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College Biochemistry Questions

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College Biochemical Pathways
What happens during chemiosmosis?
  1. energy is released as H+ ions move feely across mitochondrial membranes
  2. H+ do NOT play any role in the production of ATP molecules
  3. a concentration gradient is generated when large numbers of H+ ions are passively transported from the matrix of the mitochondrion to the mitochondrion's intermembrane space
  4. ATP is synthesized when H+ ions move through a channel in ATP synthase
College Macromolecules
Select all that are part of a nucleotide.
  1. A five-carbon sugar
  2. A phosphate group
  3. a nitrogenous base
  4. an oxygen base
  5. an alcohol base
  6. 3 deoxyribose
College Macromolecules
College Biochemical Pathways
Which statement regarding glycolysis is true?
  1. Glucose is not catabolized.
  2. NADH is not formed.
  3. Pyruvate is not formed.
  4. Oxygen is not required.
  5. ATP is not formed.
College Biochemical Pathways
Which of the following is true of Light Reactions?
  1. light energy is converted to chemical energy
  2. the energy is temporarily stored in ADP
  3. the energy is temporarily storied in NADPH
  4. Light is captured through absorption of light in the chloroplasts, found only in plants and bacteria.
  5. Pigments store all wavelengths of light
College Macromolecules
Which of these makes up sucrose?
  1. glucose and galactose
  2. glucose and glucose
  3. fructose and galactose
  4. fructose and glucose
College Biochemical Pathways
Which is an example of catabolism?
  1. Homeostasis
  2. Hydrolysis
  3. Dehydration synthesis
College Biochemical Pathways
What are the four stages of cellular respiration?
  1. glycolysis
  2. transition reaction
  3. kreb's cycle
  4. Electron Transport Chain
  5. none of the above
  6. all of the above
  7. only answers b & d
  8. only answers a & c
College Macromolecules
Which of these occurs at the end of a chemical reaction?
  1. an enzyme's structure is altered
  2. an enzyme is detached from the product, has its original structure, and can catalyze more chemical reactions
  3. the enzyme loses its ability to catalyze other chemical reactions
  4. the enzyme remains attached to the products
  5. none of the above
College Biochemical Pathways
What is a primary function of chlorophyll in plants and algae?
  1. It refracts sunlight
  2. It helps the plants grow
  3. Nutrients the cytoskeleton
  4. It oxidizes sugar
College Biochemical Pathways
Match these with the appropriate terms (in order).

1. Non-protein helpers increase catalytic activity of enzyme- can be inorganic metal ions

2. Resembles substrate and competes for binding site on enzymes

3. Molecules that increase catalytic activity but are inorganic
  1. Cofactors, Noncompetitive Inhibitor, Coenzymes
  2. Allosteric site, Competitive inhibitor, Coenzymes
  3. Coenzymes, Competitive inhibitor, Cofactors
  4. Cofactors, Competitive inhibitor, Coenzymes
  5. None of the above
College Biochemical Pathways
What do accessory pigments do?
  1. They add energy to the Kreb's cycle
  2. They both build bonds in glucose
  3. They increase the amount of light energy that can be captured
  4. They work during the light dependent reactions
  5. C and D are both correct
College Biochemical Pathways
College Biochemical Pathways
The processes of cellular respiration and photosynthesis are complementary. During these energy conversions                                                                                    .
  1. products of cellular respiration become reactants for photosynthesis and vice-versa
  2. glucose is used to produce light energy
  3. some energy is lost in the form of heat
  4. high energy molecules like CO2, O2, and H2O are produced
  5. a and c
College Biochemical Pathways
College Macromolecules
What type of carbohydrate is a complex sugar?
  1. monosaccharide
  2. disaccharide
  3. both
  4. Neither
College Biochemical Pathways
In aerobic respiration, electrons are added to NAD+ and make NADH. From where do these electrons come?
  1. the splitting of water
  2. the carbons of glucose
  3. the breakdown of ATP
  4. the formation of a proton gradient
  5. the electron transport chain
College Macromolecules
Cx H2x Ox is an example of                .
  1. Carbohydrate
  2. Lipids
  3. Protein
  4. Nucleic Acids
College Macromolecules
Which of the following statements regarding membrane protein function is false?
  1. membrane proteins serve as enzymes
  2. membrane proteins act as receptors to molecules
  3. membrane proteins serve as active transporters of molecules
  4. membrane proteins form junctions between cells
  5. membrane proteins cause the plasma membrane to be selectively permeable
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