Which of the following nucleobases is a purine? Multiple answers are possible!

Indicate whether the protein in the images is binding in the major or minor groove as indicated by the arrows.

Consider the function .  Determine any extremums (minimums or maximums) along the axis 

Determine the x-component (cm) of the centroid of area as measured from the left edge of the section.  The dimension A= .  All dimensions are cm.  Enter your answer to 2 decimal places.

Rigid Body ABCD is pinned at joint A, has a roller at joint B, and an applied moment in the direction shown at D.  Use the following lengths (cm): a = , b = , c = , d =.  If M = Nm, determine the magnitude of the reaction force (N) at A.  Enter your answer to one decimal place.  

A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. Find the percentage of bulbs that can be expected to last the period of time. Round to the nearest hundredth, if necessary.Less than 460 hours

Determine the y-component (cm) of the centroid of area as measured from the bottom edge of the rectangle.  The dimension A = .  All dimensions are cm.  Enter your answer to 2 decimal places.  

Two stars of masses and are separated by a distance Determine the distance (measured from ) to a point at which the net gravitational force on a third mass would be zero.

Truss ABCD is simply supported at joints A and C.  Force F = N and acts downward at joint D.  Length AB = BC = m and length BD = m.  Determine the magnitude of the force (N) acting in member AB.  Enter your answer to 1 decimal place.

Which of the following statements about promoter structure are TRUE? Multiple answers are possible!