AP Biology · Unit 1: Chemistry of Life
1.2 Elements of Life
In short
You must understand that atoms and molecules from the environment are necessary to build new molecules. The required depth includes knowing that carbon, hydrogen, and oxygen are the foundational and most prevalent elements used to build carbohydrates, proteins, lipids, and nucleic acids.
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What else do you need to know about Elements of Life?
Furthermore, you must know the specific elemental requirements for certain macromolecules: sulfur is used in the building of proteins; phosphorus is used in the building of phospholipids and nucleic acids; and nitrogen is used in the building of nucleic acids. The focus is on the elemental composition rather than the complex molecular structures themselves.
Can you do these?
- I can describe the elemental composition of the major macromolecules required by living organisms.
- I can identify that carbon, hydrogen, and oxygen are the most prevalent elements in carbohydrates, proteins, lipids, and nucleic acids.
- I can state that sulfur is used in the building of proteins.
- I can state that phosphorus is used in the building of phospholipids and nucleic acids.
- I can state that nitrogen is used in the building of nucleic acids.
How is Elements of Life tested on the exam?
This topic is paired with Science Practice 2.A ('Describe characteristics of visual representations of biological concepts and processes'). In exam questions, you may be asked to identify macromolecules based on their elemental composition in visual models, or predict which biological molecules an organism can synthesize given a restricted availability of specific elements (e.g., a lack of phosphorus limiting nucleic acid and phospholipid synthesis).
Free practice questions with full explanations, and instant marking of your free-response answers.
Elements of Life: common questions
What do you need to know about Elements of Life for AP Biology?
You must understand that atoms and molecules from the environment are necessary to build new molecules. The required depth includes knowing that carbon, hydrogen, and oxygen are the foundational and most prevalent elements used to build carbohydrates, proteins, lipids, and nucleic acids.
How is Elements of Life tested on the AP Biology exam?
This topic is paired with Science Practice 2.A ('Describe characteristics of visual representations of biological concepts and processes').
How do I know I have mastered Elements of Life?
Check you can do each of these: describe the elemental composition of the major macromolecules required by living organisms; identify that carbon, hydrogen, and oxygen are the most prevalent elements in carbohydrates, proteins, lipids, and nucleic acids; state that sulfur is used in the building of proteins; state that phosphorus is used in the building of phospholipids and nucleic acids; state that nitrogen is used in the building of nucleic acids.
Where does Elements of Life fit in AP Biology?
Elements of Life is topic 1.2 in Unit 1: Chemistry of Life of AP Biology.
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