You want to create an ELISA to detect the presence of a specific pathogen in a sample. Which of the following options best describes how you could obtain a primary antibody?

You want to determine the rate of diffusion of a substance across the plasma membrane. Which of the following statements is/are correct about this experiment?

From the molecules listed below, [option1] penetrates the plasma membrane the fastest, while [option2] crosses it the slowest.

If you exposed onion epidermal cells to solutions of each of the alcohols shown below, which of them will cause the most plasmolysis?

During the cellular respiration laboratories, you used differential centrifugation to isolate different cellular fractions. How did you determine the purity of your mitochondrial and non-mitochondrial fraction and why?

By now, you have used various containers and have measured different volumes of liquid using different tools.  It’s important not only to follow protocols but also to develop a sense of what different volumes look like and which containers are appropriate for each amount. You are following a lab protocol that requires you to measure 0.5 mL of liquid. Based on what you’ve seen and used in lab, which of the following images best represents 0.5 mL of liquid?   

Consider the titration of 40.0 mL of 0.060 M weak base with 0.035 M strong acid (assume a 1:1 mole ratio of acid:base). Calculate the pH after 66.0 mL of strong acid has been added. The Kb of the weak base is 4.75 x 10-6.

What is the location of the most negative shear force in the beam? Report your answer in units of meters as measured from point A.

If bar AB has a square hole that can freely slide up-and-down on a smooth square post, but is held in static equilibrium by cable BC while subjected to a force F as shown, what is the tension in cable BC? Report your answer in units of lbs. knowing that

Other than point B, where else along the beam is the shear force of the beam exactly zero? Report your answer in units of meters, as measured from point A.