Proteins

What is a peptide bond?

• Bond that holds two amino acids together.

• A bond that holds hydrogen and oxygen molecules together.

• A bond that holds the phosphate group of one nucleotide and a sugar of a neighboring nucleotide.

• A bond that is formed by the sharing of electrons.

How many different amino acids are there?

• 15
• 20
• 25
• 30

What is the monomer of proteins?

• amino acids
• polypeptides
• nucleotides
• monosaccharides

Enzymes are capable of increasing the rate of a chemical reaction within a living cell.  Enzymes accomplish this through which of the following means?

• reducing the number of products   
• reducing the activation energy
• increasing the temperature of the cell
• increasing the concentration of reactants 

Given the graph below, which statement best describes the role of enzymes?

• More energy is released without the presence of enzymes
• Less energy is needed to start a reaction when enzymes are present.
• A reaction is catalyzed by the lack of enzymes
• The presence of enzymes causes reactions to occur at a slower rate.

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

• True
• False

When a protein unfolds, it is

• Denatured
• Building
• Adding amino acids
• Making food

What conditions usually do not cause denaturation?

• Extreme heat

• Extreme pH

• Dissolving in water

• Toxicity

The primary sequence of a protein refers to the:

• Order of amino acids
• α-Helix or β-Pleated Sheet
• Interaction of subunits
• Hydrogen Bonding

The sequence of amino acids is determined by:

• Genes
• Hydrogen Bonds
• Like Dissolves Like
• pH