7. Energy and Metabolism

Introduction to Energy

Where does energy come from? - George Zaidan and Charles Morton

A guide to the energy of the Earth - Joshua M. Sneideman

Thermodynamics: System vs. Surroundings

 The metabolism of an organism is isolated from its surroundings. 

 Because energy must be conserved, organisms constantly recycle energy and thus need no input of energy. 

 No. Energy is conserved, but utilization of energy by organisms requires that some energy be lost as heat. This energy must be replaced by new energy from the environment. 

 Heat produced by the organism is conserved in the organism and not lost to the environment. 

 No. This would describe a closed system; organisms constantly lose heat to their environment as a consequence of being open systems. 

 All of the listed responses are correct. 

 No. Only one of the choices is correct. 

 Organisms acquire energy from and lose energy to their surroundings. 

Consider how an organism interacts with its environment.

Organisms are described as thermodynamically open systems. Which of the following statements is consistent with this description?

When the temperature of a substance rises causing the molecules of that substance to move faster.

When a hockey puck slides across the ice after being hit by a player.

When glucose molecules are broken down to create energy for cellular work.

When the molecules of the air vibrate transmitting soundwaves.

Which of the following is NOT a form of kinetic energy?a) When the temperature of a substance rises causing the molecules of that substance to move faster.b) When a hockey puck slides across the ice after being hit by a player.c) When glucose molecules are broken down to create energy for cellular work.d) When the molecules of the air vibrate transmitting soundwaves.

Most cells cannot harness heat to perform work because
a. heat does not involve a transfer of energy.
b. cells do not have much thermal energy; they are relatively cool.
c. temperature is usually uniform throughout a cell.
d. heat can never be used to do work.

Animation: Energy Transformations

A coral reef where energy and mass both enter and exit. 

The digestive system of an organism absorbing food energy and discarding food waste.

The universe where the amount of energy and mass is constant.

Which of the following is NOT an example of a biological system?a) A human eating a cheeseburger.b) A coral reef where energy and mass both enter and exit.c) The digestive system of an organism absorbing food energy and discarding food waste.d) The universe where the amount of energy and mass is constant.

World's Most Asked Questions: What Is Energy?

Overview of energy metabolism

The principles of thermodynamics govern the chemical processes in all biological organisms.

The principles of thermodynamics govern how an organism exchanges energy with their environment.

The principles of thermodynamics govern how all life on Earth exchanges energy.

Why are the principles of thermodynamics important for the study of biology?a) The principles of thermodynamics govern the chemical processes in all biological organisms.b) The principles of thermodynamics govern how an organism exchanges energy with their environment.c) The principles of thermodynamics govern how all life on Earth exchanges energy.d) All of the above.

A spring being released and expanding rapidly.

An ant foraging (moving around) for food.

Which of the following is an example of potential energy?a) Water rushing over a water fall.b) A glucose molecule.c) A spring being released and expanding rapidly.d) An ant foraging (moving around) for food.

What is Energy?

What is energy? | Introduction to energy | High school physics | Khan Academy

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1. Introduction to Biology

2. Chemistry

3. Water

4. Biomolecules

5. Cell Components

6. The Membrane

8. Respiration

9. Photosynthesis

10. Cell Signaling

11. Cell Division

12. Meiosis

13. Mendelian Genetics

14. DNA Synthesis

15. Gene Expression

16. Regulation of Expression

17. Viruses

18. Biotechnology

19. Genomics

20. Development

21. Evolution by Natural Selection

22. Evolution of Populations

23. Speciation

24. History of Life on Earth

25. Phylogeny

26. Prokaryotes

27. Protists

28. Plants

29. Fungi

30. Overview of Animals

31. Invertebrates

32. Vertebrates

33. Plant Anatomy

34. Vascular Plant Transport

35. Soil

36. Plant Reproduction

37. Plant Sensation and Response

38. Animal Form and Function

39. Digestive System

40. Circulatory System

41. Immune System

42. Osmoregulation and Excretion

43. Endocrine System

44. Animal Reproduction

45. Nervous System

46. Sensory Systems

47. Muscle Systems

48. Ecology

49. Animal Behavior

50. Population Ecology

51. Community Ecology

52. Ecosystems

53. Conservation Biology

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