Proteins, Amino Acids, and Peptides Objectives Quiz

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What are the monomer units of proteins?

Carbohydrates

Amino acids (correct)

Fatty acids

Nucleotides

Which functional groups do amino acids contain?

Hydroxyl and ester groups

Aldehyde and ketone groups

Phosphate and sulfhydryl groups

Amino and carboxyl groups (correct)

How many standard amino acids are there in nature that repeatedly occur in proteins?

50

5

30

20 (correct)

Which end of an amino acid is acidic?

Carboxyl end Signup and view all the answers

What type of amino acids are most commonly found in proteins?

Alpha-L amino acids Signup and view all the answers

What are the building blocks of proteins?

Amino acids Signup and view all the answers

What is the general structure shared by all amino acids?

Amino group and a carboxyl group bonded to the same carbon atom Signup and view all the answers

Which property is true for all amino acids?

Chiral except glycine Signup and view all the answers

At what pH do amino acids exist in a zwitterionic state?

Isoelectric point (pI) Signup and view all the answers

How many amino acids are chiral, excluding glycine?

All of them Signup and view all the answers

What classification scheme for amino acids can be based on?

Properties of their side chains Signup and view all the answers

What property is shared by all amino acids?

High melting points Signup and view all the answers

Which group of amino acids contains non-polar aliphatic side chains?

Glycine, alanine, leucine Signup and view all the answers

Which amino acid is considered both basic and aromatic?

Histidine Signup and view all the answers

Among the following, which amino acid is sulfur-containing?

Methionine Signup and view all the answers

Which amino acid is classified as an imino acid?

Proline Signup and view all the answers

Which group of amino acids contains hydroxyl (-OH) groups?

Serine, threonine, tyrosine Signup and view all the answers

'Glutamic and aspartic acids have amide derivatives known as'...?

Glutamine and asparagine Signup and view all the answers