Which of the following is true about the structure of the microtubule wall?
A) ?-?-tubulin heterodimers are arranged with mixed orientation in each protofilament, and protofilaments are arranged with mixed polarity in the microtubule wall.
B) ?-?-tubulin heterodimers are arranged with the same orientation in each protofilament, and protofilaments are arranged with mixed polarity in the microtubule wall.
C) ?-?-tubulin heterodimers are arranged with the mixed orientation in each protofilament, and protofilaments are arranged with same polarity in the microtubule wall.
D) ?-?-tubulin heterodimers are arranged with the same orientation in each protofilament, and protofilaments are arranged with same polarity in the microtubule wall.
E) Orientation of the ?-?-tubulin heterodimers is completely random and depends on which end of the dimer first hits the end of the microtubule when it assembles.
Answer: D
You might also like to view...
How many chromosomes would be found in the karyotype of a Down syndrome female?
A. 47 B. 45 C. 46 D. 44
When constructing a genetic map of Zea mays, Creighton and McClintock used genetic markers as well as structural differences in the homologous copies of chromosome 9 that can be seen under the microscope
What are these structural differences called?
Cellular respiration in prokaryotic cells does not require oxygen. What is this process called?
A) aerobic B) prokaryotic C) heterotrophic D) anaerobic
Immunological attack on the islets of Langerhans resulting in the inability to produce insulin leads to type (I/II/IV) diabetes Mellitus
What will be an ideal response?