question 9

Which of the following examples of protein structure would be classified as the tertiary structure of a protein?

Accepted Answer

A) β-pleated sheet 
B) gly-leu-trp-lys-lys-arg-met 
C) three identical subunits 
D) an elongated α-helix between two β-pleated sheets 
E) amorphous,globular peptide 
A) β-pleated sheet 
B) gly-leu-trp-lys-lys-arg-met 
C) three identical subunits 
D) an elongated α-helix between two β-pleated sheets 
E) amorphous,globular peptide

Question 10

Choose the INCORRECT statement.

Accepted Answer

A) Fats become rancid when they hydrolyze and cleave at the double bonds by oxidation. 
B) Antioxidants retard oxidative rancidity of fats. 
C) Medical studies correlate a high intake of saturated fats and coronary heart disease. 
D) Healthy diets call for the substitution of saturated fatty acids with unsaturated fatty acids in foods. 
E) In general,mammal fats are unsaturated. 
A) Fats become rancid when they hydrolyze and cleave at the double bonds by oxidation. 
B) Antioxidants retard oxidative rancidity of fats. 
C) Medical studies correlate a high intake of saturated fats and coronary heart disease. 
D) Healthy diets call for the substitution of saturated fatty acids with unsaturated fatty acids in foods. 
E) In general,mammal fats are unsaturated.

Question 11

Which of the following contains less than six carbon atoms?

Accepted Answer

A) deoxyribose 
B) glucose 
C) aldohexose 
D) methylcyclopentane 
E) benzene 
A) deoxyribose 
B) glucose 
C) aldohexose 
D) methylcyclopentane 
E) benzene

Question 12

ΔG° = -2880 kJ/mol for the oxidation of glucose (C6H12O6).What is ΔG° for the oxidation of 3.45 grams of glucose?

Accepted Answer

A) -342 kJ 
B) -55.2 kJ 
C) -0.215 kJ 
D) -9.94 × 103 kJ 
E) -621 kJ 
A) -342 kJ 
B) -55.2 kJ 
C) -0.215 kJ 
D) -9.94 × 103 kJ 
E) -621 kJ

Question 13

Which of the following combinations make up the nucleic acid,RNA?

Accepted Answer

A) phosphate ribose and the bases A,G,U,C 
B) phosphate ribose and the bases A,G,T,C 
C) phosphate deoxyribose and the bases A,G,T,C 
D) phosphate deoxyribose and the bases A,G,U,C 
A) phosphate ribose and the bases A,G,U,C 
B) phosphate ribose and the bases A,G,T,C 
C) phosphate deoxyribose and the bases A,G,T,C 
D) phosphate deoxyribose and the bases A,G,U,C

Question 14

Living cells are unable to convert glucose-6P into which of the following?

Accepted Answer

A) glycogen 
B) glucose 
C) coenzyme A 
D) polysaccharide stored in liver 
E) it may be metabolized 
A) glycogen 
B) glucose 
C) coenzyme A 
D) polysaccharide stored in liver 
E) it may be metabolized

Question 15

What is the direction of migration of the amino acid phenylalanine in a gel that is 0.25 M in NaH2PO4 and 0.50 M in Na2HPO4? For phenylalanine,pI = 5.74.

Accepted Answer

Question 16

Which molecule is optically active?

Accepted Answer

A) 2-chlorobutane 
B) 1-chlorobutane 
C) trans-propene 
D) cis-propene 
A) 2-chlorobutane 
B) 1-chlorobutane 
C) trans-propene 
D) cis-propene

Question 17

Which one of the following amino acids does not contain a basic side chain?

Accepted Answer

A) arginine 
B) histidine 
C) lysine 
D) threonine 
A) arginine 
B) histidine 
C) lysine 
D) threonine

Question 18

The R group CH2SH belongs to which amino acid?

Accepted Answer

A) aspartic acid 
B) phenylalanine 
C) cysteine 
D) tyrosine 
E) arginine 
A) aspartic acid 
B) phenylalanine 
C) cysteine 
D) tyrosine 
E) arginine

Question 19

Fats and oils differ in the nature of the acid components in the triglycerides.

Accepted Answer

A) True 
 B)False

Question 20

What is the correct structure for glyceryl trilinolenate?

Accepted Answer

A)    
B)    
C)    
D)    
E)   
A)    
B)    
C)    
D)    
E)

Exam 28: Chemistry of the Living State

Choose the INCORRECT statement.

A typical E.coli bacterium is a cylindrical cell about 2 μm long and 1 μm in diameter,weighing about 1.8 × 10-12 g and containing 80% water by volume.Calculate the number of lipid molecules present,assuming their average molecular weight is 688 g/mol and the lipid content is 1.9%.

Which of the following is unimportant for tertiary structure of the proteins?

Compounds which are optical isomers of one another but differ in physical and chemical properties are known as what?

All of the known elements occur in measurable amounts in the human body.

By definition,exergonic reaction has:

Lactose,the sugar found in milk,is a disaccharide of galactose and glucose in a 1,4 linkage.What is the configuration of the 1,4 linkage between the two glycoses in lactose?

Which of the following examples of protein structure would be classified as the tertiary structure of a protein?

Choose the INCORRECT statement.

Which of the following contains less than six carbon atoms?

ΔG° = -2880 kJ/mol for the oxidation of glucose (C6H12O6).What is ΔG° for the oxidation of 3.45 grams of glucose?

Which of the following combinations make up the nucleic acid,RNA?

Living cells are unable to convert glucose-6P into which of the following?

What is the direction of migration of the amino acid phenylalanine in a gel that is 0.25 M in NaH2PO4 and 0.50 M in Na2HPO4? For phenylalanine,pI = 5.74.

Which molecule is optically active?

Which one of the following amino acids does not contain a basic side chain?

The R group CH2SH belongs to which amino acid?

Fats and oils differ in the nature of the acid components in the triglycerides.

What is the correct structure for glyceryl trilinolenate?

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Filters

A typical E.coli bacterium is a cylindrical cell about 2 μm long and 1 μm in diameter,weighing about 1.8 × 10^-12 g and containing 80% water by volume.Calculate the number of lipid molecules present,assuming their average molecular weight is 688 g/mol and the lipid content is 1.9%.

ΔG° = -2880 kJ/mol for the oxidation of glucose (C₆H₁₂O₆).What is ΔG° for the oxidation of 3.45 grams of glucose?

What is the direction of migration of the amino acid phenylalanine in a gel that is 0.25 M in NaH₂PO₄ and 0.50 M in Na₂HPO₄? For phenylalanine,pI = 5.74.

The R group CH₂SH belongs to which amino acid?