14. Elongation of newly synthesized tubulin fragments occurs in what direction?
ID: 272730 • Letter: 1
Question
14. Elongation of newly synthesized tubulin fragments occurs in what direction? A. Negative -) B. Neutral C. Positive (+) D. All of the above 15. Elements of the cytoskeletal network (Intermediate filaments, Actin, Microtubules) are what type of macromolecules? A. Proteins B. Lipids C. Carbohydrates D. Nucleotides 16. You are engineering a new protein (protein Y) and you forgot to include a signaling peptide. What will you expect to happen? A. The protein will be ejected from the cell B. The protein will remain in the cytosol C. The protein will be deposited in the golgi for export D. The protein will be degraded 17. As you try to correct the mistake you made in the above question, you removed th R signal sequence from "protein X" and added it you your protein. What would be xpected to happen to protein X and your protein (protein Y)? A. Protein X will go to the cytosol while protein Y will go to the ER B. Protein X will go to the nucleus while protein Y will go to the ER C. Protein X will go to the ER while Protein Y will go to the ER . Protein X will go the the cytosol while protein Y will go to the cytosol Oynamic Instability" refers to which of the following? The ability of actin to add new actin monomer to a growing actin filaments The ability of microtubules to switch back and forth between polymerization an depolymerization The ability of microtubules to use ATP to elongate in any directionExplanation / Answer
Solutions
14. The correct answer is option C- positive (+)
Tubulin polymerizes by the association of beta-subunit of one dimer with the alpha-subunit of the next dimer. While elongation can happen at both ends, it is more rapid at the positive(+) end.
15. The correct answer is option A – Proteins
All the components of the cytoskeletal assembly are made of monomers of globular proteins, and form the structural backbone of the cell.
16. The correct answer is option B – the protein will remain in the cytosol.
The signal peptide is a hydrophobic stretch of 15-25 amino acids that are present in newly synthesized proteins, and help them to attach to the ER. Without the signal peptide, the newly synthesized proteins would remain in the cytosol, without ever getting functional.
17. The correct answer is option A - Protein X will go to the cytosol, and protein Y will go to the ER.
18. The correct answer is option B - The ability of microtubules to switch back and forth between polymerization and depolymerization.
The main driver of dynamic instability is the hydrolysis of GTP which alters the conformation of the tubulin molecules
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.