Importance of Energy for Life

What does entropy represent in the universe?

• The universe becoming more ordered

• The universe staying the same

• The universe becoming more random or less ordered

• The universe shrinking in size

What is required to build something complex in a living cell?

• Decreased entropy

• Increased entropy

• Energy

• Water

What happens to entropy as a cell grows and builds complex molecules?

• Entropy increases

• Entropy stays the same

• Entropy decreases

• Entropy is not affected

What type of biochemical reactions capture energy from light?

• Chemosynthesis

• Fermentation

• Phototrophy

• Glycolysis

What are autotrophs capable of doing?

• Consuming organic molecules from other organisms

• Forming all their own organic molecules from CO₂ and minerals

• Breaking down glucose to release energy

• Absorbing nutrients from the soil

What is the chemical equation for photosynthesis as shown in the image?

• 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

• C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

• 6O₂ + C₆H₁₂O₆ → 6CO₂ + 6H₂O

• 6CO₂ + C₆H₁₂O₆ → 6O₂ + 6H₂O

What are chemotrophic reactions?

• Reactions that yield energy from sunlight

• Reactions that yield energy stored in chemical bonds of molecules such as biomass of a consumed prey organism

• Reactions that do not yield energy

• Reactions that only occur in the presence of oxygen

Which of the following are included in chemotrophy?

• Phototrophy and lithotrophy

• Organotrophy and phototrophy

• Organotrophy and lithotrophy

• Phototrophy and autotrophy

What defines organotrophy and lithotrophy?

• Their ability to use sunlight

• Their use of carbon dioxide

• Their electron donors and acceptors

• Their consumption of organic food

What is organotrophy in the context of metabolic reactions that yield energy?

• Metabolism in which the electron donors are inorganic

• Metabolism in which the food molecules are not required

• Metabolism in which the electron donors are organic

• Metabolism that does not involve heterotrophs