AS Biology Revision

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 

Which factors can change the shape of an enzyme and thus denatures a enzyme?

• Excessive heat and changes in pH
• Nothing can
• Exposure to light and sound
• Exposure to bacteria and Amoebas

Based on the graph, what temperature does this enzyme work best? 

• 15 C
• 40 C
• 30 C

Which line represents an enzyme-catalyzed reaction? 

• Line 1
• Line 2

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.

What is a protein: 

• A polymer composed of many sugars.
• A polymer composed of many amino acids. 
• A polymer composed of fatty acids. 
• A polymer composed of nucleotides. 

The element _______is found in all of the organic compounds.

• Iron

• Carbon

• Nitrogen

• Oxygen

The main function of a carbohydrate is

• long term energy storage

• stores genetic information

• short term energy storage

• regulates and controls all body proccesses

Carbohydrates are made of what elements?

• CHO

• CHON

• CHONP

• CHONS

What molecule is this

• sucrose
• protein
• glucose
• cellulose