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During a pulse-chase experiment, cells are briefly exposed to radioactive amino acids (pulse), followed by a period in non-radioactive medium (chase).  Which of the following statements correctly describe what may happen as the chase period increases? (Select all that apply)

You are given two unlabeled tissue samples, one coming from a patient with metastatic cancer and one from a healthy patient. You are asked to differentiate between both samples, but are only given reagents to measure the expression of two types of genes. Which of the following genes would you choose?

The features of a transmembrane protein are presented below. The boxes represent membrane-spanning segments, rich in nonpolar amino acids and the (+) and (-) signs are the charge of the polar amino acids flanking the first segment. Which of the following options (Fig A to Fig F) correctly represent how the mature protein would be arranged across the ER membrane?

Idiopathic pulmonary fibrosis is a progressive lung disease causing build-up of scar tissue on the alveoli causing difficulties with breathing and with gas exchange with the bloodstream. What component of the ECM could cause heavy scar tissue formation?

Remember that the cellular processes we talked about are found at the end of the exam. Some of them are also included as part of the questions.

Which of the following features or characteristics would you expect will be present or associated with selectins? Select all that apply

Cell adhesion can often be blocked in vitro by treating cells with specific agents. Which of the following interactions would you expect would be affected if B. You treated cells with EGTA, which binds (sequesters) Ca++

Which of the following statements about the extracellular matrix (ECM) is false?  

Provide an appropriate response.The mean age of bus drivers in Chicago is 46.4 years. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?

Solve the problem.The annual precipitation for one city is normally distributed with a mean of 309 inches and a standard deviation of 2.8 inches. Fill in the blanks.In 95% of years, precipitation in this city is between and inches.