BIOD 171 Portage Learning Exam 2
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What is cellular metabolism? - CORRECT ANSWER - Cellular metabolism is a set of
biochemical reactions that occur in living organisms to maintain life.
What is the primary function of enzymes and how are they regulated? - CORRECT
ANSWER - Enzymes speed up chemical reactions and they are regulated by a co factor.
What is the difference between catabolism and anabolism? - CORRECT ANSWER -
Catabolism is the breaking down of larger molecules into energy sources where anabolism is the
building up of macromolecules from smaller molecules.
ATP has the energy to _______ while ADP has the capacity to _________ energy. - CORRECT
ANSWER - ATP has the energy to DONATE while ADP has the capacity to ACCEPT
energy.
Chemotrophs can be subdivided into what two subgroups? - CORRECT ANSWER -
Chemotrophs can be divided by organotrophs and lithotrophs.
Organotrophs remove electrons from organic molecules such as glucose.
Lithographs remove electrons from inorganic molecules.
Chemotrophs utilize which form of phosphorylation? - CORRECT ANSWER -
Chemotrophs use oxidative phosphorylation. Oxidative phosphorylation utilizes the energy
released by the chemical oxidation of nutrients to reform ATP.
What are the three distinct stages in the catabolism of glucose? - CORRECT ANSWER -
Glycolsis is the first step and yields 2 molecules of ATP.
, Fermentation or respiration, 2 additional molecules of ATP can be produced.
Last, the electron transport chain produces 34 ATP via oxidative phosphorylation event at the
plasma membrane.
What are the reactants of glycolysis? - CORRECT ANSWER - The reactants are any
molecules present and involved at the beginning of glycolysis.
The reactants of glycolysis are glucose, NAD+ and ATP.
The reactants are everything located at the left of the arrow.
What are two main strategies for replenishing cellular concentrations of NAD+ and when are
these strategies utilized? - CORRECT ANSWER - Fermentation and respiration are the
two strategies used by cells to convert NADH back to NAD+.
Fermentation occurs when there is no oxygen and respiration occurs when there is oxygen.
Respiration is more efficient than fermentation.
How are the TCA and ETC related? - CORRECT ANSWER - The end products of TCA
(Krebs) are used to fuel the ETC (electron transport chain).
The TCA produces reduced electron carriers and it fuels the ETC.
In the absence of sugars, are entirely different metabolic pathways used to process alternative
sugar sources (fructose or lactose?) - CORRECT ANSWER - No.
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What is cellular metabolism? - CORRECT ANSWER - Cellular metabolism is a set of
biochemical reactions that occur in living organisms to maintain life.
What is the primary function of enzymes and how are they regulated? - CORRECT
ANSWER - Enzymes speed up chemical reactions and they are regulated by a co factor.
What is the difference between catabolism and anabolism? - CORRECT ANSWER -
Catabolism is the breaking down of larger molecules into energy sources where anabolism is the
building up of macromolecules from smaller molecules.
ATP has the energy to _______ while ADP has the capacity to _________ energy. - CORRECT
ANSWER - ATP has the energy to DONATE while ADP has the capacity to ACCEPT
energy.
Chemotrophs can be subdivided into what two subgroups? - CORRECT ANSWER -
Chemotrophs can be divided by organotrophs and lithotrophs.
Organotrophs remove electrons from organic molecules such as glucose.
Lithographs remove electrons from inorganic molecules.
Chemotrophs utilize which form of phosphorylation? - CORRECT ANSWER -
Chemotrophs use oxidative phosphorylation. Oxidative phosphorylation utilizes the energy
released by the chemical oxidation of nutrients to reform ATP.
What are the three distinct stages in the catabolism of glucose? - CORRECT ANSWER -
Glycolsis is the first step and yields 2 molecules of ATP.
, Fermentation or respiration, 2 additional molecules of ATP can be produced.
Last, the electron transport chain produces 34 ATP via oxidative phosphorylation event at the
plasma membrane.
What are the reactants of glycolysis? - CORRECT ANSWER - The reactants are any
molecules present and involved at the beginning of glycolysis.
The reactants of glycolysis are glucose, NAD+ and ATP.
The reactants are everything located at the left of the arrow.
What are two main strategies for replenishing cellular concentrations of NAD+ and when are
these strategies utilized? - CORRECT ANSWER - Fermentation and respiration are the
two strategies used by cells to convert NADH back to NAD+.
Fermentation occurs when there is no oxygen and respiration occurs when there is oxygen.
Respiration is more efficient than fermentation.
How are the TCA and ETC related? - CORRECT ANSWER - The end products of TCA
(Krebs) are used to fuel the ETC (electron transport chain).
The TCA produces reduced electron carriers and it fuels the ETC.
In the absence of sugars, are entirely different metabolic pathways used to process alternative
sugar sources (fructose or lactose?) - CORRECT ANSWER - No.
