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  Which of the following statements correctly describes the structure of chromatin?  

  In DNA replication, which enzyme catalyzes the elongation (i.e. addition of nucleotides to only the 3’ end) of a new DNA strand growing in the 5′ → 3′ direction?  

  As adults, we’re made up of trillions of cells and hundreds of different types of cells doing wildly different jobs in the body…. think how!  Muscle cells differ from nerve cells mainly because they ________.  

  What is the role of DNA ligase in the elongation of the lagging strand during DNA replication?  

The following question refers to this table of codons.   What amino acid sequence will be generated based on the following mRNA codon sequence?   5′-AUG-UCU-UCG-UUA-UCC-UUG-3′

  YOU GOT THIS!!!! Put the following terms in the correct sequence of levels according to the biological hierarchy.  NOTE:  BIOSPHERE is at the top and ATOM placed at the bottom!!!!  

  How does the initial primary transcript (= pre-mRNA) in the nucleus of a eukaryotic cell compare to the functional mRNA that leaves the nucleus?  

  Given our current insight into what is happening at the molecular level… instead of the BIO103 ambiguous “unit of inheritance” definition for gene, which of the following statements is a BETTER description of a gene?  

  Regulation of gene expression is primarily done at the pre-transcriptional (i.e. chromatin modification) and/or transcriptional level.   Post-transcriptional mechanisms typically only play “supporting” roles.  

              When Thomas Hunt Morgan crossed red-eyed F1 generation flies to each other, the F2 generation included both red- and white-eyed flies, but all the white-eyed flies were male.  Which of these best explains Morgan’s result?