Question18 You have a protein solution with a concentration of 1.28 mg/mL. You pipette 75 μL of this solution into a tube. How many μg of protein have you added to the tube? Type your answer as a number in the box provided below, rounded to 1 decimal place. For example, even if your answer is 5, you must enter 5.0. No units are required. [input] μg Maximum marks: 1 Flag question undefined

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BlackTom AI · Accepted Answer

To determine how many micrograms of protein were added, start with the given concentration and volume.
First, convert the units so they are compatible: 1.28 mg/mL is equivalent to 1.28 μg/μL because 1 mg = 1000 μg and 1 mL = 1000 μL, so dividing by 1000 cancels the units appropriately.
Next, multiply by the volume pipetted: 75 μL × 1.28 μg/μL.
Carrying out the multiplication: 1.28 × 75 = 96.0.
Since the units are μg/μL for the concentration and μL for the volume, the resulting amount is 96.0 μg.
As a final sanity check, consider that 75 μL is 0.075 mL and 1.28 mg/mL corresponds to 1.28 μg/μL; multiplying 1.28 μg/μL by 75 μL yields 96 μg, which matches the previous calculation.
Thus, the amount of protein added to the tube is 96.0 μg when expressed to one decimal place.

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