Which factor can cause an enzyme to denature?

Which of the following statements is true regarding the movement of substances across cell membranes?

1. Click on Honorlock 1.3 in the menu to launch your Test 1 Chapters 6 and 7 2. During your room scan, be sure to scan 360 degrees around the room AND tilt your camera or laptop, so that I can see your entire tabletop or desk area where you will be taking your test. Failure to complete these requirements will result in a zero on your Test 1. 3. On camera, turn off your cell phone and place it at least 6 feet away from your work area. Failure to complete this requirement will result in a zero on your Test 1. 4. Be sure that your camera shows your entire upper body during the test. Placing your laptop on books or something higher than your table top  and slightly tilting your screen downward will help me to see your work area. Forehead or ceiling is not acceptable and will result in a zero. 5. You cannot take your test in bed or partially clothed. This will result in a zero on the test. 6. I will put an optional zero point assignment in the Module, so that you can upload your handwritten work for partial credit. I also give bonus points for exceptional work. 7. You are allowed to use a calculator, plain or graph paper for handwritten work, and up to a 5 X 7 notecard for the test.  8. I have also allowed Demos.com/calculator as a website you can access. I hope that it works! I have read and understand these requirements and intend to follow them for Test 1.

Alcohol dehydrogenase (ADH) is an enzyme that aids in the decomposition of ethyl alcohol into nontoxic substances.  Methyl alcohol acts as a competitive inhibitor of ethyl alcohol by competing for the same active site on ADH.  When attached to ADH, methyl alcohol is converted to formaldehyde, which is toxic in the body.   Which of the following statements best predicts the effect of increasing the concentration of substrate (ethyl alcohol), while keeping the concentration of the inhibitor (methyl alcohol) constant?

A sample of human blood was placed in a test tube containing a physiological saline solution (0.9% sodium chloride). This type of solution is often used intravenously to quickly rehydrate patients. A drop of the blood from the test tube was placed on a slide and red blood cells (RBCs) were observed under a microscope. Three possible outcomes are diagrammed below.     Which of the following best predicts which diagrammed microscope view the laboratory worker would see and best explains why?

Where does the initial assembly of proteins occur?

To study the actions of the enzyme catalase on hydrogen peroxide, students performed the following experiment.  Catalase was extracted from potatoes by blending raw potatoes in a blender with cold distilled water.  The filtrate was stored on ice.  The following hydrogen peroxide solutions were made: 1 %, 5%, 10%, and 15%. Filter paper disks were soaked in the catalase filtrate and dropped into beakers containing the various solutions.  The activity of the enzyme was measured by the amount of time it took for the disks to float to the surface of the solution on the bubbles produced by the reaction.  The following data were obtained. Time it takes for disks to float in different Hydrogen Peroxide concentrations Hydrogen Peroxide Solution Average Time, in seconds, for disks to float 1% 30 sec 5% 25 sec 10% 20 sec 15% 10 sec Which of the following experimental designs should the students use as a control for the experiment?

When a substance moves across the plasma membrane along a concentration gradient (high to low) at a rate faster than would be expected by simple diffusion alone but without the expenditure of metabolic energy, the process is best described as

The following questions refer to an experiment in which a dialysis-tubing bag is filled with a mixture of 3% starch and 3% glucose and placed in a beaker of distilled water, as shown below. After 3 hours, glucose can be detected in the water outside the dialysis-tubing bag, but starch cannot.     If, instead of the bag, a potato slice were placed in the beaker of distilled water, which of the following would be true of the potato slice?

What type of bond is shown?