Microbiology Quiz Chapter 5
Questions based on the Microbiology an introduction manual and learning objectives provided by the teacher (which are similar to those from the book)
- 1.Oxidation-reduction reactions are complex ones. Find the true facts.
- A.
Also called redox reaction
- B.
Oxidation is the removal of electrons from an atom or molecule, which will produce energy and reduction is the gaining of electrons
- C.
NADH is the oxidized form while NAD+ is the reduced form
- D.
Glucose is a reduced molecule
- 2.A ______ is en enzymatic RNA molecule that cut and splice RNA in ______ cells.
- 3.Competitive inhibitors fill the active site of an enzyme and compete with the normal substrate for the active site. They do that because their shape and chemical structure are similar to those of the normal substrate.
- A.
True
- B.
False
- 4.Which is not true about noncompetitive inhibitors?
- A.
They interact with another part of the enzyme, called allosteric site
- B.
This binding will change the shape of the active site, making it nonfunctional
- C.
The enzyme activity remains the same all in all
- D.
Depending of the ability of the active site to return to its original shape, it can be either reversible or irreversible
- 5.What are the factors that influence the enzymatic activity? (can chose more than one)
- A.
Competitive and noncompetitive inhibitors
- B.
PH: enzyme activity declines when above or below optimum pH of most enzymes
- C.
Temperature: rate of reaction declines beyond the optimal temperature because the enzyme loses its characteristics (tertiary configuration), called denaturation
- D.
Enzymatic activity increases as substrate concentration increases until the enzymes are saturated
- 6.Metabolism is defined by the sum of all chemical reactions within a living organism. What is right to say concerning anabolism and catabolism?
- A.
Catabolism refers to chemical reactions that result in the breakdown of more complex organic molecules into simple substances.
- B.
Catabolic and anabolic reactions usually require energy
- C.
Anabolism refers to chemical reactions in which complex substances are combined together to form even more complex molecules
- D.
The energy for chemical reactions is stored in ATP
- E.
Metabolism is the bigger category that is divided in chemical reactions that release energy and chemical reactions that require energy
- F.
A, B, and C are correct
- G.
A, D, and E are correct
- H.
B and C are correct
- I.
None is correct
- J.
All is correct
- 7.ATP plays an important role as an intermediate between catabolism and anabolism. Why is that? (can pick more than one)
- A.
ATP stores energy derived from catabolic reactions and releases it later to drive anabolic reactions and perform other cellular work
- B.
Catabolic reactions transfer energy from complex molecules to ATP such as glucose, starch and lipids
- C.
Anabolic reactions transfer energy from ATP to complex molecules such as glycerol, fatty acids and proteins
- D.
When the terminal phosphate group is split from ATP, adenosine diphosphate (ADP) is formed, and energy is released to drive anabolic reactions
- 8.All but one is false about the components of enzymes.
- A.
They are specific
- B.
Catalysts are substances that can speed up a chemical reaction without being permanently altered themselves. Enzymes serve as biological catalysts.
- C.
Have an active site
- D.
The enzyme-substrate complex formed by the temporary binding of enzymes and reactants enables the collisions to be more efective and increases the activation energy of the reaction.
- 9.What are the products made during the Krebs cycle?
- A.
6 NADH
- B.
2 Pyruvates
- C.
4 CO2
- D.
Acetyl CoA
- E.
2 Guanosine diphosphate (GDP)
- F.
2 FADH2
- G.
2 FAD
- H.
2 Guanosine triphosphate (GTP)
- I.
6 NAD+
- 10.What are the products made during glycolysis? (can chose more than one)
- A.
2 Adenosine triphosphate (ATP)
- B.
2 H2O
- C.
2 adenosine diphosphate (ADP)
- D.
2 NADH
- E.
2 Pyruvic acids
- F.
2 NAD+
- 11.Aerobic respiration, anaerobic respiration and fermentation compared.
- A.
Fermentation can be either aerobic or anaerobic. It releases energy from sugars or other organic molecules by oxidation.
- B.
Fermentation requires O2
- C.
NAD+ is being reduced in fermentation, glycolysis and Krebs cycle
- D.
Aerobic respiration consists of the Krebs Cycle, the Electron Transport Chain (system) and chemiosmosis
- E.
The final electron acceptor in aerobic respiration is an inorganic molecule other than O2 or, rarely, an organic molecule
- F.
Glycolysis is an aerobic pathway for the oxidation of glucose
- G.
The total ATP yield is less than in aerobic respiration because only part of the Krebs cycle operates under anaerobic conditions
- H.
B, E, and F are false
- I.
B, C, E and G are false
- J.
All is true
- K.
All is false
- 12.Lipids and proteins catabolism
- A.
Lipases break down fat into its fatty acids and glycerol components
- B.
Proteases and peptidases break down proteins into amino acids
- C.
Transamination, decarboxylation and dehydrogenation reactions convert the amino acids to be catabolized
- D.
A and B are false
- E.
All is false
- F.
None is false
- 13.Possible alternatives to glycolysis are:
- A.
Pentose phosphate pathway
- B.
Calvin-Benson cycle
- C.
Krebs cycle
- D.
Entner-Doudoroff pathway
- E.
Embden-Meyerhof pathway
- 14.An amphibiotic pathway is a metabolic pathway that functions in both anabolism and catabolism.
- A.
True
- B.
False
- 15.Bonus question: we are ready for tomorrow's test.
- A.
True, so easy man.
- B.
False, never ready for that.
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