1a.De novo synthesis of building blocks requires precursor metabolites CO2 fixat

Question

1a.De novo synthesis of building blocks requires
   precursor metabolites
   CO2 fixation
   nitrogen assimilation
   a AND b
   a AND c

1b.Only autotrophs use feeder pathways.
   True, because autotrophs do not use the central pathways
   True, because all carbon sources in heterotrophs directly enter glycolysis
   False, because autotrophs absorb carbon sources that enter glycolysis
   False, because heterotrophs can use carbon sources that cannot directly enter the central pathways

1c.Facilitated diffusion of solutes across the plasma membrane depends on
   a concentration gradient
   porins
   ATP
   a AND b
   a AND c

Explanation / Answer

1a. De novo synthesis encompasses the formation of complex molecules using the simple precursor molecules for example formation of protein from amino acid. Thus statement a is correct.

And there are few building blocks formation of which requires fixation of carbon dioxide such as glutamine. So option A and B are correct.

1b. Option D is the correct answer. As heterotrophs are able to convert food particles into the metabolites of central metabolism.

1c. In the process of facilitated diffusion , solutes move across the plasma membrane down their concentration gradient and no ATP are used in this process. So option A and B is the correct answer.

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