Question 1

Although the hydroxyl groups in serine and threonine are uncharged, they can react within active sites of some enzymes .

Accepted Answer

A)  precisely because they are uncharged 
B)  because the hydroxyl group is polar 
C)  because the hydroxyl group is small and fits into the site 
D)  All of the above 
A)  precisely because they are uncharged 
B)  because the hydroxyl group is polar 
C)  because the hydroxyl group is small and fits into the site 
D)  All of the above

Question 2

Cystine is likely to be isolated from proteins that are

Accepted Answer

A)  high in methionine. 
B)  high in peptide-linked cysteine. 
C)  intracellular. 
D)  extracellular. 
A)  high in methionine. 
B)  high in peptide-linked cysteine. 
C)  intracellular. 
D)  extracellular.

Question 3

Even though mass spectrometry has been in use for over a hundred years, it had only limited use with proteins until the 1980ʹs because

Accepted Answer

A)  not many proteins had been discovered and purified before the 1980ʹs. 
B)  it was not possible to disperse charged proteins into a gaseous stream of particles. 
C)  many proteins are difficult or impossible to crystallize. 
D)  proteins decompose too quickly into their component amino acids. 
A)  not many proteins had been discovered and purified before the 1980ʹs. 
B)  it was not possible to disperse charged proteins into a gaseous stream of particles. 
C)  many proteins are difficult or impossible to crystallize. 
D)  proteins decompose too quickly into their component amino acids.

Question 4

A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of

Accepted Answer

A)  arginine. 
B)  glycine. 
C)  proline. 
D)  leucine or isoleucine. 
A)  arginine. 
B)  glycine. 
C)  proline. 
D)  leucine or isoleucine.

Question 5

Basic amino acids are positive, negative at pH 7 and acidic R group amino acids are positive, negative at pH 7.

Accepted Answer

A)  negative; positive 
B)  negative; negative 
C)  positive; negative 
D)  positive; positive 
A)  negative; positive 
B)  negative; negative 
C)  positive; negative 
D)  positive; positive

Although the hydroxyl groups in serine and threonine are uncharged, they can react within active sites of some enzymes .

Cystine is likely to be isolated from proteins that are

Even though mass spectrometry has been in use for over a hundred years, it had only limited use with proteins until the 1980ʹs because

A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of

Basic amino acids are positive, negative at pH 7 and acidic R group amino acids are positive, negative at pH 7.

Introduction to Biochemistry

Water

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

Dna Replication, Repair, and Recombination

Transcription and Rna Processing

Protein Synthesis

Recombinant Dna Technology

Filters

Exam 3: Amino Acids and the Primary Structures of Proteins

Although the hydroxyl groups in serine and threonine are uncharged, they can react within active sites of some enzymes .

Cystine is likely to be isolated from proteins that are

Even though mass spectrometry has been in use for over a hundred years, it had only limited use with proteins until the 1980ʹs because

A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of

Basic amino acids are positive, negative at pH 7 and acidic R group amino acids are positive, negative at pH 7.

Introduction to Biochemistry

Water

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

Dna Replication, Repair, and Recombination

Transcription and Rna Processing

Protein Synthesis

Recombinant Dna Technology

Filters