Protein Structure

Amino acids share a common structure. The part of the amino acid responsible for the functionality of the protein is the

• Alpha Carbon

• Amino Group

• Carboxyl Group

• Side Chain (R)

• Hydrogen Atom

Hydrophobic or Nonpolar Side Chains tend to

• form barriers along the outside of the protein

• fold inward during folding when placed in aqueous environments

• be involved in forming active sites

Tertiary protein structures are mainly stabilized by

• Hydrogen Bonds

• DiSulfide Bridges

• Covalent Bonds

• All of the Above

The tertiary structure of a protein is the

• bonding together of several polypeptide chains by weak bonds.

• order in which amino acids are joined in a polypeptide chain.

• unique three-dimensional shape of the fully folded polypeptide.

• organization of a polypeptide chain into an α helix or β pleated sheet.

An example of a structural protein is

• Insulin

• Actin

• Myosin

• Keratin

The two types of secondary structures are

• Alpha Pleated Sheet, Beta Helix

• Alpha Helix, Beta Pleated Sheet

• Polypeptide, Globular Protein

• Fibrous, Globular

There are a total of

• 12 Amino Acids

• 64 Amino Acids

• 24 Amino Acids

• 20 Amino Acids

The bonding of two amino acid molecules to form a larger molecule requires which of the following?

• Addition of a water molecule

• Removal of a water molecule

• Addition of a glycosidic bond

• Formation of a hydrogen bond

Upon chemical analysis, a particular polypeptide was found to contain 100 amino acids. How many peptide bonds are present in this protein?

• 100

• 99

• 101

• 50

Extension Question: Misfolding of polypeptides is a serious problem in cells. Which of the following diseases are associated with an accumulation of misfolded polypeptides?

• Cancer

• Eczema

• Diabetes

• Alzheimers