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BIOD 171 Portage Learning Exam 2 Questions And 100% Correct Answers
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BIOD 171 Portage Learning Exam 2 Questions And100% Correct Answers
What is cellular metabolism? - ANSWER Cellular metabolism involves a set of
biochemical reactions that occur in living organisms to sustain life.
What is the primary function of enzymes and how are they controlled? - ANSWER
Enzymes speed up the rate of chemical reaction and it is controlled by a co factor.
What is the difference between catabolism and anabolism? - 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. -
ANSWER ATP has the energy to DONATE while ADP has the capacity to ACCEPT
energy.
Chemotrophs can be subdivided into what two subgroups? - 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? - 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 glucose catabolism? - ANSWER Glycolsis is the
, first step and gives 2 molecules of ATP.
Fermentation or respiration, up to 2 additional molecules of ATP can be produced.
Finally, the electron transport chain makes 34 ATP via oxidative phosphorylation event
at the plasma membrane.
What are the reactants of glycolysis? - ANSWER The reactants are any molecules
present and involved at the beginning of the process 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 major stratagies for restoring cellular concnetrations of NAD+ and under
what conditions are these stratagies employed? - ANSWER The two major stratagies
that the cell uses for reconverting NADH to NAD+ are fermentation and respiration.
Fermentation takes place in the absence of oxygen and respiration in the presence of
oxygen.
Respiration is more productive than fermentation.
How does the TCA and ETC interrelate? - ANSWER The end products of the TCA (Krebs)
are used to feed into the ETC (electron transport chain).
The TCA makes reduced electron carriers and it feeds into the ETC.
In the absence of sugars, are completely different metabolic pathways used to process
alternative sugar sources (fructose or lactose?) - ANSWER No.
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