Biological Proteins: An Introduction

Proteins are polymers of _____.

• a.amino acids
• b.disulfide bridges
• c.glucose
• d.peptide bonds

A bond between amino acids is called a(n) _____ bond.

• a.acid
• b.hydrogen
• c.ionic
• d.peptide

Disulfide bridges in proteins help hold them together.

• a.true
• b.false

To separate individual amino acids in a protein, scientists can:

• a.Add a basic solution (pH greater than 7) to break the peptide bonds.
• b.Add an acidic solution (pH less than 7) to break the peptide bonds.
• c.Pass X-rays through the various proteins to break the peptide bonds.
• d.Use electrophoresis to break the peptide bonds.

What research techniques did Frederick Sanger use to identify the proteins and amino acids in insulin?

• a.Electrophoresis and alpha-sheets
• b.Chromatography and alpha-sheets
• c.Electrophoresis and chromatography
• d.None of the above

An amino acid that is water soluble is called _____.

• a.a beta-sheet
• b.an alpha helix
• c.hydrophobic
• d.hydrophilic

All proteins have a Quaternary structure.

• a.false
• b.true

The human body contains an estimated _____ proteins that form based on the way _____ amino acids can combine.

• a.20; 100,000
• b.100,000; 20
• c.100; 20
• d.100,000; 70