Question 1

Which of the following amino acids contains a benzene ring as part of its side chain?

Accepted Answer

Phenylalanine

Question 2

What is the distinguishing functional group present in the side chain of tyrosine compared to phenylalanine?

Accepted Answer

A hydroxyl group $$-OH$$

Question 3

Which aromatic amino acid has a side chain that includes an indole ring structure?

Accepted Answer

Tryptophan

Question 4

Given the structures, which amino acid is described as 'Ala with a phenyl group'?

Accepted Answer

Phenylalanine

Question 5

Which of the following statements about aromatic amino acids is TRUE?

Accepted Answer

Tryptophan contains a nitrogen atom in its aromatic ring system.

Question 6

Which amino acid can participate in hydrogen bonding due to its side chain structure?

Accepted Answer

Tyrosine

Question 7

If a mutation replaces a phenylalanine residue with a tyrosine in a protein, what is the most likely effect on the protein's properties?

Accepted Answer

The protein may gain the ability to form hydrogen bonds at that position.

Question 8

Which of the following is the correct structure for the side chain (R-group) of tryptophan?

Accepted Answer

$$CH_2$$ attached to an indole ring

Question 9

Which aromatic amino acid is most likely to be involved in enzyme active sites due to its ability to donate and accept hydrogen bonds?

Accepted Answer

Tyrosine

Question 10

A protein is found to absorb strongly at 280 nm. Which amino acids are most likely responsible for this property?

Accepted Answer

Tyrosine and Tryptophan

Question 11

Which of the following best describes the difference between the aromatic rings in phenylalanine and tryptophan?

Accepted Answer

Phenylalanine has a benzene ring, while tryptophan has an indole ring containing nitrogen.

Question 12

Which amino acid is most likely to be found in the hydrophobic core of a protein due to its nonpolar aromatic side chain?

Accepted Answer

Phenylalanine

Question 13

Which of the following is NOT a property shared by all aromatic amino acids?

Accepted Answer

Presence of a hydroxyl group on the aromatic ring

Question 14

Which amino acid is described as 'tripping on a tripod' due to its unique ring structure?

Accepted Answer

Tryptophan

Question 15

What is the mnemonic used to remember the aromatic amino acids?

Accepted Answer

FYW: Eat Young Whippersnappers

Question 16

Which of the following amino acids has a side chain that can be phosphorylated?

Accepted Answer

Tyrosine

Question 17

A mutation in a gene results in the substitution of tryptophan for phenylalanine. Which of the following changes is most likely to occur in the protein?

Accepted Answer

Introduction of a nitrogen atom into the aromatic side chain

Question 18

Which of the following is the correct general structure for an amino acid?

Accepted Answer

$$H_2N-CHR-COOH$$

Question 19

Which aromatic amino acid is most likely to be involved in stacking interactions within a protein structure?

Accepted Answer

Phenylalanine

Question 20

Which of the following statements about the nitrogen atom in tryptophan's side chain is correct?

Accepted Answer

The nitrogen is part of the indole ring and not part of the benzene.

Aromatic Amino Acids: Structure and Properties

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