Cellular Energy and Metabolism

These flashcards cover key vocabulary and concepts related to cellular energy, metabolism, and the laws of thermodynamics.

1. Cellular Energy

The energy produced and utilized by cells to perform biological functions.

2. Photosynthesis

The process by which plants convert light energy into chemical energy in the form of glucose.

3. Cellular Respiration

The metabolic process in which organic molecules are broken down to release energy for use by the cell.

4. Autotrophs

Organisms that produce their own food, using inorganic substances or light energy.

5. Heterotrophs

Organisms that cannot produce their own food and must obtain energy from eating other organisms.

6. ATP (Adenosine triphosphate)

The primary energy carrier in cells, providing energy for various biological processes.

7. ADP (Adenosine diphosphate)

The molecule formed when ATP loses a phosphate group, releasing energy.

8. Catabolism

The set of metabolic pathways that break down molecules into smaller units, releasing energy.

9. Anabolism

The set of metabolic pathways that construct molecules from smaller units, requiring energy.

10. Metabolism

The total of all chemical reactions that occur within an organism, including both catabolic and anabolic pathways.

11. Energy

The ability to do work, essential for sustaining life and facilitating biological processes.

12. First Law of Thermodynamics

Energy cannot be created or destroyed; it can only be transformed from one form to another.

13. Second Law of Thermodynamics

Energy transformations increase the entropy or disorder of a system, leading to a loss of usable energy.

14. Entropy

A measure of disorder or randomness in a system, often increasing during energy transformations.

15. Law of Conservation of Matter

Matter cannot be created or destroyed in a chemical reaction; it only changes form.

16. Chloroplasts

Organelles in plant cells where photosynthesis occurs, converting light energy into chemical energy.

17. Mitochondria

The powerhouse of the cell, where cellular respiration takes place to release energy from food.

18. Glycolysis

The process of breaking down glucose into pyruvate, releasing a small amount of energy.

19. Krebs Cycle

A series of chemical reactions used by all aerobic organisms to generate energy through the breakdown of acetyl-CoA.

20. Light-independent reactions

The part of photosynthesis that does not require light to occur but uses the products from light-dependent reactions.

21. Chemical energy

Energy stored in the bonds of chemical compounds, released during chemical reactions.

22. Energy transformation

The process of changing energy from one form to another, such as light energy to chemical energy.

23. Adenosine

A component of ATP and ADP, consisting of an adenine base bonded to a ribose sugar.

24. Ribose

A five-carbon sugar that is part of the structure of ATP and ADP.

25. Phosphate group

A functional group consisting of a phosphorus atom bonded to four oxygen atoms, crucial in ATP.

26. Metabolic pathways

A series of interconnected biochemical reactions that occur within a cell.

27. Bioenergetics

The study of the transformation of energy in living organisms.

28. Inorganic substances

Compounds that do not contain carbon-hydrogen bonds; used by some autotrophs for energy.

29. Organic compounds

Molecules that contain carbon and are the basis of life; utilized by heterotrophs for energy.

30. Mechanical energy

The energy associated with the motion of an object; derived from chemical energy in muscles.

31. Thermal energy

The energy that comes from the temperature of matter; often a byproduct of energy transformations.

32. Food chain

A linear sequence that shows how energy and nutrients flow through an ecosystem.

33. Trophic levels

Different levels in a food chain, each representing a step in the flow of energy.

34. Energy flow

The transfer of energy through the food chain from autotrophs to heterotrophs.

35. Photosynthesis equation

$$6CO_2 + 6H_2O + ext{light energy} <br /> ightarrow C_6H_{12}O_6 + 6O_2$$

36. Cellular respiration equation

$$C_6H_{12}O_6 + 6O_2 <br /> ightarrow 6CO_2 + 6H_2O + ext{energy (ATP)}$$

37. Coupled reactions

Reactions in which the energy released from one reaction is used to drive another.

38. Sun energy

The primary source of energy for autotrophs, driving photosynthesis.

39. Energy storage

The process by which cells store energy in the form of ATP for later use.

40. Energy release

The process of breaking down ATP to release energy for cellular activities.

41. Glucose importance

Glucose is the primary energy source for cells, derived from photosynthesis.

42. Organic molecules

Molecules that contain carbon, forming the basis of living organisms and their energy metabolism.

43. ATP cycle

The process in which ATP is converted to ADP and back to ATP, involving energy transfer.

44. Energy currency

A term used to describe ATP due to its role in providing usable energy for cellular processes.

45. NADP+

Nicotinamide adenine dinucleotide phosphate, involved in energy storage and transport in photosynthesis.

46. FADH2

Flavin adenine dinucleotide, a carrier of electrons during cellular respiration.

47. Photosynthetic autotrophs

Organisms that perform photosynthesis to produce their own food using sunlight.

48. Chemoautotrophs

Organisms that obtain energy from inorganic chemicals to produce their own food.

49. Ecosystem energy dynamics

The flow of energy through an ecosystem from producers to consumers.

50. Respiration significance

Essential for converting energy stored in food into a form usable by cells.

51. Energy transformation efficiency

The measure of how much energy from one form is converted to another during a process.

52. Energy balance

The relation between energy intake and energy expenditure in an organism.

53. Energy pathway

The series of reactions that lead to energy production from substrates like glucose.

54. Electrons flow in respiration

Electrons move through electron transport chains to release energy during cellular respiration.

55. ATP synthesis

The creation of ATP from ADP and inorganic phosphate during cellular respiration.

56. Energy from food

Energy derived from carbohydrates, fats, and proteins that is used by organisms for metabolic processes.

57. Thermal energy loss

The heat energy released during metabolic reactions, increasing entropy.

58. Energy conservation

The principle that energy in a closed system remains constant and is conserved.

59. ATP hydrolysis

The reaction where ATP is broken down into ADP and phosphate, releasing energy.

60. Protein synthesis

The process by which cells construct proteins using amino acids, driven by energy from ATP.

61. Genetic instructions

The information encoded in DNA that guides cellular functions and processes.

62. Energy requirements of cells

Cells require energy for growth, reproduction, and maintenance of homeostasis.

63. Energy-rich molecules

Molecules like ATP that store high amounts of energy for immediate cellular use.

64. Photosynthesis light reactions

The initial phase of photosynthesis where light energy is converted into chemical energy.

65. Energy carriers

Molecules that transport energy within cells, such as ATP and NADH.

66. Mitochondrial function

Mitochondria are responsible for aerobic respiration and ATP production.

67. Energy input

Energy supplied to a system to drive chemical reactions.

68. Chemical bond energy

Energy stored in the bonds between atoms in a molecule.

69. Biochemical reactions

Chemical processes that occur within living organisms to sustain life.

70. Energy for muscle contraction

Chemical energy from ATP converted to mechanical energy for movement.

71. Energy depletion

The reduction of available energy in a system often due to inefficient energy transformation.

72. Sunlight to chemical energy

The conversion of solar energy into chemical energy through photosynthesis.

73. Enzyme role in metabolism

Enzymes catalyze biochemical reactions, speeding up metabolic processes.

74. Regulation of metabolic pathways

The control of metabolic reactions to maintain homeostasis and energy balance.

75. Energy storage molecules

Molecules like starch and glycogen that store energy for later use.

76. Carbon fixing

The process in photosynthesis where carbon dioxide is incorporated into organic molecules.

77. Light-dependent reactions

The phase of photosynthesis that requires light to produce ATP and NADPH.

78. Photosynthesis products

The products of photosynthesis include glucose (C6H12O6) and oxygen (O2).

79. Cellular respiration by-products

By-products of cellular respiration include carbon dioxide (CO2) and water (H2O).

80. Cellular activities energy source

ATP serves as the main energy source for cellular processes and activities.

81. Redox reactions

Reactions involving the transfer of electrons that are fundamental in metabolism.

82. ATP in muscle cells

ATP is critical for muscle contractions and energy-intensive activities.

83. Enzyme-substrate interaction

The specific way an enzyme interacts with its substrate to catalyze a reaction.

84. Glycogen breakdown

The process of converting glycogen into glucose to release energy when needed.

85. Energy in ecosystems

Energy flows through ecosystems from producers to top predators.

86. Biomass production

Energy stored in organic matter produced by photosynthetic organisms.

87. Energy exchange in food webs

The transfer of energy through different trophic levels in an ecosystem.

88. Plant energy storage

Plants store energy in the form of starch and carbohydrates for later use.

89. Carbon cycle

The circulation of carbon atoms in ecosystems, including photosynthesis and respiration.

90. Soil respiration

The process of releasing carbon dioxide through the decomposition of organic matter.

91. Creatine phosphate

A high-energy molecule used by muscles to quickly regenerate ATP during short bursts of activity.

92. Oxygen debt

The amount of oxygen required to oxidize lactic acid in muscles after strenuous exercise.

93. Bioluminescence energy

The ability of organisms to produce light through chemical reactions, often involving ATP.

94. Energy efficiency in organisms

The ratio of energy output from metabolic processes to the energy input into those processes.

95. Energy in metabolic heat

The energy lost as heat during metabolic processes, inefficiently used by organisms.

96. Biomass energy conversion

The process of converting organic materials into usable energy forms, such as biofuels.

97. Energy systems and technology

The study of how energy is generated, transformed, and consumed in biological and ecological systems.

98. Eutrophication

The process where water bodies receive excess nutrients that stimulate excessive plant growth.

99. Adaptive energy strategies

Methods by which organisms optimize energy use to survive in diverse environments.

100. Environmental impact on metabolism

The influence of environmental conditions on the metabolic rates and energy demands of organisms.