All energy on Earth ultimately comes from?

• fossil fuels (oil, coal and natural gas)
• the Sun
• plant life
• geological processses

How many phosphate groups are found in ATP?

• One
• Two
• Three
• Ten

Energy is released from ATP, and it becomes ADP, when...

• the bond between the adenine base and the ribose sugar is formed
• the bond between the adenine base and the ribose sugar is broken
• the bond between the ribose sugar and the first phosphate group is broken
• the bond between the last two phosphate groups is broken

Which of the following organisms makes its own food using light energy from the sun?

• decomposers
• chemoautotrophs
• heterotrophs
• photoautotrophs

Photosynthesis uses sunlight to convert water and carbon dioxide into what?

• oxygen and carbon
• oxygen and glucose
• ATP and oxygen
• high-energy sugars and proteins

If carbon dioxide is completely removed from a plant’s environment, what would you expect to happen to the plant’s production of glucose and other high-energy sugars?

• More glucose will be produced.
• No glucose will be produced.
• Fewer glucose molecules will be produced at first, but then the plant will recover.
• The same number of glucose molecules will be produced but without carbon dioxide.

Which of the following is one of the ways that cellular respiration and photosynthesis are opposite processes?

• Photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration puts it back.
• Photosynthesis removes oxygen from the atmosphere, and cellular respiration puts it back.
• Photosynthesis releases energy, and cellular respiration stores energy.
• Photosynthesis consumes glucose, and cellular respiration produces glucose.

Which letter in the diagram represents oxygen?

• Letter A
• Letter B
• Letter C
• Letter D

Which letter in the diagram represents carbon dioxide?

• Letter A
• Letter B
• Letter C
• Letter D

Which letter in the diagram represents the site of the light-dependent reactions?

• Letter A
• Letter B
• Letter C
• Letter D