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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 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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Grade 7 Global Issues
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 5 Botany
Which event provides plants with carbon dioxide in the carbon cycle?
  1. a bear breathing in a forest
  2. a leaf falling on the ground
  3. a flower blooming in a garden
  4. a light shining on a plant
Grade 9 Atomic Structure
Carbon-14 is an unstable form of carbon that is slightly radioactive. What is the best explanation why this isotope of carbon is less stable than other forms of carbon?
  1. It has a different number of protons than other forms of carbon.
  2. It is missing electrons.
  3. It is a compound.
  4. It has a different number of neutrons than other forms of carbon.
  5. It does not occur naturally.
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 5 Reactions
Grade 12 Environmental Science
The difference between carbon assimilation and carbon emission is known as what?
  1. Carbon Analysis
  2. Carbon Source
  3. DBH
  4. Net Primary Productivity
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
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