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Cell bio test 4 - Principles of Cell Biology Exam 4...

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Principles of Cell Biology Exam 4 May 16, 2006 Directions : There are 75 questions in this exam with only one correct answer for each question. All answers are to be placed on the grid sheet . Don’t forget to enter your name and last 4 numbers of your social security number in the appropriate places on your answer sheet . 1. What is the function of thymosin β 4? a. It caps F-actin at the - end b. It sequesters ATP-bound G-actin and, as such, increases the G-actin cytoplasmic reserves c. It facilitates ATP/ADP exchange associated with G-actin d. It caps microtubules but only at the + end e. It is an F-actin severing protein 2. Which of the following defective proteins can contribute to the conversion of a normal to a cancer cell? a. Growth factors b. Growth factor receptors c. Intracellular transducers d. DNA repair proteins e. All of the above proteins can contribute to the conversion of a normal to a cancer cell if they are defective. 3. Which of the following is regarded as the “guardian of the genome”? 4. The multi-hit model of cancer states that oncogenes can 5. Asymmetric division is best represented by :
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6. An increase in Cyclin B levels occurs just prior to what cell cycle phase? a. G 1 b. S c. G 2 d. M e. G 0 7. The erbB oncogene is most related to which receptor? 8. Of the following cancers, which has the steepest slope of incidence over the lifetime of an individual? 9. Which of the following cell types is anucleate (does not contain a nucleus)? 10. Many new drugs are currently being used or developed as anti-cancer drugs because they attack tumor-driven angiogenesis. What is angiogenesis? a. Mutation of p53 b. Formation of new blood vessels c. Mutation of ras d. Over-expression of oncoprotein receptors on tumor cells e. The ability of cancer cells to “skip” G 2 so that they can divide faster.
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