The following question came from the Mastering Biology homew…

The following question came from the Mastering Biology homework. Which one of the following statements about the redox reactions of the electron transport chain is correct?(a) The oxidation of NADH is directly coupled to the reduction of oxygen to water.(b) The electron transport chain takes electrons from water and gives them to oxygen.(c) The redox reactions of the electron transport chain are directly coupled to the movement of protons across a membrane.(d) NADH gains electrons in the initial reaction of the electron transport chain.(e) The redox reactions of the electron transport chain are directly coupled with the synthesis of ATP. Explain why (e) is incorrect.  (Note: Merely stating the negative of the answer choice will not earn points as you must adequately explain/defend your answer to demonstrate that you truly understand the material.)

Keep  In the illustration below, “original” (template) DNA p…

Keep  In the illustration below, “original” (template) DNA polynucleotides are yellow, “new” (copy) DNA polynucleotides are blue.  The 3 DNA molecules in the top row show polynucleotide composition before replication.  The DNA molecules in the bottom row show polynucleotide composition after replication.  Which one of the lettered illustrations correctly shows the semiconservative model of DNA replication?  

Keep.  Below are several representations of messenger RNA. …

Keep.  Below are several representations of messenger RNA.  Rather than type out nitrogenous bases I am, representing sequences with the words Intron or Exon to indicate whether that particular segment of mRNA is an intron or an exon.  Which representation shows an mRNA molecule after processing (all steps of mRNA processing have taken place).