Question 1

Which one of the following amine bases does not appear in DNA?

Accepted Answer

A) adenine 
B) cytosine 
C) guanine 
D) uracil 
A) adenine 
B) cytosine 
C) guanine 
D) uracil

Question 2

Which ester below formed propanoic acid and isopropyl alcohol by hydrolysis reaction with water?

Accepted Answer

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

Question 3

The C-Br bond in CH3CH2Li is a ________ (nonpolar,polar)covalent bond with a ________ (δ+,δ-)charge on the carbon atom and a ________ (δ+,δ-)charge on the lithium atom.

Accepted Answer

Question 4

Based on the structure of its side chains,the amino acid shown below can be classified as

Accepted Answer

A) acidic. 
B) basic. 
C) neutral,non-polar. 
D) neutral,polar. 
A) acidic. 
B) basic. 
C) neutral,non-polar. 
D) neutral,polar.

Question 5

Based on the structure of its side chains,the amino acid shown below can be classified as

Accepted Answer

A) acidic. 
B) basic. 
C) neutral,non-polar. 
D) neutral,polar. 
A) acidic. 
B) basic. 
C) neutral,non-polar. 
D) neutral,polar.

Question 6

What are the products of acid-catalyzed hydrolysis reaction of amides and water?

Accepted Answer

A) an alcohol and an alkane 
B) an amine and a ketone 
C) a carboxylic acid and an amine salt 
D) an ester and an ether 
A) an alcohol and an alkane 
B) an amine and a ketone 
C) a carboxylic acid and an amine salt 
D) an ester and an ether

Question 7

None of the listed compounds contains a ring.Which has at least one singly-bonded carbon atom?

Accepted Answer

A) C2H6 
B) C3H4 
C) C4H8 
D) All of these 
A) C2H6 
B) C3H4 
C) C4H8 
D) All of these

Question 8

Which of the following is a correct name for an alkyne?

Accepted Answer

A) 3-methyl-2-pentyne 
B) 5-methyl-3-pentyne 
C) 2,2-dimethyl-4-pentyne 
D) 3,3-dimethyl-1-pentyne 
A) 3-methyl-2-pentyne 
B) 5-methyl-3-pentyne 
C) 2,2-dimethyl-4-pentyne 
D) 3,3-dimethyl-1-pentyne

Question 9

The condensed structures for the two isomers of C4H10 are (1)________ and (2)________.

Accepted Answer

(1)CH₃CH₂CH₂C

Question 10

Which name is not correct?

Accepted Answer

A) 2,2-dimethylbutane 
B) 2,3-dimethylpentane 
C) 2,3,3-trimethylbutane 
D) 2,3,3-trimethylpentane 
A) 2,2-dimethylbutane 
B) 2,3-dimethylpentane 
C) 2,3,3-trimethylbutane 
D) 2,3,3-trimethylpentane

Question 11

Which one of the following compounds is an alcohol?

Accepted Answer

A) CH3OCH3 
B) CH3COCH3 
C) (CH3)2CHOH 
D) CH3CO2H 
A) CH3OCH3 
B) CH3COCH3 
C) (CH3)2CHOH 
D) CH3CO2H

Question 12

Based on the structure of its side chains,the amino acid shown below can be classified as

Accepted Answer

A) acidic. 
B) basic. 
C) neutral,non-polar. 
D) neutral,polar. 
A) acidic. 
B) basic. 
C) neutral,non-polar. 
D) neutral,polar.

Question 13

All but one of the common amino acids contain a -NH2 amino group.Which one contains an -NH- amino group as part of a ring structure?

Accepted Answer

A) phenylalanine 
B) proline 
C) tryptophan 
D) tyrosine 
A) phenylalanine 
B) proline 
C) tryptophan 
D) tyrosine

Question 14

A partial hydrolysis of a protein yielded the following fragments: Ser-Gly,Gly-Ala,Gly-Ala-Val,Val-Leu,Ala-Val.What is the sequence of amino acids in the polypeptide?

Accepted Answer

A) Gly-Leu-Ser-Ala-Val 
B) Leu-Ala-Gly-Val-Ser 
C) Ser-Gly-Ala-Val-Leu 
D) Val-Ala-Gly-Ser-Leu 
A) Gly-Leu-Ser-Ala-Val 
B) Leu-Ala-Gly-Val-Ser 
C) Ser-Gly-Ala-Val-Leu 
D) Val-Ala-Gly-Ser-Leu

Question 15

What is the name of the product formed by the reaction of butanoic acid with methylamine?

Accepted Answer

A) N-methylbutamide 
B) N-methylbutanamide 
C) pentanone 
D) pentyl amine 
A) N-methylbutamide 
B) N-methylbutanamide 
C) pentanone 
D) pentyl amine

Question 16

Hydrogenation of vegetable oils converts them into what type of molecule?

Accepted Answer

A) esters 
B) ethers 
C) polymers 
D) saturated fats 
A) esters 
B) ethers 
C) polymers 
D) saturated fats

Question 17

Identify the amino acid shown below.

Accepted Answer

A) Methionine (Met) 
B) Phenylalanine (Phe) 
C) Proline (Pro) 
D) Tryptophan (Trp) 
A) Methionine (Met) 
B) Phenylalanine (Phe) 
C) Proline (Pro) 
D) Tryptophan (Trp)

Question 18

The reaction of an amine and a carboxylic acid produces what kind of compound?

Accepted Answer

A) alcohol 
B) amide 
C) ester 
D) ketone 
A) alcohol 
B) amide 
C) ester 
D) ketone

Question 19

Hemoglobin is a protein molecule which contains 4 iron atoms.If the mass percent of iron is 0.342%,what is the molar mass of hemoglobin?

Accepted Answer

A) 1020 g/mol 
B) 16,300 g/mol 
C) 65,300 g/mol 
D) none of these 
A) 1020 g/mol 
B) 16,300 g/mol 
C) 65,300 g/mol 
D) none of these

Question 20

Identify the amino acid shown below.

Accepted Answer

A) Cysteine (Cys) 
B) Serine (Ser) 
C) Threonine (Thr) 
D) Tyrosine (Tyr) 
A) Cysteine (Cys) 
B) Serine (Ser) 
C) Threonine (Thr) 
D) Tyrosine (Tyr)

Exam 23: Organic and Biological Chemistry

Which one of the following amine bases does not appear in DNA?

Which ester below formed propanoic acid and isopropyl alcohol by hydrolysis reaction with water?

The C-Br bond in CH3CH2Li is a ________ (nonpolar,polar)covalent bond with a ________ (δ+,δ-)charge on the carbon atom and a ________ (δ+,δ-)charge on the lithium atom.

Based on the structure of its side chains,the amino acid shown below can be classified as

Based on the structure of its side chains,the amino acid shown below can be classified as

What are the products of acid-catalyzed hydrolysis reaction of amides and water?

None of the listed compounds contains a ring.Which has at least one singly-bonded carbon atom?

Which of the following is a correct name for an alkyne?

The condensed structures for the two isomers of C4H10 are (1)________ and (2)________.

Which name is not correct?

Which one of the following compounds is an alcohol?

Based on the structure of its side chains,the amino acid shown below can be classified as

All but one of the common amino acids contain a -NH2 amino group.Which one contains an -NH- amino group as part of a ring structure?

A partial hydrolysis of a protein yielded the following fragments: Ser-Gly,Gly-Ala,Gly-Ala-Val,Val-Leu,Ala-Val.What is the sequence of amino acids in the polypeptide?

What is the name of the product formed by the reaction of butanoic acid with methylamine?

Hydrogenation of vegetable oils converts them into what type of molecule?

Identify the amino acid shown below.

The reaction of an amine and a carboxylic acid produces what kind of compound?

Hemoglobin is a protein molecule which contains 4 iron atoms.If the mass percent of iron is 0.342%,what is the molar mass of hemoglobin?

Identify the amino acid shown below.

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Filters

The C-Br bond in CH₃CH₂Li is a (nonpolar,polar)covalent bond with a (δ+,δ-)charge on the carbon atom and a (δ+,δ-)charge on the lithium atom.

The condensed structures for the two isomers of C₄H₁₀ are (1) and (2).

All but one of the common amino acids contain a -NH₂ amino group.Which one contains an -NH- amino group as part of a ring structure?