Chapter 18

Chapter 18

Open Ended

What are the 4 classes of biomolecules?

Open Ended

What is an example of a protein that is used for structure and support?

Open Ended

What is an example of a protein that is a hormone?

Open Ended

What are the 3 parts of an amino acid?

Multiple Choice

Which amino acid is a secondary amine whose N and C are connected in a ring?

• phenylalanine

• glycine

• proline

• valine

Multiple Choice

All 20 amino acids are achiral except for glycine (T or F)

• True

• False

Multiple Choice

Zwitterions give amino acids the physical properties of which substance?

• H2O

• salts

• a base

Fill in the Blanks

The isoelectric point is the pH at which an amino acid has equal___and___

Multiple Choice

What is a peptide bond?

• amide bond that links 2 AAs

• amine bond that links 2 AAs

Open Ended

What is the name of a very large amino acid? (there are 2 names)

Multiple Choice

Does nature select L or D enantiomers for making proteins?

• L

• D

Multiple Select

Which kinds of amino acids are hydrophilic?

• Nonpolar neutral

• Polar neutral

• Acidic

• Basic

Nonpolar neutral

• Alanine (Ala)

• Glycine (Gly)

• Isoleucine (Ile)

• Leucine (Leu)

• Methionine (Met)

• Phenylalanine (Phe), Valine (Val)

• Proline (Pro), Tryptophan (Trp)

Polar neutral

• Asparagine (Asn)

• Cysteine (Cys)

• Glutamine (Gln)

• Serine (Ser)

• Threonine (Thr)

• Tyrosine (Tyr)

Acidic

• Aspartic acid (Aspartate)

• Glutamic acid (Glutamate)

Basic

• Arginine (Arg)

• Histidine (His)

• Lysine (Lys)

Multiple Choice

Which amino acid is hydrophilic?

• Isoleucine

• Phenylalanine

• Aspartic acid

Multiple Choice

Which amino acid is hydrophobic?

• Glutamic acid

• Tryptophan

• Arginine