W23 d103 Study guides, Class notes & Summaries

In an in vitro polymerization reaction of F-actin from its G-actinsubunits, there is a lag phase. What happens during this lag phase? A: F-actin is nucleated. B: F-actin reaches a steady state C: F-actin exchanges nucleotides D: F-actin hydrolyzes ATP E: F-actin undergoes treadmilling - ANSWER A: F-actin is nucleated. 3. How would you test whetheractin cytoskeleton promotes mitochondria fissionprocess? A: Prevent F-actin assembly and examine mitochondria dynamics by monitoring a GFP...

1. Which of the following factors is NOT a component of the extracellular matrix (ECM)? A: Keratin B: Collagen C: Fibronectin D: Fibroblasts E: Proteoglycans - ANSWER A. Keratin 2. Which feature is shared between adherenjunctions and desmosomes? A: Both needs Ca2+to function B: Both connect the intermediate filaments of neighboring cells C: Both only contain cadherin andcytoskeleton D: Both promote cell migration E: Both have outside-in and inside-out signaling - ANSWER A: Both...

14. The growth rates at the plus and minus ends of actin filaments as a function of actin concentation are shown. At which point (marked by a letter) does F-actin a. Shrink at both ends? A b. Treadmill? C c. Grow at the plus end and stay constant at the minus end? D - ANSWER At each point, try to determine what will happen to a specific end of an actin filament, with the Y=0 determining whether a filament growth (>0) or shrinks ((>0) Eg at point A (which refers to cytosolic concen...