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Grade 10 Periodic Table and Elements
Carbon-13 is an                 of carbon.
  1. atomic number
  2. atomic mass
  3. allotrope
  4. isotope
Grade 10 Cell Structure and Function
All organic molecules consist of mainly                     atoms.
  1. carbon
  2. carbon and oxygen
  3. carbon and hydrogen
  4. carbon and nitrogen
Grade 10 Environmental Science
What do you call the process involving buying and selling rights to emit carbon dioxide?
  1. Carbon adaptation
  2. Carbon dating
  3. Carbon footprint
  4. Carbon trading
Grade 7 Global Issues
Grade 9 Environmental Science
Where are the largest stores of carbon in the earth's carbon cycle?
  1. In the atmosphere
  2. Dissolved in water
  3. Sediment and sedimentary rock
  4. In oil and coal refineries
Grade 7 Atomic Structure
An isotope of carbon is                .
  1. boron-12
  2. nitrogen-12
  3. carbon-14
  4. hydrogen-2
Grade 8 Periodic Table and Elements

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College Environmental Science
Carbon dioxide is
  1. the most potent (per molecule of gas) of the greenhouse gases.
  2. the most abundant greenhouse gas.
  3. more potent (per molecule of gas) than methane.
  4. the main anthropogenic greenhouse gas produced in the United States.
  5. the only greenhouse gas presently increasing in the atmosphere.
Grade 9 Biochemical Pathways
What type of molecule is created during the last step of the Krebs cycle?
  1. a 3-carbon molecule
  2. a 4-carbon molecule
  3. a 6-carbon molecule
  4. a 7-carbon molecule
Grade 9 Biochemical Pathways
Which molecule is needed to start the reactions of the Krebs cycle?
  1. a 3-carbon molecule
  2. a 4-carbon molecule
  3. a 6-carbon molecule
  4. a 7-carbon molecule
Grade 9 Macromolecules
What three elements make up all carbohydrates?
  1. nitrogen, hydrogen, carbon
  2. carbon, oxygen, sulfur
  3. carbon, hydrogen, and oxygen
  4. carbon, hydrogen, and sugar
Grade 9 Biochemical Pathways
Which molecule accepts acetyl CoA during the first step of the Krebs cycle?
  1. a 3-carbon molecule
  2. a 4-carbon molecule
  3. a 6-carbon molecule
  4. a 7-carbon molecule
Grade 5 Botany
In the carbon cycle, which event provides plants with carbon dioxide?
  1. bear breathing in a forest
  2. leaf falling on the ground
  3. flower blooming in a garden
  4. light shining on a plant
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