Answers_to_practice_questions_Ch17 - Answers to the chapter...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Answers to the chapter 17 sample questions 1. (A) actin (B) microtubules (C) intermediate filaments 2. c 3. A. actin B. intermediate filaments C. actin D. intermediate filaments E. microtubules F. microtubules G. microtubules H. intermediate filaments I. actin J. actin 4. d 5. d 6. keratin, desmosomes, vimentin, neurofilament, plectin 7. lamins ____ C ____ neurofilaments ____ A ____ vimentins ____ D ____ keratins ____ B ____ 8. Cells should become arrested in mitosis. Normally, the lamins are phosphorylated during mitosis, causing disassembly of the nuclear envelope. At the end of mitosis, the nuclear lamins are dephosphorylated, causing the lamins to reassemble. Inhibition of this last step should therefore prevent the nuclear lamins from reassembling after mitosis. 9. d 10. C, D, A, B, E 11. a 12. beta-tubulin, alpha-tubulin, thirteen, gamma tubulin, centrosome, GTP, basal body, nine, dynein 13. d 14. c 15. A. The newly exposed microtubule plus ends will shrink if you sever the microtubules in the middle. This is because a microtubule grows by adding GTP- carrying subunits to the plus end. The GTP is hydrolyzed over time, leaving only a cap of GTP-carrying subunits at the plus end with the remainder of the tubulin protofilament containing GDP-carrying subunits. Therefore, if you sever a growing microtubule in its middle, you will create a plus end that contains GDP- carrying subunits. The GDP-carrying subunits are less tightly bound than the GTP-carrying...
View Full Document

Page1 / 3

Answers_to_practice_questions_Ch17 - Answers to the chapter...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online