LS Midterm 1 Practice Q’s
1. The special property that allows ice is float is primarily by which type of
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?
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
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:
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
a. -30mV, into the cell
15. What level of protein structure is represented by your completed GFP model?
16. What level of protein structure is represented by the arrows printed on your GFP
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
19. Which of the following lipids could assemble into a bilayer or micelle in an
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)
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