AP Biology Unit 3 Review

Which of the following would NOT affect the function of an enzyme?

• Change in temperature

• Change in pH

• Adding water

• Change in salinity

An enzyme has a competitive inhibitor covalently bonded to its active site. What would be true about this enzyme?

• Increasing the substrate concentration will improve enzyme function

• The enzyme is irreversibly inactivated by the covalent bonding of the inhibitor

• Increasing enzyme concentration will increase enzyme function

• Changing the coenzyme will increase the activity of the enzyme

Answer explanation

When a competitive inhibitor covalently binds to the active site of an enzyme, it is irreversibly inhibited.

Which of the following statements about coenzymes is NOT true?

• Coenzymes are small, nonprotein molecules

• Coenzymes are organic molecules

• Coenzymes are inorganic molecules such as metal ions

• Coenzymes are often vitamins

What type of reaction breaks down a macromolecule such as starch into smaller glucose molecules?

• Catabolic reaction

• Anabolic reaction

• Kinetic reaction

• Metabolic reaction

Answer explanation

Catabolic reactions break down larger molecules into simpler ones, and releases energy. Anabolic reactions build up complex molecules and require the input of energy.

What is true of the reaction shown in the image?

• Adding more enzyme will increase the reaction rate

• Adding more substrate will increase the reaction rate

• Increasing the temperature will increase the reaction rate

• Increasing the pH will increase the reaction rate

What organelle produces hydrogen peroxide when performing its cellular reactions?

• Mitochondria

• Lysosome

• Peroxisome

• Golgi apparatus

Which statement about ATP is true?

• Energy is released for cellular work when the bond is broken between the second and third phosphates

• Energy is required to break the bonds between the phosphates

• It is made up of adenine, deoxyribose and 3 phosphates

• The bond between the sugar and the phosphates is a high energy bond

Tags

NGSS.HS-LS1-7

What are the reactants for photosynthesis?

• carbon dioxide and oxygen

• carbon dioxide and water

• oxygen and glucose

• ATP and carbon dioxide

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

How do enzymes catalyze reactions?

• They slow down the movement of molecules

• They are consumed in the reaction

• They lower the activation energy

• They raise the activation energy

Tags

NGSS.HS-PS1-5

Which statement about photosynthesis is true?

• The light reactions produce ATP and NADPH that are used in the Calvin cycle

• The Calvin cycle produces G3P

• The Calvin cycle produces NAD+ and ADP that are then used in the light reactions

• All of these statements are true

Tags

NGSS.HS-LS1-5