Protein Structure and Amino Acids Quiz

How many standard amino acids are there?

• 18

• 20

• 22

• No correct response

How do the various standard amino acids differ from each other?

• In the location of the amino group

• In the location of the carboxyl group

• In the identity of the R group (side chain)

• No correct response

The number of carboxyl groups and amino groups present, respectively in a nonpolar amino acid is __________.

• 1 and 1

• 2 and 1

• 1 and 2

• No correct response

How many different subclassifications are there for polar amino acids?

• 2

• 3

• 4

• No correct response

Which of the following statements concerning elements present in standard amino acids is correct?

• Some, but not all of them, contain N.

• Some, but not all of them, contain O.

• Some, but not all of them, contain S.

• No correct response

How many of the standard amino acids are classified as essential amino acids for adults?

• 7

• 9

• 15

• No correct response

Proteins from plant sources are _________________.

• Always complete dietary protein

• Frequently complete dietary protein

• Seldom complete dietary protein

• No correct response

Incomplete dietary proteins contain in adequate amounts of ________________.

• One or more essential amino acids

• One or more nonessential amino acids

• At least one essential and one nonessential amino acid

• No correct response

Which of the following statements concerning the handedness of standard amino acids found in proteins is correct?

• All of them exhibit handedness

• All except one of them exhibit handedness

• All except two of them exhibit handedness

• No correct response

Which of the following groups is positioned at the top of the Fischer projection formula for a standard amino acid?

• -COOH group

• -COOH group

• -NH2 group

• No correct response