Biology Essentials: Free Energy

Mr. Anderson discusses the concept of free energy, its sources, and its critical role in life processes. He explains how organisms utilize energy through metabolism, focusing on glycolysis. The video also covers the laws of thermodynamics and their relation to evolution, emphasizing that Earth is an open system. The importance of energy for growth, reproduction, and maintaining homeostasis is highlighted, along with the consequences of energy disruptions on ecosystems, using Easter Island as an example.

What is the primary source of free energy for life on Earth?

• The Moon

• The Sun

• The Earth's core

• The ocean

Which process is responsible for the sum of all chemical reactions in the body?

• Metabolism

• Photosynthesis

• Digestion

• Respiration

What is the relationship between metabolism and body size?

• Larger organisms have higher metabolism

• Smaller organisms have lower metabolism

• Metabolism is not related to body size

• Larger organisms have lower metabolism

According to the first law of thermodynamics, energy can be:

• Neither created nor destroyed

• Created and destroyed

• Only created

• Only destroyed

What does the second law of thermodynamics state about entropy?

• Entropy increases over time

• Entropy is irrelevant to energy conversion

• Entropy remains constant

• Entropy decreases over time

What is glycolysis primarily responsible for?

• Producing oxygen

• Synthesizing lipids

• Breaking down glucose

• Breaking down proteins

Which sugar can enter the glycolysis pathway at the glucose 6 phosphate stage?

• Sucrose

• Maltose

• Lactose

• Galactose

What happens if there is a disruption in the free energy available to an organism?

• The organism grows faster

• The organism may die

• The organism becomes more active

• The organism becomes immune to diseases

What was a major consequence of deforestation on Easter Island?

• Increased population

• Improved agriculture

• Population collapse

• Technological advancement

How do ectotherms like turtles regulate their body temperature?

• Internally through metabolism

• By using their external environment

• By constant movement

• Through hibernation