Biology 2107                                                                          Fall, 2022

Quiz #3

 

 

Name: __________________________                                                               ID#:  ______________________

 

 

SECTION 1A

Please circle the letters that precede the most appropriate answer(s) to the question asked.  Be aware, there is only one answer to each question. 

2pts for each correct answer.

 

 

1.         The main difference between aerobic and anaerobic cellular respiration is..

 

A         Aerobic respiration needs water while anaerobic respiration need not.

B         Anaerobic respiration needs ATP and aerobic respiration does not.

C         ATP is created either way.

D         Aerobic respiration needs O2 and anaerobic respiration does not.

E          Water is essential for BOTH reactions.

 

2.         The change in Standard “Gibbs” free energy (∆Go) for the condensation of ADP and Pi into ATP is +7.3 kcal/mol.   What can you conclude from this information?

 

A.        The reaction will never reach equilibrium at pH10.

B.        The potential energy of ADP and phosphate is 7.3 times the free energy of ATP.

C.        The reaction is driven by the ATP that is formed in the reaction.

D.        The reaction is endergonic.

E.         The reaction is exergonic.

 

3.         Which statement best describes carbon fixation in the “Dark cycle”?

 

A         Phosphate groups are donated by ADP to carbon, creating phosphorylated

            3-carbon molecules

B         3 carbon dioxide molecules are directly rearranged and energized into 3 x G3P

C         RuBP is converted into carbon dioxide, giving off a phosphate

D         Atmospheric oxygen is converted into carbon dioxide

E          RuBisCo converts inorganic carbon dioxide into organic molecules

F          Carbon dioxide is converted into oxygen

 

4.         Which of the following reactions is an exergonic reaction (perhaps after a little bit of persuasion).

 

A         C6H12O6 + 6 O2 + 6 H2O 6 CO2 + 12 H2O

B         H2O 2 e- + 2 H+ + 1/2 O2

C         H2O 2 e- + 2 H+ + 1/2 O2

D         C6H12O + 6 O2 + 6 H2O    6CO2 + 12 H2O

E          Glucose 6 phosphate + Pi Glucose 6 phosphate

 

5.         From your understanding of the lectures to date, why do some organisms ferment pyruvate?

 

A         They happen to like alcohol

B         These organisms are able to gain energy directly from the production of molecules such as lactate from pyruvate.

C         These organisms need to replenish the ATP that had been used up in glycolysis

D         Alcohol production is a major requirement of normal aerobic cellular function

E          These organisms need to replenish their NAD+ stores that have been used in glycolysis

F          Hey, why not?

 

6.         Which of the following equations best equates to the “generic” process of aerobic cellular respiration?

 

A         C6H12O6 + 6 O2 + 6 H2O 6 CO2 + 12 H2O + light energy 

B         C6H12O6  + 6 O2 + 6 H2O + light energy 6 CO2 + 12 H2O

C         C6H12O6  + 6 O2 6 CO2 + 6 H2O

D         C6H12O6  + 6 O2 + 6 H2O 6 CO2 + 12 H2O

E          C6H12O6  + 6 O2     6 H2O + 6 CO2

 

7.         In a molecule of double stranded DNA the amount of Cytosine (C) present is always equal to the amount of

 

A         Thiamin (T)

B         Adenine (A)

C         Uracil (U).

D         Guano (G)

E          Atropine (A).

F.         Guanine (G)

G.        Thymine (T)

 

 

8.         All of the following are steps of cellular respiration, EXCEPT:

 

A         Glycolysis

B         Calvin Cycle

C         Pyruvate Oxidation.

D         Electron Transport Chain

E          Citric Acid Cycle

 

9.         Which statement would best describe an “electron transport chain” in aerobic respiration in eukaryotes

 

A         Essentially a “bucket brigade” of protons passing through an ATP synthase enzyme

B         Essentially a series of redox reactions taking place in the cytoplasm

C         Essentially the energy yielding expulsion of electrons out of the cell.

D         Essentially a series of redox reactions taking place between proteins embedded in the membrane of a mitochondrion

E          Essentially an energy yielding passage of electrons into the cell, back down their concentration gradient

 

10.      The change in Standard “Gibbs” free energy (∆Go’) for the condensation of ADP and Pi to ATP is 7.3 kcal/mol.   What can you conclude from this information?

 

A.        The reaction will never reach equilibrium at pH10.

B.        The potential energy of ADP and phosphate is 7.3 times the free energy of ATP.

C.        The reaction is a condensation reaction.

D.        The reaction is endergonic.

E.         The reaction is exergonic.

 

11.      Which of the following represents the “oxidized form” of  flavine adenine dinucleotide?

 

A         NADH2

B         NAD+

C         FAD+

D         FADH2

E          FAD

 


SECTION 1B 

In the next six questions please circle your “best” evaluation of the statement given. 

If you choose “False”, please explain in the line provided.  3pts for each completely correct answer!!!

 

12.      In a “redox reaction” a reductant will lose hydrogens and/or electrons, and will be reduced.

 

True                                                             False

 

___________A reductant will become oxidised_______________________________________________

 

13.      Fermentation yields far less energy than aerobic cellular respiration.

 

True                                                             False

 

____________________________________________________________________________________________

 

14.      During any and all interconversion of forms of energy, there is no gain or loss of “useable” energy.

 

True                                     False                                                               2pts

 

_____”total” not “useful”_________________________________________ _1pt ________________

 

15.      The final acceptor of electrons in photosynthesis during the “light reaction” is H2O.

 

True                                     False                                                              2pts

 

_________ H2O DONATES electrons back to chlorophyll at the ground state________________________

 

16.      Central Dogma explains how proteins are synthesized directly from the genes in our DNA.

 

True                                                             False

 

___________NOT directly…. If there are any concerns in the answer about “directly  -2 pts._________

 

 

17.      Catabolic reactions are always exergonic, while anabolic reactions are always endergonic.

 

True                                     False                                                              2pts

 

_____exergonic and endergonic reactions are found in both anabolic and catabolic pathways_____1pt _