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1.2 Elements of Life: revision map

The subtopic in the middle and four tasks round it: label a diagram, complete a table, put a process in order and fill 11 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.

Unit 1 practice questions The whole Unit 1 map

Topic 1.2

Elements of Life

AP Biology · Unit 1 Chemistry of LifeName

1.2.AElements and the molecules they build

Element	Used to build	Where in the molecule
	carbohydrates, lipids, proteins and nucleic acids	the backbone every organic molecule is built on
	proteins and nucleic acids	amino groups of amino acids; the bases of DNA and RNA
	nucleic acids and phospholipids	the phosphate groups of the nucleotide backbone and the lipid head
Hydrogen and oxygen	all four classes	sugars, fatty acids and water itself

1.2.ACarbon from the air into a protein

Number the steps in order.

Carbon dioxide enters a leaf from the air.
Photosynthesis fixes the carbon into sugar.
Amino acids are joined into a protein.
The sugar is broken down into smaller carbon skeletons.
Nitrogen taken up from the soil is added to the skeletons to make amino acids.

Topic 1.2Elements of Life

1.2.AMatter exchanged with the environment

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1.2.AMatter in, matter out

To grow, reproduce and keep their organization, organisms must matter with the environment. Atoms are rearranged rather than made: carbon in the molecules of your body was once carbon dioxide in the air, taken in by a plant. Heterotrophs get these elements by eating other organisms. A growing cell that cannot get enough cannot make new protein or , and one short of cannot make new membranes or nucleotides.

Word bank Carboncarbon dioxideDNAexchangenitrateNitrogennitrogenoxygenphosphatePhosphorusphosphorus

Answer key

Every box on the sheet with its gaps filled in, as the subtopic reads in full.

TableElements and the molecules they build

Element	Used to build	Where in the molecule
Carbon	carbohydrates, lipids, proteins and nucleic acids	the backbone every organic molecule is built on
Nitrogen	proteins and nucleic acids	amino groups of amino acids; the bases of DNA and RNA
Phosphorus	nucleic acids and phospholipids	the phosphate groups of the nucleotide backbone and the lipid head
Hydrogen and oxygen	all four classes	sugars, fatty acids and water itself

LabelMatter exchanged with the environment
1. carbon dioxide
2. oxygen
3. nitrate
4. phosphate
OrderCarbon from the air into a protein
1. Carbon dioxide enters a leaf from the air.
2. Photosynthesis fixes the carbon into sugar.
3. The sugar is broken down into smaller carbon skeletons.
4. Nitrogen taken up from the soil is added to the skeletons to make amino acids.
5. Amino acids are joined into a protein.
GapsMatter in, matter out
To grow, reproduce and keep their organization, organisms must exchange matter with the environment. Atoms are rearranged rather than made: carbon in the molecules of your body was once carbon dioxide in the air, taken in by a plant. Heterotrophs get these elements by eating other organisms. A growing cell that cannot get enough nitrogen cannot make new protein or DNA, and one short of phosphorus cannot make new membranes or nucleotides.