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2) What two cytoskeletal proteins are found in the lammelipodia of axon growth cones? Show transcribed...
List the two major motility systems and eukaryotic cells. Name the cytoskeletal elements and motor proteins associated with each.
1. What channels or carriers are NOT found at the axon to the axon terminal? Select one: a. Na+ leaky channels b. Cl- gated channels c. Na+ gated channels d. Na+-K+ ATPase e. None of the above 2. What is TRUE about action potential in the neuron? There may be more than one answer. Select one or more: a. At resting membrane potential (-70mV), the inactivation gate of the Na+ channel is closed while the activation gate is opened. b....
1) What is nucleation? How are microtubules nucleated? How is Actin commonly nucleated? 2) How do motor proteins work? Why is it important that these proteins have two domains that interact with the cytoskeletal element (“feet”)? 3) Give two examples of Actin binding proteins that would affect actin dynamics. 4) Intermediate filaments are very different from the other two cytoskeletal elements. What are those differences?
6|EXAM 2 44. The giant axon found innervating the muscle of the squid mantle is able to rapidly transmit nervous stimuli due to the fact that it A. has a higher than normal concentration of voltage gated Na+ and K+ channels in its axon B. has a larger diameter than most neurons, increasing the transmission rate of the signal C. has a higher concentration of Na'/ K pumps, allowing for increased rates of recovery from each stimulus event D.both b...
Which cytoskeletal element is being described? Answer with the letter corresponding to the element: M. Microtubules A. Actin filaments IF. Intermediate filaments 1. Formation requires nucleation at a centrosome 1 2. Forms the contractile ring during cytoplasmic division (cytokinesis) 2 3. Found organized in a characteristic 9+2 arrangement in cilia and flagella 3 4. Examples include keratin and neurofilaments, which are important in the mechanical strength of skin and axons 4 5. Involved cellular crawling such as seen with white...
While investigating the function of a specific growth factor receptor gene from humans, researchers found that two types of proteins are synthesized from this gene. A larger protein containing a membrane-spanning domain recognizes growth factors at the cell surface, stimulating a specific downstream signaling pathway. In contrast, a related, smaller protein is secreted from the cell and binds available growth factor circulating in the blood, thus inhibiting the downstream signaling pathway. Speculate on how the cell synthesizes these disparate proteins.
12. Individual cytoskeletal filaments are typically organized into more complex structures within the cytosol. What two general types of structures do individual filaments combine to form in the cytosol? How are these structures created and maintained?
Using the two figures what can you conclude about the offspring and growth pattern in plants and animals? Thank you! Relative width of annual rings (mm) OTTO 2 20 22 6 10 12 14 16 18 Mean number of cones per tree (x102) Absolute fecundity (Number of oocytes x 10 ) •:. S . 0.03 0.04 0.05 0.06 0.07 Specific growth rate (mm) 0.08 0.0
1)List 3 proteins found in hen egg white and state their functions 2)Will brown egg white have the same protein composition as white egg white? Provide suitable justifications for your answer. 3) What is size exclusion chromatography? How does it separate small vs large proteins?
1. What are the two proteins that form “spikes” on the surface of influenza virus? 2. In influenza, transcription of mRNAs and replication of the genome are carried out by what enzyme? Is this a cellular enzyme, or a viral enzyme?