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Experiment #9: Amines, Amino Acids, And Proteins

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

TERMINOLOGY: Proteins with 1 peptide chain

Back (Answer)

Monomeric Proteins

#2
Front (Question)

* TERMINOLOGY: Proteins with more than 1 polypeptide chain

Back (Answer)

Multimeric Proteins

#3
Front (Question)

TERMINOLOGY: Only one kind of polypeptide

Back (Answer)

Homomultimeric

#4
Front (Question)

TERMINOLOGY: Several different kinds of polypeptide chains

Back (Answer)

Heteromultimeric

#5
Front (Question)

TERMINOLOGY: Each amino acid in a peptide

Back (Answer)

Moiety or Residue

#6
Front (Question)

TERMINOLOGY: The residue having a free alpha amino group

Back (Answer)

n-terminal residue

#7
Front (Question)

TERMINOLOGY: The residue having a free carboxyl group

Back (Answer)

c-terminal residue

#8
Front (Question)

SOLUBILITY OF AMINES IN WATER: Small aliphathic amines whose carbon atoms are less than ________ are water soluble and their solutions gave a ____________ (ph less than 7) when tested with litmus paper

Back (Answer)

• less than 5 • basic response

#9
Front (Question)

TRUE OR FALSE: Solubility of Amines in Water: As the number of C atom increase, solubility decreases

Back (Answer)

TRUE

#10
Front (Question)

TRUE OR FALSE: Solubility of Amines in Water: Although most amines are not water soluble, amine salts are generally water soluble

Back (Answer)

TRUE

#11
Front (Question)

TRUE OR FALSE: Solubility of Amines in Water: The more substituted or larger is the nonpolar group, the more soluble

Back (Answer)

FALSE; the more substituted/larger the nonpolar group, the less soluble

#12
Front (Question)

TRUE OR FALSE: Solubility of Amines in Water: The more substituted the compound is, the more basic

Back (Answer)

TRUE

#13
Front (Question)

IDENTIFICATION: Solubility of Amines in Aqueous Acid: Amines react with acids forming ____________________ ?

Back (Answer)

positively charged quaternary amines

#14
Front (Question)

Generally used to detect the presence of free alpha amino groups in amino acids, polypeptides, and proteins

Back (Answer)

Ninhydrin Test

#15
Front (Question)

What is the reagent for Ninhydrin Test?

Back (Answer)

Ninhydrin Solution

#16
Front (Question)

What is the positive result for Ninhydrin Test?

Back (Answer)

Appearance of blue to violet colored spots

#17
Front (Question)

The test is used to detect the presence of two or more peptide linkage in proteins and their larger hydrolytic products (proteoses and peptones)

Back (Answer)

Biuret Test

#18
Front (Question)

What is the reagent of Biuret Test?

Back (Answer)

Alkaline Copper (II) Sulfate

#19
Front (Question)

What is the positive result for Biuret Test?

Back (Answer)

Formation of violet-colored coordination complex due to the coordination of cuptic ions with the unshared electron pairs of the peptide

#20
Front (Question)

What is the reagent for Reaction with Lead Acetate?

Back (Answer)

NaOH/Pb (CH3COO2)

#21
Front (Question)

It is a test where the sulfur in sulfur-containing proteins and amino acids can be released as sulfides by the action of strong alkali

Back (Answer)

Reaction with Lead Acetate

#22
Front (Question)

TRUE OR FALSE: In Reaction with Lead Acetate, the sulfides can be precipitated by lead acetate

Back (Answer)

TRUE

#23
Front (Question)

It is associated with the alteration of the secondary and tertiary structures of biological proteins which results in changes in physical properties and loss of biological activity

Back (Answer)

Protein Denaturation

#24
Front (Question)

TRUE OR FALSE: Amines are readily protonated by weak acids

Back (Answer)

FALSE; it is readily protonated by strong acids