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Which of the following branches of the aorta is most superior in the body?

In this axial CT of the abdomen, the indicated structures most likely represent:  

Which structure is retroperitoneal?

The common iliac artery bifurcates into the internal and external iliac artery at approximately the level of the…

Which of the following best describes the function of gap junctions in cell communication?

During intense exercise, lactic acid builds up in muscle cells, lowering the pH of the surrounding tissue. Which of the following best describes how a buffer in the bloodstream helps maintain pH homeostasis in this situation?

A scientist measures the pH of three different solutions: Solution A has a pH of 3, Solution B has a pH of 7, and Solution C has a pH of 10. Based on these pH values, which of the following statements is correct?

Which of the following correctly describes the roles of the capsid, envelope, and viral genome in a virus?

A scientist is studying how different diets affect the weight gain of lab mice. The scientist provides three groups of mice with different types of food: Group 1 receives a high-protein diet, Group 2 receives a high-fat diet, and Group 3 receives a standard diet. After four weeks, the scientist measures the weight of the mice. Identify the independent variable and the dependent variable in this experiment. (2 points) Suggest 2 elements of the experiment that should be controlled to make sure the diet is the only factor affecting weight gain. (3 points)  

Consider the diagram below of a cell membrane. Identify each of the marked components of the membrane: A: [a] B: [b] C: [c] D: [d] Note: I will grade this question manually in case there are alternate correct answers or spelling errors.