Tutor profile: Sean W.
Why do some steps of gluconeogenesis such as turning pyruvate back into phosphoenolpyruvate (PEP) require more than one step when the reverse reaction in glycolysis requires just one?
The answer to this is all about the energetics of the molecules themselves. Pyruvate is a much lower energy, or more stable compound then phosphoenolpyruvate. Because of this, in glycolysis (PEP) --> pyruvate is a very quick reaction and releases a lot of energy. However, going from a more stable compound to a less stable one (such as in gluconeogenesis) is unfavorable and requires an input of energy.
Subject: Basic Chemistry
What is the electron configuration of iron (Fe)?
The full electron configuration would be 1s2 2s2 2p6 3s2 3p6 4s2 3d6. The shortened configuration would use the noble gas prior to the element, in this case it would be [Ar] 4s2 3p6.
What are the components of a viral particle?
Viral particles contain genetic material, DNA or RNA, a protein coat called the capsid, and an envelope. Some types, such as bacteriophages have a tail sheath and tail fibers.
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