Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He found that the largest groups were found in the areas illuminated by the red and blue light. What would you predict would happen if you ran the same experiment without passing light through a prism?

Use the image below to match the structures to their descriptions or functions. Each answer is used once. 

Facilitated diffusion can occur through a _________ protein, which fits molecules of a specific structure, causing the protein to change its shape, moving it across the plasma membrane and releasing it on the other side. Facilitated diffusion can also occur through a ___________ protein, which creates a tunnel through the plasma membrane.

Please answer ONE of the two questions below. If you answer both, I will only grade the first question answered. Please indicate which question you are answering.  1. Explain how the structure of the plasma membrane allows for it to be selectively permeable. How does the chemical structure of both integral and peripheral proteins predict their arrangement within the plasma membrane? 2. What are the three stages of cell signaling? Describe the cell-singaling processes that occur when the ligand is polar versus nonpolar. 

Which of the folowing items was partially the result of the federal government’s role of providing subsidies, maintaining free trade between the states, and adopting a laissez-faire approach to the national economy?

The password for your online exam is: icecreamThe link for the online exam is in the Step 1 folder; you should have opened it in a new tab before you begin this test.Instructions:Before you begin your exam, hold up all sheets of paper you will be using to the camera to show that there is nothing written on it. If your instructor allows the use of formula sheets or a handheld calculator, please hold these up to the camera as well.Enter the password found above into the online exam tab open in Step 1 and complete the exam. Once completed, hold up each completed sheet of paper to the camera.Answer the Yes/No question below and proceed to the next question.DO NOT SUBMIT OR CLOSE YOUR TEST before answering all the questions.Question:I have completed and submitted my online exam, and I have held up all my sheets of paper (front and back) to record an image of them on the camera.

A fluid becomes thicker when heat is removed. What property has changed?

An operator is comparing 2 crude oils: Oil X: 25° API    Oil Y: 40° API (the degree sign is the sign for API, not temperature) Which of these statements is correct? (Water has an API Gravity of 10)

Why are light hydrocarbons stored under pressure?

The password for your online exam is: icecreamThe link for the online exam is in the Step 1 folder; you should have opened it in a new tab before you begin this test.Instructions:Before you begin your exam, hold up all sheets of paper you will be using to the camera to show that there is nothing written on them. If your instructor allows the use of formula sheets or a handheld calculator, please hold these up to the camera as well.Enter the password found above into the online exam tab open in Step 1 and complete the exam. Once completed, hold up each completed sheet of paper to the camera.Answer the Yes/No question below and proceed to the next question.DO NOT SUBMIT OR CLOSE YOUR TEST before answering all the questions.Question:I have completed and submitted my online exam, and I have held up all my sheets of paper (front and back) to record an image of them with the camera.