Unit 5 Test review Enzymes and Energy

Which statement below is true about the enzyme activity from the graph?

• A) The pH of some enzymes changes as the temperature changes

• B) A neutral pH is always optimal for enzyme activity

• C) Enzyme activity causes acids to change into bases over time

• D) Different pH levels can change enzyme activity

Which part of the enzyme molecule does the substrate fit into?

• Coenzyme

• Polypeptide

• Active site

• Membrane

Fill in the blank: Enzymes ______ the activation energy required for a chemical reaction to occur.

• increase

• decrease

• do not affect

What is the best reason to explain why the action of the enzyme decreased after 40 degrees Celsius?

• The DNA in the enzyme mutated and can no longer break down starch

• Denaturation caused the shape of the enzyme to change due to increased temperatures

• The increased temperature changed the pH of the environment, which caused it to work more slowly

• The enzymes died after working for a long period of constant activity in the body

Tags

NGSS.HS-PS3-4

Fill in the blank: Enzymes are proteins that function as _______ in biological reactions.

• inhibitors

• catalysts

• substrates

• products

According to the line graph, what is the optimum (best) temperature for the enzyme to function?

• 50°C

• 10°C

• 40°C

• 20°C

• 30°C

Which biological process is represented in this diagram?

• Cellular respiration

• DNA replication

• Digestion

• Photosynthesis

Tags

NGSS.HS-LS1-7

In the human body, muscle cells have an increased need for energy during exercise. To help supply this energy, the body will immediately increase

• Nervous system activity to stimulate the intake of carbon dioxide

• The breathing rate to provide more oxygen for respiration

• Food intake to increase carbohydrates available for respiration

• The need for waste products to be retained

Tags

NGSS.HS-LS1-7

Almost all of the energy used by organisms on earth originally comes from --

• Water

• Oxygen

• Sunlight

• Grass

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

During periods of hot, dry weather, the stomata close. Which of the following is the best explanation of why this occurs?

• This helps maintain homeostasis by preventing too much water from escaping

• This increases glucose production

• This increases photosynthesis by taking in more carbon dioxide

• This does not actually happen in plants

Tags

NGSS.HS-LS1-3