White blood cells are capable of leaving the blood stream and following chemical trails to destroy microorganisms in our tissues.

Keep this one or the one above.  Assume the letters below represents a segment of nitrogenous bases on DNA.  Suppose this segment will function as a location where a primer will be placed. 3′  A  G  T  C  T  G  A  G  T  C  A  T  G  5′ In the space provided, write the base sequence of the primer.  

This white blood cell is responsible for causing inflammation at the site of tissue injury:

Keep.  Which two attachment or binding sites occur on transfer RNA (tRNA)?  Select two choices.

Keep.  Which one of the following best describes the limitation of the DNA polymerases that requires the use of primers during DNA replication?

Keep.  Which two of the following are functions of the components added to the primary RNA transcript during mRNA processing?

Identify the main muscle of respiration:

As the number of red blood cells increases, oxygen carrying capacity increases.

Keep.  Examine the diagram below.  This diagram shows two parental (“original” or “template”) DNA polynucleotide strands that have been separated.  These strands are labeled “upper parental/template strand” and “lower parental/template strand”.  An origin of replication is on the left-hand side of the diagram and is indicated by arrows.  The hatched boxes are primers.  I have lettered (in red) each primer “W”, “X”, Y”, or “Z” for reference.  Lastly, I have indicated the 3ʹ and 5ʹ ends of the parental DNA and of the primers.        a.  Which parental strand, the “upper strand” or the “lower strand”, will serve as the template for the leading strand during DNA replication?  How do you know?       b.  From which end of the primer and in which direction, “left-to-right” or “right-to-left”, will replication occur from the primer labeled X?  Explain your answer.

Keep.  Which one of the following does not occur during “processing” of the primary RNA transcript (pre-mRNA) following transcription (mRNA processing)?