LIFESCI 2 Midterm: LS Midterm 1 Practice Questions & Answers

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University of California - Los Angeles
Life Sciences

LS Midterm 1 Practice Q’s Joseph Esdin 1. The special property that allows ice is float is primarily by which type of interaction? a. Hydrogen bonding 2. Catabolic reactions that break down macromolecules are called: a. Hydrolysis reactions 3. Amino acids exist in which form at physiological pH? a. Neutral zwitterion 4. Pepsin, an enzyme which digests proteins in your food, preferentially recognizes bonds between hydrophobic amino acids. Which structure is most important in the action of pepsin? a. Primary bonds 5. Cell membranes are primarily composed of which type of lipids? a. Phophsolipids 6. The golgi body is an organelle that is important in determining whether proteins made in the cell will be used or secreted. The golgi body directs the movements of proteins by using a(n): a. Lipid marker 7. What is found in the RNA but not DNA? a. None of the above 8. A gene is undergoing transcription. The template strange has the following sequence: AAGTATTCGATA a. UUCGAUAAGCUAU 9. What type of RA is not involved in translation? a. All are involved 10. In the kidneys, it is important that the molecules of urine do not leak out the tubules transporting them to the bladder. You would expect the cells of the tubules to be connected by: a. Tight junctions 11. Ion channels are proteins in the membrane of cells that provide a hydrophilic tunnel from the outside of the cell membrane to the inside. From this we can conclude that the ion channels are: a. Integral transmembrane proteins 1 12. In hospitals, salt is added to IV lines to ensure that the IV fluid does not damage the cells circulating the veins. The salt is to make the solution: a. Isotonic 13. Estrogen is a small, nonpolar hormone that is produced in female ovaries. Which is the best answer that explains the movement of estrogen into its target cells? a. Moves directly through membranes 14. Determine the electrochemical potential and the direction of a chlorine ion if the equilibrium potential for children was -50mV and the resting membrane potential was +20mV. a. -30mV, into the cell 15. What level of protein structure is represented by your completed GFP model? a. Tertiary 16. What level of protein structure is represented by the arrows printed on your GFP model? a. Secondary 17. In your model, you used tape to connect neighboring beta strands. In real protein, what kind of interaction holds these strands together? a. Hydrogen Bonds 18. Altering the secondary structure of GFP would not be likely to affect its activity a. False 19. Which of the following lipids could assemble into a bilayer or micelle in an aqueous solution? a. Lipid a and lipid c 20. Which part of the phospholipid could interact with a carbohydrate? 2 a. Hydrophilic head (Carbohydrates are hydrophilic) 21. Which part of the phospholipid could interact with a protein? a. It depends on the protein 22. Which type of cell do you expect to contain the greatest number of lysosomes? (Between Phagocytes, Red blood cells and B cells) a. Phagocytes 23. Which cell type do you expect to have the least number of mitochondria? a. Red blood cells (They passively transport O2) 24. Insulin is a secreted protein. Based on this information, where do you expect insulin to be synthesized? a. Rough ER (Proteins enter the endomembrane system at the rough ER 25. Insulin is a secreted protein. Which of the following described what you would expect to observe in cells treated with a drug that inhibits transport vesicle formation?
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