Proteins and Nucleic Acids

What kind of bond holds two amino acids together?

• Peptide bond

• Hydrogen bond

• Ionic bond

• Polar bond

How many different amino acids are there?

• 15
• 20
• 25
• 30

Enyzmes are a very important type of protein used to:

• Build bones in skeleton
• Send hormonal signals throughout body
• Speed up chemical reactions
• Photosynthesize glucose in plants

What is a polymer of amino acids called?

• Polysaccharide

• Polypeptide

• Nucleic acid

• Triglyceride

The structure of proteins can be changed by environmental factors such as temperature or pH.

• True
• False

Amino acids that must be supplied by foods in the diet are called:

• essential amino acid
• complete protein
• emulsion
• collagen

Cells must produce many different enzymes because:

• enzymes are quickly used up
• most cellular reactions require a specific, unique enzyme
• They have to have some way to use up the protein that they consume
• enzymes are not very effective at breaking down other proteins

A folded string of amino acids is called a(n):

• Polypeptide
• Polysaccharide

• Protein

• Polynucleotides

What elements make up amino acids?

• Carbon (C), hydrogen (H) and oxygen (O)

• Carbon (C), hydrogen (H), oxygen (O), and nitrogen (N)

• Carbon (C), hydrogen (H) and phosphorus (P)

• Carbon (C), hydrogen (H), nitrogen (N), oxygen (O), and sometimes also sulfur (S)

An example of a nucleic acid is

• Hemoglobin

• RNA

• Glucose

• Olive OIl