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College Biochemistry Questions

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College Biochemical Pathways
During photosynthesis, ATP molecules are generated by
  1. chemiosmosis
  2. the splitting of water
  3. digestion
  4. fermentation
College Macromolecules
What affects do catalysts have on reactions?
  1. They lower the activation energy for the reaction
  2. Alter the reactions change in free energy
  3. Increases reaction rate
  4. No effect
  5. A and C
College Biochemical Pathways
What is the molecule that enters the citric acid cycle?
  1. pyruvic acid
  2. lactic acid
  3. citric acid
  4. acetyl coenzyme A
College Macromolecules
Which of the following statements about enzymes is FALSE?
  1. enzymes are highly specific.
  2. Enzymes do not affect equilibrium.
  3. Enzymes lower activation energy.
  4. Enzymes can be recycled.
  5. Enzymes can convert an endergonic to an exergonic reaction.
College Biochemical Pathways
If the arrow in the below chemical formula points to the right, what process is it and which steps occur during that process?
6CO2+12H2O□C6H12O6+6O2+6H2O
  1. Cellular respiration: Glycolysis, Kreb's cycle, ETC
  2. Photosynthesis: Glycosis, Kreb's cycle, ETC
  3. Cellular respiration: Light dependent reactions, Calvin cycle
  4. Photosynthesis: Glycolysis, Kreb's cycle, ETC
  5. Photosynthesis: Light dependent reactions, Calvin Cycle
College Biochemical Pathways
In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of                             .
  1. ATP, CO2, and lactate
  2. ATP, pyruvate and acetyl CoA
  3. ATP, NADPH, and pyruvate
  4. ATP, pyruvate and oxygen
  5. ATP, CO2 and ethanol
College Biochemical Pathways
To what does pyruvate undergo oxidation when it loses electrons?
  1. carbon dioxide
  2. NAD+
  3. glucose
  4. NADH
College Biochemical Pathways
Which of the following statements regarding cellular respiration is true?
  1. cellular respiration produces glucose
  2. cellular respiration produces carbon dioxide as an end product
  3. cellular respiration produces oxygen as a waste product
  4. cellular respiration is a single chemical reaction with just one step
College Biochemical Pathways
Why do photosynthesis and aerobic respirations form a balanced cycle in the biosphere?
  1. both processes produce about equal amounts of oxygen
  2. both processes break down organic molecules into CO2 and H2O
  3. both processes occur in the mitochondria
  4. their overall reactions are exactly the opposite of one another
  5. photosynthesis operates only in plants, while respiration operates only in animals
College Biochemical Pathways
Match the method of producing ATP with the appropriate choices below.

1. An inefficient pathway that can be used when no oxygen is present, makes lactic acid or ethanol to regenerate NAD+

2. Method employed by mostly bacteria in environments with no oxygen

3. A method that uses oxygen as the final electron acceptor
  1. Anaerobic respiration, Aerobic respiration, Fermentation
  2. Fermentation, Anaerobic respiration, Aerobic Respiration
  3. Aerobic respiration, Anaerobic respiration, Fermentation
  4. Fermentation, Aerobic respiration, Anaerobic respiration
  5. None of the above
College Biochemical Pathways
Which of the following is not a product of the light reactions of photosynthesis?
  1. Oxygen gas
  2. ATP
  3. NADPH + H+
  4. Glucose
College Biochemical Pathways
Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?
  1. ATP and NADPH
  2. ADP, Pi, and NADP+
  3. H20 and O2
  4. electrons and H+
  5. CO2 and glucose
College Biochemical Pathways
Which of these is the overall equation for cellular respiration of glucose?
  1. C5H12O6+6O2→5CO2+6H2O+ATP+heat
  2. 5CO2+6H2O→C5H12O6+6O2+ATP+heat
  3. C6H12O6+ATP+heat→6CO2+6O2+6H2O
  4. 4CO2+12H2O→2C5H12O6+8O2+ATP+heat
  5. C6H12O6+6O2→6CO2+6H2O+ATP+heat
College Biochemical Pathways
Energy is stored in the third bond of                .
  1. Glucose
  2. ATP
  3. Hydrogen
  4. Proteins
College Biochemical Pathways
The loss of an electron is involved in                         .
  1. Phosphorylation
  2. Reduction
  3. Electron transport chain
  4. Oxidation
College Biochemical Pathways
During cellular respiration, NADH                                                                                             .
  1. is chemically converted into carbon dioxide
  2. is reduced to form NAD+
  3. delivers its electron load to the electron transport chain
  4. is the only electron carrier that collects and transports electrons to the citric acid cycle
College Macromolecules
What forms the sugar/phosphate backbone of each strand of DNA?
  1. Phosphodiester covalent bonds
  2. Hydroxyldiester covalent bonds
  3. Manganesdiester covalent bonds
  4. Carbodiester covalent bonds
College Biochemical Pathways
In aerobic respiration the function of oxygen is to combine with                                                                  .
  1. ATP in the Krebs cycle
  2. Glucose in the glycolysis cycle
  3. Enzymes at the active site
  4. electrons and hydrogen at the end of the electron transport chain
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