Practice Midterm I A

Practice Midterm I A - Name: ID# A Midterm I MCDB 165A FALL...

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Name: ID# A Midterm I MCDB 165A – FALL 2005 BIOLOGY OF THE CELL MATERIAL: LECTURES 1-5 PAPER: "PARTITIONING OF LIPID-MODIFIED MONOMERIC GFPS INTO MEMBRANE MICRODOMAINS OF LIVE CELLS" ZACHARIAS, VIOLIN, NEWTON, TSIEN. SCIENCE 2002. NAME:_______________________________________________________________ UCLA ID NUMBER:___________________________________________________
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Name: ID#: 1 TRUE OR FALSE (10 points) ____1. Kinks found in lipid structures in the plasma membrane are generated as a result of unsaturated hydrophobic tails. ____2. The receptors involved in paracrine, synaptic, and endocrine signaling all have very high affinity for their respective signaling molecules. ____3. There are multiple isoforms of fibronectin. One, called plasma fibronectin, is soluble and circulates in the blood and other body fluids. ____4. The development of confocal microscopy has significantly enhanced our ability to clearly visualize thick specimens and generate 3-D reconstructions. ____5 . Activation of G-proteins following G-protein-coupled receptor activation requires ATP hydrolysis. ____6. IgSF-IgSF interactions are calcium-dependent. _ __7. Tight junctions are abundant in epithelial sheets such as that of the collector tube of kidney and intestinal epithelia. They prevent the passage of molecules from and to the lumen. ____8. Laminin and type II collagen are abundant components of the basement membrane. ____9. Not all signaling events require receptors. ____10 . The phase contrast microscope exploits the diffracting properties of the cells. Thus it is frequently used to examine live cells.
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Name: ID#: 2 MULTIPLE CHOICE (20 points) 11- At lower temperatures an eucaryotic cell can ______________ a) increase double bonds in lipids of the phospholipids and increase cholesterol b) only increase cholesterol c) decrease double bonds in lipids of the phospholipids and decrease cholesterol d) only decrease cholesterol e) None of the above 12- In fibrillar collagens, proline hydroxylation is a common modification. The hydroxyl groups of these amino acids are thought to form interchain hydrogen bonds that help
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Practice Midterm I A - Name: ID# A Midterm I MCDB 165A FALL...

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