Practice Quiz 7 (bioenergetics, glycolysis)
You have 20 minutes to finish the quiz.
Q.1 :
A substance is oxidized if :
electrons are added to the substance
electrons are removed from the substance
hydrogen is used up
oxygen is produced
Q.2 :
In the reaction CH
4
+ 2O
2
= CO
2
+ 2H
2
O
methane is reduced
a net amount of electrons are generated
oxygen is oxidized
carbon is oxidized
Q.3 :
Which pair does not represent the reduced and oxidized form of a compound?
CH
3
OH ...... CO
2
H
2
O ..... O
2
......
CH
4
...... CO
2
CH
4
...... H
2
O
Q.4:
The oxidation reaction: CH
4
+ 2O
2
= CO
2
+ 2H
2
O
has a positive free energy change
has a positive enthalpy change
is endergonic
is exergonic
Q.5:
In the oxidation of glucose to CO2
the enthropy change is negative
the free energy change is negative
the enthalpy change is positive
the free energy change is positive
Q.6 :
The change in free energy of a metabolic reaction is related to
the change in the pressure
the change in volume
the heat evolved or consumed in the reaction
all of the above
Q.7 :
The enthalphy change in a reaction
is the heat evolved or consumed at constant volume
is the heat evolved or consumed at constant pressure
is the free energy released or absorbed in a reaction
none of the above
Q.8 :
The standard free energy change for the hydrolysis of ATP to ADP + phosphate is -7.3 kcal/mol (ATP + H2O = ADP + phosphate ). The phosphorylation of a protein requires a free energy of +6 kcal/mol ( Protein + phosphate = protein-P ). Which of the below statements is correct ?
the hydrolysis of ATP is an endergonic reaction
the phosphorylation of the protein is an exergonic reaction
ATP cannot phosphorylate the protein
ATP can phosphorylate the protein
Q.9 :
The basic process that cells (eukaryotic or prokaryotic) use to obtain energy through glycolysis includes
oxidation of glucose to pyruvate
lactate fermentation
ethanol fermentation
all ove the above
Q.10 :
The very first reactions in glycolysis are characterized by
the loss of carbon dioxide
ATP production
ATP consumption
oxidation
Q.11 :
Which statement is correct?
Fermentation of pyruvate to lactic acid yields 2 moles of ATP
Glycolysis produces 2 moles of NAD+.
for every mole of glucose, two moles of glyceraldehyde 3-phosphate are produced
all of the are correct
Q12 :
During glycolysis for each molecule of glucose degraded to pyruvate
two molecules of NAD+ are formed
4 ATP molecules are produced ( two ATP are consumed)
one molecule of oxygen is consumed
none of the above
Q.13 :
The free energy released during glycolysis is
contained in carbon dioxide
harvested in form of NADH and ATP
lost as heat.
stored in form of lactic acid.
all of the above
Q.14 :
The enzyme phosphofructokinase is
activated by ATP since ATP is needed to start glycolysis
inhibited by high ADP concentration
inhibited by high ATP concentration
always active since the cell metabolism does not stop
Q.15 :
What is substrate phosphorylation ?
phosphorylation of a compound by ATP
phosphate is produced in a metabolic reaction
phosphate is lost in a hydrolysis reaction
a phosphate is transferred to ADP from a substance