Question 1

The energy that is used by almost all living things on our planet comes from the sun. It is captured by plants, algae, and some bacteria through the process of

	A) thylakoid.
	B) chloroplasts.
	C) photosynthesis.
	D) the Calvin cycle.

Question 2

Plants capture sunlight

	A) with netlike structures in their leaves that catch and hold photons.
	B) with molecules called pigments that catch photons and use their energy.
	C) with sticky molecules that catch photons and transfer their energy.
	D) by angling their leaves slightly to the sun's rays for more absorbance of photons.

Question 3

Once a plant has initially captured the energy of a photon

	A) a series of reactions occurs in various membranes of the cell.
	B) the energy is transferred through several steps into a molecule of ATP.
	C) several pigments, including two kinds of chlorophyll, may be involved.
	D) all of the above are true.

Question 4

Plants use two photosystems to produce ATP and NADPH. The electrons used in these photosystems

	A) recycle through the system constantly, with energy added from the photons.
	B) recycle through the system several times, using energy added from photons, and then are lost due to entropy.
	C) only go through the system once; they are obtained by splitting a water molecule.
	D) only go through the system once; they are obtained from the photon.

Question 5

The purpose of photosynthesis is to

	A) obtain the energy to make organic molecules from carbon dioxide.
	B) obtain the energy to make organic molecules from starches.
	C) make energy.
	D) all of the above are true.

Question 6

Some plants cannot carry out the typical C₃ photosynthesis in hot weather, so they

	A) use the ATP cycle.
	B) use the C₄ cycle or CAM.
	C) wait until evening to carry out photosynthesis.
	D) all of the above are true for different plants.

Question 7

In animals, the energy for life is obtained by cellular respiration. This involves

	A) breaking down the organic molecules that were produced by plants.
	B) capturing photons from plants.
	C) utilizing ATP that was produced by plants.
	D) breaking down CO₂ that was produced by plants.

Question 8

Every living creature on this planet is capable of carrying out the rather inefficient biochemical process of glycolysis, which

	A) makes glucose using the energy from ATP.
	B) makes ATP by splitting glucose and capturing the energy.
	C) phosphorylates ATP to make ADP using the energy from photons.
	D) makes glucose using oxygen, carbon dioxide, and water.

Question 9

After glycolysis the pyruvate molecules

	A) go to the nucleus of the cell and provide energy.
	B) go to the membranes of the cell and are broken down in the presence of CO₂ to make more ATP.
	C) go to the mitochondria of the cell and are broken down in the presence of O₂ to make more ATP.
	D) go to the golgi bodies and are packaged and stored until needed.

Question 10

The vast majority of the ATP molecules produced within a cell are produced

	A) during photosynthesis.
	B) during glycolysis.
	C) during the Krebs cycle.
	D) within the electron transport system.