19. Proteins that are fully translated in the cytosol and lack a signal sequence

Question

19. Proteins that are fully translated in the cytosol and lack a signal sequence in A. The cytosol B. The mitochondria C. The interior of the nucleus D. The nuclear membrane. will end up 20. Signal sequences that direct proteins to the correct compartment are A. B. C. Added to proteins through post-translational modification. Added to a protein by a protein translocator. Encoded in the amino acid sequence of the protein as it is translated 21. What is the role of the nuclear localization sequence in a nuclear protein? A. It binds to cytoplasmic proteins that direct the nuclear protein to nuclear pore. B. C. It aids in protein unfolding so that the protein can thread through nuclear D. It prevents the protein from diffusing out of the nucleus through nuclear It is a hydrophobic sequence that enables the protein to enter the nuclear membranes. pores. pores Directions for questions 22-24: Each description listed below is most closely associated with one of the following cell-surface receptor. Choose the best answer, A-C. Not all answers will be used! Alter the membrane potential directly by changing the permeability of the plasma membrane. Signal by opening and closing in a ligand-independent manner. All receptors of this class Include receptor tyrosine kinases. A. B. C. D. are proteins with seven transmembrane domains. 22. G-protein-coupled receptors 23. Ion-channel-coupled receptors 24, Enzyme-coupled receptors The cytoskeleton is made up of three types of protein filaments. The cytoskeleton controls the location of organelles in eukaryotic cells. The cytoskeleton of a cell is fixed and does not change. 25. Which of the following statements about the cytoskeleton is false? A. B. C.

Explanation / Answer

Q19:- Option A

Explanation:- proteins lacking signal sequence end up in cytosol as they cannot be directed to any cellular organelles.

Q20:- Option C

Explanation:- The signal sequence is added during translation of protein that is recognised by SRP ( signal recognition protein)

Q21:- Option A

Explanation:- NLS binds the cytoplasmic proteins that direct them into nucleus for example importin protein binds NLS that directs protein into nucleus.

Q22:-G protein receptors———Option C

Q23:-Ion channeled coupled receptors ——Option A

Q24:- Enzyme coupled receptors——- option D

Q25:- Option C

Explanation:- The false about cytoskeleton is it is fixed and does not change.

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