Electrons generated from the Krebs cycle go next to the

  1. fermentation pathway

  2. electron transport chain

  3. formation of alcohol

  4. fluid portion of the mitochondrion



Identify ‘c' as the _____

  1. outer membrane

  2. cristae

  3. matrix

  4. inner membrane

  5. intermembrane space



Which of the following macromolecules can be broken down into intermediate products that enter cellular respiration?

  1. Proteins

  2. Lipids

  3. Nucleic acids

  4. Carbohydrates

  5. All of the choices are correct.



Substrates that reoccur in several metabolic pathways form the metabolic pool. Study the figure to match the substrates with the corresponding pathway.

  1. A is glycerol; B is amino acids; C is glucose; D is fatty acids

  2. A is glucose; B is fatty acids; C is glycerol; D is amino acids

  3. A is amino acids; B is fatty acids; C is glucose; D is glycerol

  4. A is amino acids; B is glucose; C is glycerol; D is fatty acids



Which statement is NOT true about photosystems?

  1. Electrons in the reaction center molecule are excited by absorbed solar energy and are passed along to an acceptor molecule.

  2. Photosystem I passes electrons on to Photosystem II.

  3. Photosystem I contains a reaction center molecule that loses electrons which are then replaced by electrons from water

  4. Each photosystem contains numerous pigment molecules that act as antennas to capture light.



Identify ‘b' as the _____

  1. intermembrane space

  2. inner membrane

  3. matrix

  4. cristae

  5. outer membrane



If the Calvin cycle uses three molecules of CO2 to produce six molecules of G3P (glyceraldehydes-3-phosphate), but only one G3P molecule is used to form a carbohydrate molecule, what happens to the other carbons that were taken in?

  1. The remaining five G3P molecules are used to reduce CO2.

  2. Any unused G3P molecule is converted and stored as starch.

  3. The other five G3P molecules are used to regenerate more RuBP.

  4. Any unused CO2 is released into the environment.



This product of glycolysis, ________, is degraded in the final stages of aerobic pathways.

  1. acetyl - CoA

  2. lactic acid

  3. water

  4. pyruvate

  5. oxaloacetate



The major enzyme that ‘fixes' carbon dioxide is called

  1. glyceraldehyde-3-phospate (G3P).

  2. ribulose bisphosphate carboxylase (rubisco)

  3. lactate dehydrogenase

  4. PEP carboxylase (PEPcase).



Where do the light reactions begin in photosynthesis?

  1. Photosystem I

  2. The electron acceptor

  3. Photosystem II

  4. The electron transport chain

  5. The Calvin cycle



The light reactions begin with the noncyclic electron pathway, which involves first photosystem II, and then photosystem I. The Calvin cycle is not part of the light reactions.