BIO 121 Lab Exam 1

To what number would you pull your solution to transfer 2ml in this pipette?

• 4

• 3

• 2

• 1

What is the solution called that is used to calibrate a spectrophotometer?

• Substrate

• Solvent blank

• Solute

• Solution

Which letter represents the button you would push to calibrate a spectrophotometer?

• A

• E

• C

• D

Given that a serial dilution was performed as shown in the picture and the concentration of the stock solution is 50mM, what is the concentration of the 3rd test tube?

• 100

• 25

• 12.5

• 6.25

Tags

NGSS.HS-PS1-7

A solution consists of a ______ dissolved into a solvent.

Transmittance is a linear function of concentration.

• True

• False

• Only on Wednesdays

• Absorbance

If the stock solution is test tube #1, and the test tube at the end on the right is #6, which test tube would have the greatest reading for %Transmittance after the serial dilution was completed?

• 1

• 2

• 5

• 6

Tags

NGSS.HS-PS1-5

If test tube #1 is the stock solution and the test tube at the end on the right is #6, which test tube would have the highest Absorbance reading after the completion of the serial dilution?

• 1

• 2

• 5

• 6

Tags

NGSS.HS-PS1-5

As the value for %T increases, what happens the value of absorbance?

• stays the same

• increases

• decreases

What happens to %Transmittance readings as concentration increases?

• increase

• decrease

• stay the same

Tags

NGSS.HS-PS1-5