Question

in addition to observing red blood cells under the microscope, we will also do which of the following to tubes containing blood?
a) hold the tubes to a flame
b) hold the tubes up to light to see if light penetrates the tube
c) hold the tubes up to print to see if we can read the print through the liquid
d) place the tubes in a spectrophotometer to measure absorbance

Explanation:

In a laboratory - setting for blood analysis, a common procedure is to measure the absorbance of blood using a spectrophotometer to determine various parameters such as hemoglobin concentration. Holding tubes to a flame is dangerous and not a standard procedure. Holding tubes up to light or print is a very rudimentary and inaccurate way compared to using a spectrophotometer.

Answer:

D. place the tubes in a spectrophotometer to measure absorbance