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Consider the following general structure. Consider the following general structure. If the R group were HO-CH<sub>2</sub>-,this compound would be classified as: A) nonpolar,neutral B) polar,neutral C) polar,acidic D) polar,basic If the R group were HO-CH2-,this compound would be classified as:


A) nonpolar,neutral
B) polar,neutral
C) polar,acidic
D) polar,basic

E) A) and B)
F) B) and C)

Correct Answer

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How many different tripeptides composed of three different amino acids can be formed if glycine,alanine,and valine are mixed together and peptide bonds are allowed to form in all possible combinations?


A) 2
B) 3
C) 4
D) 6
E) 8

F) A) and E)
G) A) and C)

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Which of the following is the best definition of the term amino acid?


A) A carboxylic acid containing both an amine group and a variable alkyl group
B) A substance that yields hydronium ions in aqueous solution
C) A substance that donates protons in a chemical reaction
D) A substance that forms covalent bonds by accepting a pair of electrons
E) An organic acid containing the carboxyl group,having the general formula RCOOH

F) A) and B)
G) D) and E)

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Which of the following is the best definition of the term enzyme?


A) A molecule made of two or more simple sugar molecules
B) A substance that is found in living organisms and is insoluble in water but soluble in nonpolar solvents
C) A lipid having three cyclohexane rings and one cyclopentane ring
D) A small molecule characterized by a carboxyl group at one end of the carbon chain and an amine group on the carbon next to the carboxyl group
E) A catalyst that controls chemical reactions in a living system

F) B) and E)
G) A) and B)

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Consider the induced fit model of enzyme activity.Which of the following statements about this model is false?


A) The shape of the substrate is a close,but not exact,match to the shape of the active site of the enzyme.
B) As the substrate binds to the enzyme,either or both molecules change shape slightly.
C) The distortion of the shape of the substrate may be a factor in catalyzing the reaction.
D) After the products are released,the enzyme returns to its original shape.
E) The substrate and enzyme bind irreversibly.

F) A) and B)
G) A) and C)

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Which of the following make up the three components of a nucleotide? (i) Nitrogen base (ii) Sugar (iii) Phosphate group (iv) Amino acid (v) Steroid


A) i,ii,and iii
B) i,ii,and iv
C) ii,iii,and v
D) ii,iv,and v
E) iii,iv,and v

F) B) and D)
G) None of the above

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Which of the following statements is/are incorrect? (i) Like fats,phospholipids are esters of glycerol (ii) A phospholipid has three fatty acid residues (iii) Phospholipids have a nonpolar head and long,polar tails


A) i only
B) i and ii
C) ii and iii
D) All statements are correct
E) All statements are incorrect

F) B) and E)
G) All of the above

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Which of the following monosaccharides combine to make the disaccharide lactose? (i) glucose (ii) fructose (iii) ribose (iv) galactose


A) i and ii
B) i and iii
C) i and iv
D) ii and iii
E) ii and iv

F) B) and E)
G) C) and D)

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In simple sugars,every carbon but one contains a hydroxyl group; the remaining carbon is double bonded to an oxygen atom as a carbonyl group.What type of sugar has the carbonyl at the end of the carbon chain?


A) Cretose
B) Polysaccharide
C) Disaccharide
D) Aldose
E) Ketose

F) A) and E)
G) C) and E)

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What is the name of the location that binds the enzyme's substrate during the reaction that follows?


A) Disulfide linkage
B) Messenger RNA
C) Substrate binding location
D) Active site
E) Skinner's linkage

F) D) and E)
G) A) and B)

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Which of the following statements is correct? (i) The shape and polarity of the active site of an enzyme allows only a few dozen substrate molecules to bind reversibly to the enzyme at a time. (ii) If a substrate remains bound to an enzyme,that enzyme molecule can no longer function as a catalyst. (iii) Military nerve gases are examples of irreversible inhibitors.


A) i only
B) ii only
C) iii only
D) i and ii
E) ii and iii

F) C) and D)
G) A) and B)

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How many different substrate molecules are normally catalyzed by a single enzyme?


A) One
B) Ten
C) One hundred
D) One million
E) 36 million

F) A) and C)
G) None of the above

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Which of the following statements is/are incorrect? (i) Fats and oils are mainly esters of long-chain carboxylic acids (ii) Long-chain carboxylic acids are called oily acids (iii) The alcohol part of the ester in fats and oils comes from a dihydroxyl alcohol


A) i only
B) ii only
C) iii only
D) i and ii
E) ii and iii

F) C) and D)
G) B) and C)

Correct Answer

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Which of the following bases is not found in RNA?


A) Thymine
B) Guanine
C) Cytosine
D) Uracil
E) Adenine

F) A) and E)
G) A) and C)

Correct Answer

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Which of the following is the best definition of the term protein?


A) The class of polymeric molecules with molar masses from about 5,000 g/mole on up
B) An amino acid polymer typically containing more than 40 amino acids
C) A chemical compound formed by bonding two or more monomers
D) A compound consisting of a carbonyl group bonded to a hydrogen on one side and a hydrogen,alkyl,or aryl group on the other
E) A carboxylic acid containing both an amine group and a variable alkyl group

F) C) and E)
G) A) and B)

Correct Answer

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Which of the following is classified as a lipid? (i) fats (ii) oils (iii) waxes (iv) steroids


A) i only
B) ii only
C) iii only
D) iv only
E) All are lipids

F) B) and D)
G) A) and E)

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Which of the following statements is/are correct? (i) Some waxes are esters of fatty acids with an alcohol portion that is a monohydroxyl alcohol with a long carbon chain (ii) Some waxes serve as a water-resistant coating on skin,fur,and feathers,but most waxes are structural (iii) The general structure for many waxes is that of an ether


A) i only
B) i and ii
C) i and iii
D) ii and iii
E) i,ii,and iii

F) A) and D)
G) B) and C)

Correct Answer

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What molecular structure is shown below? What molecular structure is shown below? A) Thymine B) Adenine C) Cytosine D) Uracil E) Guanine


A) Thymine
B) Adenine
C) Cytosine
D) Uracil
E) Guanine

F) B) and E)
G) All of the above

Correct Answer

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Which of the following bases is not found in DNA?


A) Thymine
B) Guanine
C) Cytosine
D) Uracil
E) Adenine

F) All of the above
G) B) and E)

Correct Answer

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Consider the following amino acid structures: Consider the following amino acid structures: Glycine alanine serine Identify the C-terminal acid and the N-terminal acid in the following dipeptide: C-terminal acid N-terminal acid A) glycine alanine B) glycine serine C) alanine serine D) alanine glycine E) serine glycine Consider the following amino acid structures: Glycine alanine serine Identify the C-terminal acid and the N-terminal acid in the following dipeptide: C-terminal acid N-terminal acid A) glycine alanine B) glycine serine C) alanine serine D) alanine glycine E) serine glycine Consider the following amino acid structures: Glycine alanine serine Identify the C-terminal acid and the N-terminal acid in the following dipeptide: C-terminal acid N-terminal acid A) glycine alanine B) glycine serine C) alanine serine D) alanine glycine E) serine glycine Glycine alanine serine Identify the C-terminal acid and the N-terminal acid in the following dipeptide: Consider the following amino acid structures: Glycine alanine serine Identify the C-terminal acid and the N-terminal acid in the following dipeptide: C-terminal acid N-terminal acid A) glycine alanine B) glycine serine C) alanine serine D) alanine glycine E) serine glycine C-terminal acid N-terminal acid


A) glycine alanine
B) glycine serine
C) alanine serine
D) alanine glycine
E) serine glycine

F) B) and E)
G) A) and B)

Correct Answer

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